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Printable House Cleaning Lists

August 13, 2010 by stain remover expert No Comments »

printable house cleaning lists

Parenting Questions and Answers

Does anyone else think this section went down the tubes?
As cheesy as it sounds, this section should be applied full of laughter, friendship, jokes, tips and vertical … What happened? Trolls and cranky took over and the people deeply fun getting enough of it and left. I'm pretty new to this whole entry, but there some nights when …

Does anyone enjoy "Distributel phone home" and Internet service?
I saw a flyer today and I was wondering if anyone has this service and how is it? What do you think of this? Ps I ask here because I know that many of you moms donate good answers and I wonder if you have it. Yes, I …

Nobody enjoyed the first pediatric hand wisdom about time?
Have you or your brother or your child has a pediatric stroke? Please answer these questions for me: to be the child's age at the time of the stroke? What was the cause of stroke? How long has it been a stroke? How long did recovery take? Do they suffer …

No one have suggestions?
My husband had a vasectomy 9Yrs. ago and we had reversed Jan.08 We try for a year in a half. I'm about to be 27. Our urologist told us to keep reporting every two days around ovulation in which we have ruined to comply mainly in British Columbia, I do not think it would have much impact British Columbia …

Nobody not find the word "delay" unpleasant?
Personally, I do. Reason is that I learned, engage and I'm still here and Children with disabilities (deafness associated with a deficiency second). I understand that it does not offend everyone, but some. This response I get the show: "I will tell every time I chose delayed as Im not …

Does anyone here can young teenagers heart / children to keep children in their child (ren)?
I often see questions from 11, 12, 13 years young people asking if we keep letting them, and most parents (like me) here tend to not speak due to his age. However, I know parents out there exist that employ children this young, children often ask the question say they already do …

Does anyone take a cool mist humidifier crane?
I think having a cool-mist humidifier for my baby's Crane Room, has anyone one of these? I was thinking of doing the Thomas model train or an animal … Thank you! I have two of these animals (frog and cow). They work well, but tanks can be difficult to …

Nobody has any designs for my website mom.?
I have a website. http://www.somethingforeverymom.net and I want it to be really clever for mothers. I like to get feedback and ideas of others. Do a search on here for Frequently asked questions like why the habit when my baby my baby …

Does anyone take to Business side of this shit or am I making more it is actually better?
So my husband and I do not have a big wedding … we actually barely hanging on a chain .. (Which he did in the past) … anyway, tomorrow is the third anniversary Juliana and my husband a while ago called to tell me her mother has more …

Is this person an inevitable baby-sitter?
Its good that you want to work and earn your own money. But you will not find a job through the responses Y Clean small errors in the language, and send a "question" an ad in your local thesis. Do not let your parents read the first announcement. It will cost a few dollars to put …

Is Does anyone know a song all about the butterflies that would be appropriate to play at the funeral of a child?
"Butterfly" Mariah Carey This is religious – if appropriate – Lyrics – http://www.butterflysong.com/index.cfm/P … To listen – * Note – this is hard enough, if you select speakers a bit … *

Nobody knows anything give or take a few bites?
My legs 18 months old son are covered in huge bites. Some crusts are more and some are filled with puss. Most bites are real about the size of a ten and they have a red spot around them on the size of a half dollar. Me and a few other parents …

Is anyone knows how to challenge fatigue?
I have two little under 2 and am finding myself more and more tired every day anyone advice to fight against it and find more energy. suggestions would help caffiene Well, sleep aid. Unfortunately, you probably will not find much of this trend. I do not think at hand is …

Does anyone know how to find children about development and parenting classes?
Your local family services should offer courses or not, who does. You can check with colleges as suggested, they have a large number of EC classes. You may also contact Head Start and ask questions about CDA (Child Development Associate) credential, they …

Does anyone know if they enjoy the Street Sesame spine in the 80's on DVD?
I want my son to be able to watch the same I grew up side, and I think it would be nice to see them together. Did they even the brand? Yes, they do .. we bought my children a season of Sesame Street …

Does anyone know about subsidized daycare contained Peel?
I need to get and child care can not pay the full price of child care. Does anyone know how long to keep them on the list is to grant in the skin? It is also here an income limit that you need to receive the grant and, if so anyone know how much it is? Thank you …

Is anyone know of any standing different layers and potty training video on the model?
Changing diapers is very close to an instinct kittens instinctively know how to use the litter box. You do not need instructions. No, I do not know why there would … the only "market" I think it is like …

Does anyone know the exact site of Megan's Law?
I was able to obtain this month a ago, it is a site where the address you enter on the land your home and registered sex offenders live in your area come. All I can find very soon the site that you are paying for it. I need the site of real politics. Thank you. …

Is Does anyone know what I can do for my son to walk?
I'll try Aquaphor. Good luck, those few feet scary! I vomited a little in my mouth! The scary thing is clearly true on somebody! How about using a grinder or a sander to remove industrial scales. Soak the baby for about a week in hot water …

Does anyone know where on earth I can find a house that requires a babysitter?
I love children and have children in step 3 of my own I want a job as custodian anyone know a site where I can sign this one? www.sittercity.com or you can try your local craigslist. Go to your local welfare …

Does anyone know where on earth can I find the moon / sun sets you surrounded your children's rooms.?
He goes on to let them know when he is allowed to wake up. I read about it in magazine parents, but can not find it now? That sounds impressive! I want to know if you find somewhere! Thank you amazon ebay google …

Is anyone knows where on earth I can get one of these? Screwball Cherry (ice cream next to the gum bottom)!?
I want one so bad I can not even think straight. I'll be stopping at every gas station and I have not found yet and I know that Bi-Lo does not wear them. Im sure one of you moms colleagues see them somewhere! …

Nobody has a lip-smacking pork chop recipe shake the long side of my carrot?
http://i382.photobucket.com/albums/oo261 … Dude develop a set. Cooking is a job womans.

Does anyone own access to a printable kilo to pounds conversion table?
I want to have one in my clinic, so when I weigh babies in kilos, parents can have a look at the list to convert pounds (to tell all grandmothers), while I write my efforts. I HAVE googled for an hour without success, so please do let me know …

Does anyone with no codes Ty Beanie earlier time Mcdonalds breakfast glad they mail me?? My son ..? 10pt?
my son loves them and wants more. If you do not want the code to play the game, please email me at: Thank racheallovesholio69@yahoo.com. :) If Please send to my e-mail because someone has posted one and someone stole it .. lol. …

Is use any force CHIP insurance for their child?
I will take a new job with a small company that does not provide insurance, so we will buy ourselves. The only problem is that my 2 year old son was not long before a diagnosis of epilepsy, and no one cover (or the cost a ton.) So, we plan to put …

Is this becoming a brand name as a parent, you feel that you Lost like the quantity of your identity?
In my psychology class, we talked about creating a huge change of identity parenting for most women, especially those who love left behind him a career, friends, and a paycheck. Have you become a parent brass vision life? No, I never abandoned my friends, I still …

Is this your rivals call on Y! A truly all honorable?
I learned the hard way in the past, but if you call that just cause drama, then the ratio of people happy. Why bother after adjectives? If you know the person who is a cigarette butt is just irrational, therefore, why not just ignore them? Or Kill 'Em near …

Is developed adult supervision that pilferage?
must be sober? Yes. Yes Indeed, if the adult is not sober, he / Is contained in no place to oversee anything. His state of mind is distorted. What happens if my child got into some chemicals and has collapsed … Could you be driving drunk him to the hospital? Could you tell them …

Is drug use on the mother song cause autism?
No, the only link that has scientifically proven drug use and maternal TROLLISM. Well, my son is autistic and I can assure you that I have never done drugs! I'm not a deliberate really knows what causes autism. Source (s): peace

More Parenting issues please visit: BabyFreeFAQ.com

Carpet Care-DIY

 

How To Make Cleaning Easier

August 9, 2010 by stain remover expert No Comments »

how to make cleaning easier

Using Roomba Robotic Floorvac for Easy Cleaning

Like any household chore, vacuuming is something that has not really give us a thrill when we realize that, once again it is time to start Cleaning The House a bit. Besides taking a lot of our time, household chores such as vacuum is something that can really bore the hell out of you. For this reason, the company iRobot has created its internal robotic marvel, the Roomba robotic Floorvac. With this clever device, it is absolutely not necessary for you to worry about the dust bunny collection under your couch or in your carpet, because as long as you have the Roomba robotic Floorvac, you are assured that you will always immaculately clean house.

The Roomba robotic Floorvac currently operates on rechargeable batteries, you must also worry not spend much to maintain in working order, the Roomba Robotic Floorvac models, apart from having rechargeable batteries, also the auto-reload "feature that makes these Roomba Robotic Floorvac more effective and convenient for your personal use.
When it comes to his work, the Roomba robotic needs Floorvac not supervision as he slides his way around your home with great ease, equipped with sensors that will guide him through as he prowls around your house – do not fall on the stairs or a lump in your furniture, the Roomba robotic Floorvac make sure it cleans all the nooks and crannies that can find. With the Roomba robotic Floorvac, you are sure to be able to relax, enjoy your time in the house or attend to more important things this robot was really done wonders for your comfort when it comes to keeping the house. If this is not enough to make you believe that buying a Roomba Robotic Floorvac for yourself, well, did you know that after the end of a task, it will leave a ringing tone that is finished with the work automatically turns itself off! Nothing like vacuuming effective and safe?

You might start thinking, " which cost me a lot, will not it? Roomba Robotic Floorvac models but are actually very affordable and well worth your investment. It is very dangerous to use the Roomba robotic Floorvac, even if you have children around the house, the robot vacuum cleaner is certainly changing the way most people live today with its many ingenious and comfort can only lead to better things to come, more and more of Improvements are underway on the Roomba Floorvac and its many accessories available.

There are actually four models now available Roomba robotic Floorvac in the market today as well as an assortment of accessories that will help support make your life better with your Roomba Floorvac robotics. Accessories that will help you get better mileage when it comes to getting the most out of your best companion for your vacuum cleaner Daily household.

A brief overview of the Roomba robotic models currently available Floorvac today: * The Red Roomba – a good entry level Roomba Robotic Floorvac model that will help you with your basic needs of the vacuum.

* The Roomba Discovery – one of the high-end Roomba Floorvac robotic models, this baby is more feature rich than those mentioned above, with its self-loading feature, you must worry not for your Roomba robotic batteries Floorvac never unload on you. Perfect for the busy, even people distracted.

* Discovery Roomba SE – a big improvement on the existing model Roomba Discovery feature has been added to it is its ability to wall mount in which Roomba Floorvac ingenious robot will be capable of security itself Tuck far away during loading so as not to be stepped on – all Just how out of everyone.

* The Roomba Scheduler – perfect for those who are willing to invest more on a good model Roomba robotic Floorvac for his many "for-your-convenience" features like the ability to program your Roomba robotic Floorvac specific times and the dates you want to have it will work.

Make $100 – $200 Per Day Doing Easy Office Cleaning

 

Easy Cleaning Routine

by stain remover expert No Comments »

easy cleaning routine

Berber Carpet Cleaning – Maintenance and Cleaning Tips for Berber carpets

Berber carpet flooring is very versatile for home, it is fashionable and practical. When people are choosing flooring, you will find that the carpet is chosen more than half the time. There are texture and color and gives you unlimited possibilities of decorating a room. When Decorating with carpet you get a feeling of warmth and comfort to beautify your house.

Berber carpet is a very popular mats available to decorate your home today. Berber is not a type of carpet, but it is a carpet consisting of small, dense small loops. These loops are crowded together and woven into parallel lines. They can withstand a lot of traffic on foot and you do not see the imprint and the wear patterns. The main reason to choose the Berber is because is easy to maintain and can be very beautiful for many years.

The best way to keep your Berber carpet is nice to have a is regular Cleaning Schedule. By vacuuming regularly and often dirt is not likely to grind the tissue. If your vacuum cleaner has a beater bar does not empty on any snags in the carpet in bulk. If you have animals that have sharp fingernails or children who have sharp objects may cause in your draws Berber carpet. Also remove the spots appear is the best way to maintain the beauty of your Berber carpet.

You can stop the damage that may cause the dirt from your carpet by removing your shoes at the door. You get the dirt and grime, oil, mud and other sticky substances on your track shoes and get on the carpet. This leaves dark lanes in areas with heavy traffic. These channels can be difficult to remove and removing your shoes at the door can be prevented.

Berber carpet is made with different fiber types and each type requires a different method for cleaning. Berber The most common situations that many difficult cleaning is made of olefin. The best way to clean this type of cleaning Steam is Berber. The biggest problem with an olefin, is that it fades after cleaning. Also dragging furniture on olefins will develop brands that can not be removed. Any oil stains adheres with an olefin and can not be removed. The only way the carpets Berber olefins will clean air is to use a cleaning solution that has a pH that is higher. The disadvantage is that the carpet is dirty faster.

When you choose berber carpet nylon gives you the elegance that does not come with price tag of wool. Nylon will stand stain and a lot of traffic up olefins. Because nylon resists stains and mildew better than other tissues. One of the best features nylon Berber is that it is resistant to crush. It is ideal for areas that receive a large amount of foot traffic. Best method to clean a Berber carpet is nylon carpet with a low moisture cleaning methods. It will get better results and carpets are dry very quickly.

If you decide to buy wool berber carpet, you'll be delighted with the performance. Wool is a occurring natural quality that makes it resistant to stains and wear resistant. These qualities are not found in synthetic carpets. When clean Berber carpet made of wool you need to clean with a dry foam method of cleaning, but you'll be thrilled by the results.

With Berber carpet, you have many choices and developing a good cleaning routine, you can enjoy the benefits for many years future.

Nexus Easy Cleaning

 

House Cleaning License

August 6, 2010 by stain remover expert No Comments »

house cleaning license
Do you have a license in Florida to work as a maid or own homes?

House maintenance license

I doubt. Clean house money, best ways to make money!

Squeeky Clean House Cleaning

 

Professional Home Cleaning Tips

July 28, 2010 by stain remover expert No Comments »

professional home cleaning tips
GRIME FIGHTERS cleaning products that we love: When you can not hire a maid, try these small wonders. In a perfect world, there would not hand basin.
House Cleaning Tips & Advice : Home Laundry Tips

 

Daily Household Cleaning Schedule

July 26, 2010 by stain remover expert No Comments »

daily household cleaning schedule

Commercial Cleaning Service

When you submit your work space and office to potential customers or potential customers, do you they see a dirty, unkempt, stains on walls, dusty surfaces, the kitchen in disarray, blotchy carpets, and tough spills coffee on the conference table? It might work for you and your employees, but you can scare away customers. And, of course, there is not much employees who have suffered this kind of work environment dysfunctional long before approaching the human resources or management about the problem.

A professional Commercial Cleaning Services can take the chore of cleaning heavy desk. All employees and management tasks, or have no time to do so, and all the hard work that not in their job descriptions, janitorial work, you can choose to submit to experienced professionals cleaning.

Apart from the dirt toll aesthetic takes office, there are tangible health risks of working in a dirty environment. Think the accumulation of germs employees are exposed to every day. Streptococcus, rhinovirus, staphylococci, E. coli, influenza, salmonella, and germs cold. They come from a customer who sneezes, sick baby to a client, from the kitchen faucet and leftover meals, door handles, the bottom of a handbag, desk phones and sink.

Hiring commercial cleaners will not only clean up your desktop and remove stains long, it will reinforce a healthy atmosphere. And it could also send the message that you are an employer who cares about making the environment Working as welcoming as the family environment. Clean, comfortable, attractive, friendly, and healthy.

Commercial cleaning services are not only a Household Cleaning Products. They have access to quality hospital disinfectants and chemicals and machinery to thoroughly clean the carpet of the office, and waxing tile floors.

Here's a short list of services offered and locations covered by a commercial cleaning company:

Bathrooms Trash collection and processing of recyclable materials, stairs and elevators, sweeping, cleaning, polishing floors, disinfecting door handles and microwaves, refrigerators, air-conditioning vents, windows and blinds, replacing light bulbs, washing lighting, baseboards, Carpet Cleaning and (to get rid of allergens).

The list is long, because the cleaning service business can adapt work to the needs of the Office. Inquire on a custom schedule based on daily, weekly, or monthly cleanings. The company may be able to offer you a free quote, too.

Generally, commercial cleaning companies have loads of $ 250 per month (a basic charge for more than a minimum service) $ 877 for a three days per week, $ 599 per week for cleaning two days a week and $ 375 per month for cleaning one day a week. (Keep in mind that these are all rough estimates. You must first speak with your provider about commercial cleaning their rights and royalties. The above prices are approximate indications.)

Who should hire a commercial cleaning service?

Offices sees often when customers or employees working for the majority of the day will think of these services. For the sake of having a functional environment and clean, and protect the health of employees, it is wise to examine how office space can be better maintained.

Places that see frequent visitors, as dental, medical and hospital waiting rooms should reflect those services. A clean environment is not only visitors feel welcome. It helps them feel secure, too, and convinced that they came to the clinic or medical center that the values of healthy choices and cleanliness.

sandwiches and ice cream parlors face presentation also. A patron walks in and wants to order food. But few People feel comfortable ordering food in a dirty, stained cons. Few people prefer to have a slice of pizza in a booth adjacent to a stained wall splash of soda. And very few customers would return to an eating establishment where they considered the installation of room unsightly and odorous bath.

What are the advantages and disadvantages to this?

The effects of hiring A Cleaning Service Trade can impress customers, clients feel in many respects, treated and important (and they are important). own work environments also improve morale, which could boost the productivity and efficiency.

In addition, a cleaning service takes care of all the parties stony maintain a clean and tidy, leaving employees to focus only on their work.

And then think what really needs to be cleaned, and if employees can not here and there to do the job. Sometimes sink full of dirty dishes do not require Professional Cleaning. Everything he needs is for employees to wash the dishes after lunch and put them in a dishwasher themselves. A bit of individual effort can go a long way together.

Here is the bottom line with commercial cleaning:

There are health and beauty benefits for cleaning, washing, disinfection and business establishment. A commercial cleaning service to all equipment and know-how to do the job. Bathrooms handles door, the pros take care of every detail.

Movado House Cleaning BRAND NEWW 2000999999

 

Professional Cleaning

July 23, 2010 by stain remover expert No Comments »

professional cleaning

How Professional Cleaning can extend the life of carpet

John Pletz has worked in the cleaning business for over two decades, and he knows a thing or two about extending the life of your carpet. Regular Carpet Cleaning professional can save a business not only time and money, but also a lot of aggravation, "said Pletz, who is CEO of ServiceMaster Clean by Pletz, based in Crystal Lake, Illinois:

Cleaning Carpet can be compared to doing the laundry. Take your shirt and put it on the ground. Now, walk over it for six months, wash, then back on your back. It remains Wona € ™ t feel very clean. Itâ € ™ s the same with your carpet. Even if they are designed to hide dirt, they still retain dirt â € "unless you maintain them properly.

The most important thing you can do to keep your carpet is to vacuum regularly. This may seem obvious but itâ € ™ s amazing how often people forget a simple golden rule. Another important method of maintenance to prevent soil from migrating into your building is to use a good system mats.

The importance of mats

Mats is designed to capture the dirt from your shoes before it is followed in your office. Clean the carpet in your office regularly or theyâ € ™ ll become a major source of migration dirt in your company. And Donâ € ™ t forget that vacuuming should include not only the carpet in your office but also a full draw of your carpet on a regular basis.

Vacuum carpets regularly and is very critical because the particles down the back of the carpet, and as they can be sharp, they can possibly cut the rug itself, resulting in a loss of carpet fibers. A challenge facing many companies is when the dust of the ground is deeply in the carpet and finally gets deeply embedded in the media. This means that even when you clean a carpet it drops and you can see the dirt.

This occurs because the water seeps into the carpet to clean, making it wet on the bottom. Finally, the water evaporates, bringing some of the ground into the earth to the surface like dust and other particles migrate upwards â € "because they have no other where to go. You will see a box horribly dirty and one would think that the carpet Hasna € ™ t been cleaned, when in reality it Hasna € ™ t been cleaned enough.

Get professionals

With a regular routine vacuuming, two carpets and rugs must be professionally cleaned on a regular basis, but the carpet must be cleaned more often than carpets. One reason for this is that if you employ the use of carpet properly, and keep them clean to the standard, your carpet will stay cleaner and and you Wona € ™ t have to clean them often.

In general, we recommend you use a service mat if you have a lot of traffic in your office, they usually come to you and take the pads away and cleaned professionally. My number two suggestion is to have your own carpet cleaning service carpet and on a regular.

Extend carpet life of third

You can extend the life of carpets in your business as long as 35% simply by keeping them properly. The value of this is not just the cost. Think of the inconvenience of having your office everything has changed around putting new carpet. It can really be terribly inconvenient and it's something that can be easily avoided.

Protecting your carpet investment, implementing a maintenance program that allows your carpets to stay looking great longer, while saving money same time!

Servicemaster Professional Cleaning

 

Email List Cleaning Software

July 17, 2010 by stain remover expert No Comments »

email list cleaning software
Coverage may not be the best way to protect against identity theft as the ITV drama series new identity unfolds, you would forgiven for thinking that the criminal identity fraud is grim and complicated.
Address Verification Software Demo

 

Daily Cleaning Lists

July 14, 2010 by stain remover expert No Comments »

daily cleaning lists
Rapid Response Act of Payment: Floods in North, Central and Eastern provinces, Switzerland – Alliance Payment Act Fast Response Application No 8 / 2010 Romania remittances To: Ecumenical Association of Churches in Romania – AIDRom Amount Sent: U.S. $ 59,950 Date: July 8, 2010 Details Reply …
San Diego Foreclosure Homes List – Updated daily

 

Weekly House Cleaning Schedule Template

by stain remover expert No Comments »

[mage lang="en|fr|en" source="flickr"]weekly house Cleaning Schedule template[/mage]

Computer Virus

In 1983, Fred Cohen coined the term “computer virus”, postulating a virus was “a program that can ‘infect’ other programs by modifying them to include a possibly evolved copy of itself.” The term virus is actually an acronym for Vital Information Resources Under Seize. Mr. Cohen expanded his definition a year later in his 1984 paper, “A Computer Virus”, noting that “a virus can spread throughout a computer system or network using the authorizations of every user using it to infect their programs. Every program that gets infected may also act as a virus and thus the infection grows.” Computer viruses, as we know them now, originated in 1986 with the creation of Brain – the first virus for personal computers. Two brothers wrote it (Basid and Farooq Alvi who ran a small software house in Lahore, Pakistan) and started the race between viruses and anti-virus programs which still goes on today.
Using the above explanation, it can be said that viruses infect program files. However, viruses can also infect certain types of data files, specifically those types of data files that support executable content, for example, files created in Microsoft Office programs that rely on macros.
Compounding the definition difficulty, viruses also exist that demonstrate a similar ability to infect data files that don’t typically support executable content – for example, Adobe PDF files, widely used for document sharing, and .JPG image files. However, in both cases, the respective virus has a dependency on an outside executable and thus neither virus can be considered more than a simple ‘proof of concept’. In other cases, the data files themselves may not be infectable, but can allow for the introduction of viral code. Specifically, vulnerabilities in certain products can allow data files to be manipulated in such a way that it will cause the host program to become unstable, after which malicious code can be introduced to the system. These examples are given simply to note that viruses no longer relegate themselves to simply infecting program files, as was the case when Mr. Cohen first defined the term. Thus, to simplify and modernize, it can be safely stated that a virus infects other files, whether program or data.
Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer like a biological virus passes from person to person.
There are similarities at a deeper level, as well. A biological virus is not a living thing. A virus is a fragment of DNA inside a protective jacket. Unlike a cell, a virus has no way to do anything or to reproduce by itself — it is not alive. Instead, a biological virus must inject its DNA into a cell. The viral DNA then uses the cell’s existing machinery to reproduce itself. In some cases, the cell fills with new viral particles until it bursts, releasing the virus. In other cases, the new virus particles bud off the cell one at a time, and the cell remains alive.
A computer virus shares some of these traits. A computer virus must piggyback on top of some other program or document in order to get executed. Once it is running, it is then able to infect other programs or documents. Obviously, the analogy between computer and biological viruses stretches things a bit, but there are enough similarities that the name sticks.
A computer virus is a program that replicates. To do so, it needs to attach itself to other program files (for example, .exe, .com, .dll) and execute whenever the host program executes. Beyond simple replication, a virus almost always seeks to fulfill another purpose: to cause damage.
Called the damage routine, or payload, the destructive portion of a virus can range from overwriting critical information kept on the hard disk’s partition table to scrambling the numbers in the spreadsheets to just taunting the user with sounds, pictures, or obnoxious effects.
It’s worth bearing in mind, however, that even without a ”damage routine”, if viruses are allowed to run unabated then it will continue to propagate–consuming system memory, disk space, slowing network traffic and generally degrading performance. Besides, virus code is often buggy and can also be the source of mysterious system problems that take weeks to understand. So, whether a virus is harmful or not, its presence on the system can lead to instability and should not be tolerated.
Some viruses, in conjunction with “logic bombs,” do not make their presence known for months. Instead of causing damage right away, these viruses do nothing but replicate–until the preordained trigger day or event when they unleash their damage routines on the host system or across a network.

Impact of Viruses on Computer Systems
Virus can be reprogrammed to do many kinds of harm including the following.
1.Copy themselves to other programs or areas of a disk.
2.Replicate as rapidly and frequently as possible, filling up the infected system’s disk and memory rendering the systems useless.
3.Display information on the screen.
4.Modify, corrupt or destroy selected files.
5.Erase the contents of entire disks.
6.Lie dormant for a specified time or until a given condition is met, and then become active.
7.Open a back door to the infected system that allows someone else to access and even control of the system through a network or internet connection.
8.Some viruses can crash the system by causing some programs (typically Windows) to behave oddly.
How viruses spread from one system to another?
The most likely virus entry points are email, Internet and network connections, floppy disk drives, and modems or other serial or parallel port connections. In today’s increasingly interconnected workplace (Internet, intranet, shared drives, removable drives, and email), virus outbreaks now can spread faster and wider than ever before.

The following are some common ways for a virus to enter the users’ computer system:
•Email attachments
•Malicious scripts in web pages or HTML email
•FTP traffic from the Internet (file downloads)
•Shared network files & network traffic in general
•Demonstration software
•Pirated software
•Shrink-wrapped, production programs (rare)
•Computer labs
•Electronic bulletin boards (BBS)
•Diskette swapping (using other people’s diskettes for carrying data and programs back and forth)

High risk files

The most dangerous files types are:
.EXE, .COM, .XLS, .DOC, .MDB
Because they don’t need any special conversion to infect a computer — all they’ve got to do is run and consequently the virus spreads. It has been estimated that 99% of all viruses are written for these file formats.
A list of possible virus carriers includes:
EXE – (Executable file)
SYS – (Executable file)
COM – (Executable file)
DOC – (Microsoft Word)
XLS – (Microsoft Excel)
MDB – (Microsoft Access)
ZIP – (Compressed file, common in the USA)
ARJ – (Compressed file, common in the USA)
DRV – (Device driver)
BIN – (Common boot sector image file)
SCR – (Microsoft screen saver)

Common Symptoms Of Virus Infection

Computer does not boot.
Computer hard drive space is reduced.
Applications will not load.
An application takes longer to load than normal time period.
Hard dive activity increases especially when nothing is being done on the computer.
An anti virus software message appears.
The number of hard drive bad sectors steadily increases.
Unusual graphics or messages appear on the screen
Files are missing (deleted)
A message appears that hard drive cannot be detected or recognized.
Strange sounds come from the computer.
Some viruses take control of the keyboard and occasionally substitute a neighboring key for the one actually pressed. Another virus “swallows” key presses so that nothing appears on the screen.
Also interesting are system time effects. Clocks going backwards are especially frightening for workers who cannot wait to go home. More seriously though, this type of virus can cause chaos for programs which depend on the system time or date.
Some viruses can cost the user dearly by dialing out on his modem. We do not know of one which dials premium telephone numbers but no doubt we shall see one soon. One particularly malicious virus dials 911 (the emergency number in the USA) and takes up the valuable time of the emergency services.

Categories of viruses
Depending on the source of information different types of viruses may be categorized in the following ways:

PDA VIRUSES
The increasing power of PDAs has spawned a new breed of viruses. Maliciously creative programmers have leveraged the PDA’s ability to communicate with other devices and run programs, to cause digital mayhem.
The blissfully safe world where users of these devices could synchronize and download with impunity came to an end in August 2000 with the discovery of the virus Palm Liberty. Since then, many more viruses have been discovered.
Though not yet as harmful as their PC-based cousins, these viruses still pose a threat to unsuspecting users. Their effects vary from the harmless flashing of an unwanted message or an increase in power consumption, to the deletion of all installed programs. But the threat is growing, and the destructiveness of these viruses is expected to parallel the development of the devices they attack.

MULTIPARTITE VIRUSES
A virus that combines two or more different infection methods is called a multipartite virus. This type of virus can infect both files and boot sector of a disk. Multi-partite viruses share some of the characteristics of boot sector viruses and file viruses: They can infect .com files, .exe files, and the boot sector of the computer’s hard drive. On a computer booted up with an infected diskette, the typical multi-partite virus will first make itself resident in memory then infect the boot sector of the hard drive. From there, the virus may infect a PC’s entire environment. Not many forms of this virus class actually exist. However, they do account for a disproportionately large percentage of all infections. Tequila and Anticad are the examples of multipartite viruses.

BOMBS
The two most prevalent types of bombs are time bombs and logic bombs. A time bomb hides on the victim’s disk and waits until a specific date before running. A logic bomb may be activated by a date, a change to a file, or a particular action taken by a user or a program. Bombs are treated as viruses because they can cause damage or disruption to a system.

BOOT SECTOR VIRUSES
Until the mid-1990s, boot sector viruses were the most prevalent virus type, spreading primarily in the 16-bit DOS world via floppy disk. Boot sector viruses infect the boot sector on a floppy disk and spread to a user’s hard disk, and can also infect the master boot record (MBR) on a user’s hard drive. Once the MBR or boot sector on the hard drive is infected, the virus attempts to infect the boot sector of every floppy disk that is inserted into the computer and accessed. Examples of boot sector viruses are Michelangelo, Satria and Keydrop.
Boot sector viruses work like this: Let us assume that the user received a diskette with an infected boot sector. The user copied data from it but forgot to remove it from drive A:. When he started the computer next time the boot process will execute the infected boot sector program from the diskette. The virus will load first and infect the hard disk. Note that this can be prevented by changing the boot sequence in CMOS (Let C: drive boot before A:). By hiding on the first sector of a disk, the virus is loaded into memory before the system files are loaded. This allows it to gain complete control of DOS interrupts and in the process replaces the original contents of the MBR or DOS boot sector with their own contents and move the original boot sector data to another area on the disk. Because the virus has infected a system area of the hard disk it will be loaded into memory each time the computer is started. It will first take control of the lowest level disk system services before executing the original boot sector code which it has stored in another part of the hard disk. The computer seems to behave exactly as it should. Nobody will notice the extra few fractions of a second added to the boot sequence.
During normal operation the virus will happily stay in memory. Thanks to the fact that it has control of the disk services it can easily monitor requests for disk access – including diskettes. As soon as it gets a request for access to a diskette it will determine that there is a diskette in the floppy drive. It will then examine its boot sector to see if it has already been infected. If it finds the diskette clean it will replace the boot sector with its own code. From this moment the diskette will be a “carrier” and become a medium for infections on other PC’s.

The virus will also monitor special disk requests for access to the boot sector. The boot sector contains its own code, and a request to read it could be from an anti-virus program checking for virus presence. The virus will not allow the boot sector to be read and will redirect all requests to the place on the hard disk where it has backed up the original contents. In this way nothing unusual is detected. Such methods are called stealth techniques and their main goal is to mask the presence of the virus. Not all boot viruses use stealth but those which do are common.
Boot viruses also infect the non-file (system) areas of hard and floppy disks. These areas offer an efficient way for a virus to spread from one computer to another. Boot viruses have achieved a higher degree of success than program viruses in infecting their targets and spreading.
Boot virus can infect DOS, Windows 3.x, Windows 95/98, Windows NT, and even Novell Netware systems. This is because they exploit inherent features of the computer (rather than the operating system) to spread and activate.
Cleaning up a boot sector virus can be performed by booting the machine from an uninfected floppy system disk rather than from the hard drive, or by finding the original boot sector and replacing it in the correct location on the disk.

CLUSTER VIRUSES
This type of virus makes changes to a disks file system. If any program is run from the infected disk, the program causes the virus to run as well. This technique creates the illusion that the virus has infected every program on the disk.

E-MAIL VIRUSES
These types of viruses can be transmitted via e-mail messages sent across private networks or the internet. Some e-mail viruses are transmitted as an infected attachment- a document file or program that is attached to the message. This type of virus is run when the victim opens the file that is attached to the message. Other types of email viruses reside within the body of the message itself. To store a virus, the message must be encoded in html format. Once launched many e-mail viruses attempt to spread by sending messages to everyone in the victim’s address book; each of those contains a copy of the virus.
The latest thing in the world of computer viruses is the e-mail virus called Melissa virus which surfaced in March 1999. Melissa spread in Microsoft Word documents sent via e-mail, and it worked like this:
Someone created the virus as a Word document uploaded to an Internet newsgroup. Anyone who downloaded the document and opened it would trigger the virus. The virus would then send the document (and therefore itself) in an e-mail message to the first 50 people in the person’s address book. The e-mail message contained a friendly note that included the person’s name, so the recipient would open the document thinking it was harmless. The virus would then create 50 new messages from the recipient’s machine. As a result, the Melissa virus was the fastest-spreading virus ever seen and it forced a number of large companies to shut down their e-mail systems at that time.
The ILOVEYOU virus, which appeared on May 4, 2000, was even simpler. It contained a piece of code as an attachment. People who double clicked on the attachment allowed the code to execute. The code sent copies of itself to everyone in the victim’s address book and then started corrupting files on the victim’s machine. This is as simple as a virus can get. It is really more of a Trojan horse distributed by e-mail than it is a virus.
The Melissa virus took advantage of the programming language built into Microsoft Word called VBA, or Visual Basic for Applications. It is a complete programming language and it can be programmed to do things like modify files and send e-mail messages. It also has a useful but dangerous auto-execute feature. A programmer can insert a program into a document that runs instantly whenever the document is opened. This is how the Melissa virus was programmed. Anyone who opened a document infected with Melissa would immediately activate the virus. It would send the 50 e-mails, and then infect a central file called NORMAL.DOT so that any file saved later would also contain the virus! It created a huge mess.
FILE INFECTING VIRUSES
File infectors operate in memory and usually infect executable files with the following extensions: *.COM, *.EXE, *.DRV, *.DLL, *.BIN, *.OVL, *.SYS. They activate every time the infected file is executed by copying themselves into other executable files and can remain in memory long after the virus has activated.
Thousands of different file infecting viruses exist, but similar to boot sector viruses, the vast majority operates in a DOS 16-bit environment. Some, however, have successfully infected the Microsoft Windows, IBM OS/2, and Apple Computer Macintosh environments.
File viruses can be separated further into sub-categories by the way they manipulate their targets:

TSR FILE VIRUSES
A less common type of virus is the terminate-and-stay-resident file virus. As the name suggests these infect files usually these are .com and .exe files. there are however some device driver viruses, some viruses that infect overlay files, and although over 99% of executable programs have the extension .com and .exe, some do not .For a TSR virus to spread some one has to run an infected program. The virus goes memory resident typically looking at each program run thereafter and infects it. Examples of TSR file viruses are Dark Avenger and Green Caterpillar.

OVERWRITING VIRUSES
These viruses infect by overwriting part of their target with their own code but, by doing so, they damage the file. The file will never serve another purpose other than spreading the virus further. Because of this they are usually detected quickly and do not spread easily.

PARASITIC VIRUSES
These viruses attach themselves to executables without substantially changing the contents of the host program. They attach by adding their code to the beginning, end, or even middle of the file and divert program flow so that the virus is executed first. When the virus has finished its job, control is passed on to the host. Execution of the host is a little delayed but this is usually not noticeable.

MACRO VIRUSES
Many older applications had simple macro systems that allowed the user to record a sequence of operations within the application and associate them with a specific keystroke. Later, the user could perform the same sequence of operations by merely hitting the specified key.
Newer applications provide much more complex macro systems. User can write entire macro-programs that run within the word processor or spreadsheet environment and are attached directly onto word processing and spreadsheet files. Unfortunately, this ability also makes it possible to create macro viruses.
Macro viruses currently account for about 80 percent of all viruses, according to the International Computer Security Association (ICSA), and are the fastest growing viruses in computer history. Unlike other virus types, macro viruses aren’t specific to an operating system and spread with ease via email attachments, floppy disks, Web downloads, file transfers, and cooperative applications.
Macro viruses are, however, application-specific. A macro virus is designed to infect a specific type of document file, such as Microsoft word or excel files. They infect macro utilities that accompany such applications as Microsoft Word and Excel, which means a Word macro virus cannot infect an Excel document and vice versa. A macro virus is embedded in a document file and can travel between data files in the application and can eventually infect hundreds of files if undeterred and in the process do various levels of damage to data from corrupting documents to deleting data.
Macro viruses are written in “every man’s programming language” — Visual Basic — and are relatively easy to create. They can infect at different points during a file’s use, for example, when it is opened, saved, closed, or deleted
A typical chronology for macro virus infection begins when an infected document or spreadsheet is loaded. The application also loads any accompanying macros that are attached to the file. If one or more of the macros meet certain criteria, the application will also immediately execute these macros. Macro viruses rely upon this auto-execution capability to gain control of the application’s macro system.
Once the macro virus has been loaded and executed, it waits for the user to edit a new document, and then kicks into action again. It attaches its virus macro programs onto the new document, and then allows the application to save the document normally. In this fashion, the virus spreads to another file and does so in a completely discrete fashion. Users have no idea of the infection. If this new file is later opened on another computer, the virus will once again load, be launched by the application, and find other unsuspecting files to infect.

Finally, as far as a macro virus is concerned, the application serves as the operating system. A single macro virus can spread to any of the platforms on which the application is installed and running. For example, a single macro virus that uses Microsoft Word could conceivably spread to Windows 3.x, Windows 95/98, Window NT, and the Macintosh.

Macro viruses for Word

In the summer of 1995, Microsoft Word 6 was the first product affected with macro virus. The first one (WM/Concept.A) was really only a proof of concept – one of the installed macros (called Payload) contained only this remark:
“That’s enough to prove my point”
Most macro viruses for Word use a feature called ‘automacros’. The basic principle is that some macros with special names are automatically executed when Word starts, opens a file, or closes a file. The macro virus then inserts macros into NORMAL.DOT – a standard template which is loaded every time Word starts.
In Word there are some ways to disable automacros but this isn’t the ultimate solution. Some macro viruses use other methods to take control over the Word environment.
Another method of self-protection may be to set NORMAL.DOT to read only. But this can also be bypassed and, in addition, it prevents the user from customizing the template.

Macro viruses for Excel

Excel has the same opportunities for virus authors as Word. It has automacros and a directory called XLSTART from which templates are automatically loaded.
But Excel does not have just normal VBA macros like Word. In Excel there are so called ‘formulas’ – macros stored in spreadsheet cells. The first macro virus using this technology was XF/Paix.

Macro viruses for other MS Office products:

Writing a macro virus for other Office products is not difficult. There have been already some viruses for Access, and it is expected that there will be macro viruses for Power Point in the near future.

But those macro viruses are not as dangerous as the macro viruses for Word or Excel. Not because of some limitation of these other Office products, but because data files from these products are not so frequently shared.

There is one danger which can be seen in today’s Power Point even without native macro viruses written for this product. Programmers can include in their presentation any number of objects from Excel or Word. And these objects can be infected with macro viruses – if they edit the presentation and open the infected object with its parent application, then the virus can spread further.

But the current situation may change dramatically over the next few years. Microsoft has licensed VBA technology to many firms, so one can expect to see more macro viruses for other products, too.

POLYMORPHIC VIRUSES
This type of virus can change itself each time it is copied, making it difficult to isolate. Most simple viruses attach identical copies of themselves to the files they infect. An anti-virus program can detect the virus’s code (or signature) because it is always the same and quickly ferret out the virus. To avoid such easy detection, polymorphic viruses operate somewhat differently. Unlike the simple virus, when a polymorphic virus infects a program, it scrambles its virus code in the program body. This scrambling means that no two infections look the same, making detection more difficult. These viruses create a new decryption routine each time they infect, so every infected file will have a different sequence of virus code.

STEALTH VIRUSES
Stealth viruses actively seek to conceal themselves from attempts to detect or remove them. They also can conceal changes they make to other files, hiding the damage from the user and the operating system.
Stealth viruses, or Interrupt Interceptors, as they are sometimes called, take control of key DOS-level instructions by intercepting the interrupt table, which is located at the beginning of memory. This gives the virus the ability to do two important things: 1) gain control of the system by re-directing the interrupt calls, and 2) hide itself to prevent detection. They use techniques such as intercepting disk reads to provide an uninfected copy of the original item in place of the infected copy (read-stealthing viruses), altering disk directory or folder data for infected program files (size-stealthing), or both. For example, the Whale virus is a size-stealthing virus. It infects .EXE program files and alters the folder entries of infected files when other programs attempt to read them. The Whale virus adds 9216 bytes to an infected file. Because changes in file size are an indication that a virus might be present, the virus then subtracts the same number of bytes (9216) from the file size given in the directory/folder entry to trick the user into believing that the file’s size has not changed.
An antivirus program which is not equipped with anti-stealth technology will be deceived.

COMPANION VIRUSES

A companion virus is the exception to the rule that a virus must attach itself to a file. The companion virus instead creates a new file and relies on a behavior of DOS to execute it instead of the program file that is normally executed. These viruses target EXE programs. They create another file of the same name but with a COM extension containing the virus code. These viruses take advantage of a property of MS-DOS which allows files to share the same first name in the same directory (e.g. ABC.EXE and ABC.COM) but executes COM files in preference to EXE files.
For example, the companion virus might create a file named CHKDSK.COM and place it in the same directory as CHKDSK.EXE. Whenever DOS must choose between executing two files of the same name where one has an .EXE extension and the other a .COM extension, it executes the .COM file. This is not an effective way of spreading but has one big advantage – it does not amend files in any way and so can escape integrity tests or resident protection. Another method which can be used by companion viruses is based on defined path. A virus simply puts an infected file into the path listed before the directory within the original program.

PROGRAM VIRUSES
Like normal programs, program viruses must be written for a specific operating system. The vast majority of viruses are written for DOS but some have been written for Windows 3.x, Windows 95/98, and even UNIX. All versions of Windows are compatible with DOS and can host DOS viruses with varying degrees of success. Program viruses infect program files, which commonly have extensions such as .COM, .EXE, .SYS, .DLL, .OVL, or .SCR. Program files are attractive targets for virus writers because they are widely used and have relatively simple formats to which viruses can attach.

Malicious Programs and Scripts

Viruses that infect agent programs (such as those that download software from the Internet; for example, JAVA and ActiveX).

WORM

A worm is a computer program that has the ability to copy itself from machine to machine. Worms normally move around and infect other machines through computer networks. An entire LAN or corporate e-mail system can become totally clogged with copies of a worm, rendering it useless. Worms are commonly spread over the internet via e-mail message attachments and through internet relay chat channels.
For example, the Code Red worm replicated itself over 250,000 times in approximately nine hours on July 19, 2001.
A worm usually exploits some sort of security hole in a piece of software or the operating system. For example, the Slammer worm (which caused mayhem in January 2003) exploited a hole in Microsoft’s SQL server.
Worms use up computer time and network bandwidth when they are replicating, and they often have some sort of evil intent. A worm called Code Red made huge headlines in 2001. Experts predicted that this worm could clog the Internet so effectively that things would completely grind to a halt.
The Code Red worm slowed down Internet traffic when it began to replicate itself, but not nearly as badly as predicted. Each copy of the worm scanned the Internet for Windows NT or Windows 2000 servers that do not have the Microsoft security patch installed. Each time it found an unsecured server, the worm copied itself to that server. The new copy then scanned for other servers to infect. Depending on the number of unsecured servers, a worm could conceivably create hundreds of thousands of copies.
The Code Red worm was designed to do three things:
•Replicate itself for the first 20 days of each month
•Replace Web pages on infected servers with a page that declares “Hacked by Chinese”
•Launch a concerted attack on the White House Web server in an attempt to overwhelm it
The most common version of Code Red is a variation, typically referred to as a mutated strain, of the original Ida Code Red that replicated itself on July 19, 2001.

TROJAN HORSES

Trojans, another form of malware, are generally agreed upon as doing something other than the user expected, with that “something” defined as malicious. Most often, Trojans are associated with remote access programs that perform illicit operations such as password-stealing or which allow compromised machines to be used for targeted denial of service attacks. One of the more basic forms of a denial of service (DoS) attack involves flooding a target system with so much data, traffic, or commands that it can no longer perform its core functions. When multiple machines are gathered together to launch such an attack, it is known as a distributed denial of service attack, or DDoS.
Because Trojan horses do not make duplicates of themselves on the victims disk (or copy themselves to other disks), they are not technically viruses. But because they can do harm, many experts consider them to be a type of virus. Trojan horses are often used as by hackers to create a back door to an infected system. Trojans, such as BackOrrifice are very dangerous. If anyone runs this program and his computer is connected to the internet, then the hacker can take control of that computer – transfer files to or from the computer, capture screen contents, run any program or kill any running process, etc.

Once a Trojan is installed onto the system this program has the same privileges as the user of the computer and can exploit the system to do something the user did not intend such as:
Delete files
Transmit to the intruder any files that the user can read
Change any files that the user can modify
Install other programs with the user’s privileges
Execute privilege-elevation attacks—the Trojan can attempt to exploit a weakness to raise the level of access beyond the user running the Trojan. If successful, the Trojan can operate with increased privileges.
Install viruses
Install other Trojans

The Following Tips Will Help The User To Minimize Virus Risk:

If the users are truly worried about traditional (as opposed to e-mail) viruses, they should be running a more secure operating system like UNIX. One should never hear about viruses on these operating systems because the security features keep viruses (and unwanted human visitors) away from the hard disk.
If the users are using an unsecured operating system, then buying virus protection software is a nice safeguard. Some popular anti virus programs include:
•McAfee Virus Scan
•Norton Anti Virus
•Virex
•PC—cillin
•Avast!
•AVG Anti Virus System
Automatic protection of anti-virus software should be turned on at all times.
The users should perform a manual scan (or schedule a scan to occur automatically) of their hard disks weekly. These scans supplement automatic protection and confirm that the computer is virus-free.
Scan all floppy disks before first use.
Disable floppy disk booting — most computers now allow the user to do this, and that will eliminate the risk of a boot sector virus coming in from a floppy disk accidentally left in the drive.
The users should Enable Automatic Update option of their anti-virus software in order to update their virus definition files.
Creation and maintenance of a rescue disk should be done by the user in order to facilitate recovery from certain boot viruses.
Periodic backups of the hard disk should be done.
Users’ should buy legal copies of all software they use and make write-protected backups.
 Email messages and email attachments from unknown people should not be opened. Attachments that come in as Word files (.DOC), spreadsheets (.XLS), images (.GIF and .JPG), etc., are data files and they can do no damage (noting the macro virus problem in Word and Excel documents mentioned above). A file with an extension like EXE, COM or VBS is an executable, and an executable can do any sort of damage it wants. Further it should be verified that the “author” of the email has sent the attachments. Newer viruses can send email messages that appear to be from a person user know.
The potential users should make sure that Macro Virus Protection is enabled in all Microsoft applications, and they should never run macros in a document unless they know specifically the functionality of the macros.
Appropriate Passwords should be assigned to the shared network drives.

Things that are not viruses!

Joke programs
Joke programs are not viruses and do not inflict any damage. Their purpose is to frighten their victims into thinking that a virus has infected and damaged their system. For example, a joke program may display a message warning the user not to touch any keys or else the computer’s hard disk will be formatted.

Droppers
A dropper is a program that is not a virus, nor is it infected with a virus but when run it installs a virus into memory on to the disk, or onto a file. Droppers have been written sometimes as a convenient carrier for a virus and sometimes as an act of sabotage.

Hoaxes
There must be very few people on email who haven’t received a chain letter with the subject line warning of a virus doing the rounds. These are often hoaxes and meant to scare people and have fun at their expense. The warnings encourage the recipient of the e-mail to pass the warning to the netizens and thus create an unnecessary furor, besides clogging mailboxes, as it usurps an air of credibility.

Methodology of virus detection applied by antivirus softwares:

Three main methods exist for detecting viruses: integrity checking (also known as checksumming), behavior monitoring and pattern matching (scanning).

Integrity checking
Antivirus programs that use integrity checking start by building an initial record of the status (size, time, date, etc.) of every application file on the hard drive. Using this data, checksumming programs then monitor the files to see if changes have been made. If the status changes, the integrity checker warns the user of a possible virus.
However, this method has several disadvantages, the biggest being that false alarms are altogether too common. The records used by checksumming programs are often rendered obsolete by legitimate programs, which, in their normal course of operations, make changes to files that appear to the Integrity checker to be viral activity. Another weakness of integrity checking is that it can only alert the user after a virus has infected the system.

Behavior monitoring
Behavior Monitoring programs are usually terminate and stay resident (TSR) and constantly monitor requests that are passed to the interrupt table. These programs are on the lookout for activities that a virus might engage in–requests to write to a boot sector, opening an executable program for writing, or placing itself resident in memory. The behavior these programs monitor is derived from a user-configurable set of rules.

Pattern matching
Using a process called “pattern matching,” the anti-virus software draws upon an extensive database of virus patterns to identify known virus signatures, or telltale snippets of virus code. Key areas of each scanned file are compared against the list of thousands of virus signatures that the anti-virus software has on record.
Whenever a match occurs, the anti-virus software takes the action the user has configured: Clean, Delete, Quarantine, Pass (Deny Access for Real-time Scan), or Rename.

Self Defense Mechanisms Evolved By Viruses

Virus authors of course wish that their child successfully lives. For this reason there are many viruses outfitted with some self-defense mechanisms against anti virus systems.

Passive Defense :
Viruses use a variety of methods to hide themselves from antivirus programs. Passive defense uses programming methods which make analysis of the virus more difficult, e.g. polymorphic viruses which were developed to counter scanners looking for constant strings of virus code.
Today antivirus systems are capable of analyzing polymorphic code and searching for virus identifiers in the decrypted body. The virus authors reacted by making the encryption too complex for antivirus software to unravel, thus mistaking it for a clean program.

Active Self-defense :
Viruses actively defend themselves by protecting their own code or by attempting to damage antivirus software. A simple method is to locate antivirus software databases and amend or delete them.
More sophisticated resident viruses use stealth techniques. When they detect a request to use an infected file, they can temporarily “clean” it or report its original (uninfected) parameters. They can monitor which programs are being executed and react if it is antivirus software. The list of such reactions is endless. Usually, the execution of the antivirus program is refused, but it could be erased (often accompanied by a bogus error message) or the virus suspends its activities while it runs. There are occasionally extremely ‘clever’ viruses which modify the code of a specific AV program to partially disable it.
There are very rare viruses which consider an attempt to run an anti-virus program as arrogant and immediately reply with some revenge action – for example hard disk formatting.

Trap
A trap is the most malicious form of self-defense and works as follows. Although the user’s computer is infected but everything appears to work correctly. Once the user discovers the virus and removes it things get complicated – programs no longer run properly or the hard disk may become inaccessible even when booting from a clean system diskette.
The best known trap virus is One_Half. It continuously encrypts the data on a hard disk (two tracks on every boot). If it is removed from the partition sector before data files are decoded then some files will become inaccessible. At this stage the situation is serious but recovery of the data is still possible. However, if the user runs a disk utility (Scandisk etc.) to repair the damage then the data will almost certainly be lost forever.
These utilities are designed to repair relatively minor damage to file system and do not recognize the encrypted data.

REFERENCE:

1. Mary Landesman “What is a virus?”

http://antivirus.about.com/cs/tutorials/a/whatisavirus.htm

2. NetGuide “What are computer viruses? “–

http://www.netguide.co.nz/knowhow/tutorials/print.php?iid=38

3. Marshall Brain “How Computer Viruses Work”
http://www.Howstuffworks How Computer Viruses Work.htm
4. AVG Anti Virus Free Edition Help
Developed by Grisoft Inc
5. Norton Anti-virus Help
Developed by Symantec Corporation
6. Trend Micro PC-cillin Help
Developed by Trend Micro Inc
7. Peter Norton “Computer Viruses”
Introduction to Computers, Tata McGraw Hill Co:
8. Dr.Solomon ”About Viruses” &”Virus Prevention”
Dr.Solomon’s Virus Encyclopedia, Dr.Solomon’s Software Ltd.
9. C.A.Schmidt ”Virus”
The Complete Computer Upgrade And Repair Text Book,Dreamtech
10. S.Jaiswal “Virus Detection And Elimination”
Information Technology Today, Galgotia Publication Pvt. Ltd.

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