How Do The PC Viruses Work?

How do the PC viruses work?

So, what is PC virus? Imagine some clerk and his work place with a table and phone and copier with some appliances on it. Some cabinet with files and documents is standing nearby. All files contain certain instructions a clerk has to follow. So, every day our clerk takes out another file and works with it either calculating salary or managing the incoming documents.

A clerk works day by day and some evil-wisher sticks into his file some additional page with instructions where a clerk is advised to copy this page and stick it into all other files. With time every file would have a copy of this original page.

Besides instructions on distribution this additional page may contain some other advices either about burning some randomly picked file or about making a bank transfer to specified account.

Now, instead of this clerk imagine the central processing unit and instead of cabinet your hard drive. The files are actually the files of your software. And the additional page would be a virus.

To be more specific a virus is a self distributing in informational environment program code that enters executable program files and distributes itself through the diskettes and hard drives boot-sectors.

There are several viruses being distributed through Windows MS Word and Excel documents. Besides the mentioned ones there are several viruses that infect the command files with BAT extension. The progress in virus world never stops for hundreds programmers do their job creating new monsters.

Unfortunately most viruses are not only about self duplication and distribution for they can perform either relatively safe or in contrast destructive actions.

The viruses action is determined by the viruses activation and performing certain operations on timely basis. The viruses can show on the screen some strange signs, “drop down” the symbols, reload your system, slow down PC processes, play melodies, delete files and catalogues and erase randomly picked hard drives sectors, etc.

There are some “useful” viruses. For example some virus when infecting files compresses them allowing you to have more free space on hard drive. It works like DIET program just without the user’s authorization. Still, even the “useful” viruses may be dangerous for effects as unexpected PC reload or buzzing may be taken by users as their PCs hardware malfunction.

Though don’t hurry up to call for technicians or open a computer on your own. First completely diagnose your computer using all antivirus tools you have. Presently there are thousands of viruses and their modifications but most of them may be classified as:
-the viruses integrated in files;
-the viruses infecting hard drives boot-sectors.

Also, there are lots of viruses that may be included in both groups. These are the combined viruses and may be transmitted infecting the files and the boot-sectors at the same time.

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