Essay about Effect of Computer Virus

2009 Words May 10th, 2013 9 Pages
Different Types of Computer Viruses
Computer virus is a software program written with malicious intentions. There are number of computer viruses that can impede the functioning of your computer system. Let us find out the different types of computer viruses.
Did You Know?
In 2010, Stuxnet virus targeted Siemens Industrial Software and Equipment. There are allegations that this virus is a part of a U.S. and Israeli intelligence operation named "Operation Olympic Games" and it hit Iran's nuclear plant Natanz.

Computer virus is a harmful software program written intentionally to enter a computer without the user's permission or knowledge. It has the ability to replicate itself, thus continuing to spread. Some viruses do little but
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This makes it impossible for antivirus software to find them using string or signature searches (because they are different in each encryption). The virus then goes on to create a large number of copies.

Examples: Elkern, Marburg, Satan Bug and Tuareg
Protection: Install a high-end antivirus as the normal ones are incapable of detecting this type of virus.

Companion Viruses

Companion viruses can be considered as a type of file infector virus, like resident or direct action types. They are known as companion viruses because once they get into the system they 'accompany' the other files that already exist. In other words, to carry out their infection routines, companion viruses can wait in memory until a program is run (resident virus), or act immediately by making copies of themselves (direct action virus).

Hideout: These generally use the same filename and create a different extension of it. For example: If there is a file "Me.exe", the virus creates another file named "Me.com" and hides in the new file. When the system calls the filename "Me", the ".com" file gets executed (as ".com" has higher priority than ".exe"), thus infecting the system.
Examples: Stator, Asimov.1539 and Terrax.1069
Protection: Install an antivirus scanner and also download Firewall.

FAT Virus

The file allocation table (FAT) is the part of a disk used to store all the information about the location of files, available space, unusable space,

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