Common types of viruses

There are a variety of computer virus available now.Most common types of viruses are mentioned below:

Resident Viruses: This type of virus is a permanent which dwells in the RAM memory.

Direct Action Viruses : The main purpose of this virus is to replicate and take action when it is executed.

Overwrite Viruses : Virus of this kind is characterized by the fact that it deletes the information contained in the files that it infects, rendering them partially or totally useless once they have been infected.

Boot Virus : This type of virus affects the boot sector of a floppy or hard disk.

Macro Virus : Macro viruses infect files that are created using certain applications or programs that contain macros.

Directory Virus : Directory viruses change the paths that indicate the location of a file.

Polymorphic Virus : Polymorphic viruses encrypt or encode themselves in a different way (using different algorithms and encryption keys) every time they infect a system.

File Infectors : This type of virus infects programs or executable files (files with an .EXE or .COM extension).

Companion Viruses : Companion viruses can be considered file infector viruses like resident or direct action types.

FAT Virus :The file allocation table or FAT is the part of a disk used to connect information and is a vital part of the normal functioning of the computer.

Worms : A worm is a program very similar to a virus; it has the ability to self-replicate, and can lead to negative effects on your system and most importantly they are detected and eliminated by antiviruses.

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