virus types

Resident Viruses

This is a type of virus that hides in your computer’s RAM memory, controlling and intercepting operations carried out by the system, these are often used to capture passwords and credit card numbers and can corrupt files and programs.

Direct Action Viruses

The main purpose of this virus is to replicate and take action when it is executed. When a specific condition is met, the virus will go into action and infect files in the directory or folder that it is in and in directories that are specified in the AUTOEXEC.BAT file PATH. This batch file is always located in the root directory of the hard disk and carries out certain operations when the computer is booted.

Overwrite Viruses

When this type of virus infects a file, it deletes all of the information contained within that file and then copies itself into it. In other words, these will gut your files and then wear their clothes. Files infected with this type of virus become useless and can’t be recovered without restoring a previous backup.

Boot Virus

This type of virus affects the boot sector of a floppy or hard disk. This is a crucial part of a disk, in which information on the disk itself is stored together with a program that makes it possible to boot (start) the computer from the disk.

Macro Viruses

Certain programs like Microsoft Word, Excel, Access, and Powerpoint have the ability to use small ‘helper’ programs to extend their functionality and automate repetitive tasks. These ‘helper’ programs are known as macros and scripts and are stored in the document files instead of the main program. A macro virus is simply a virus that hides out in these files and waits for you to open them with their respective programs – which then run the virus.