A Virus is a program that is activated by attaching copies of itself to executable objects. Viruses can reach your computer from other infected computers, via data medium (CD, DVD, etc.) or through a network (local or Internet). There are several types of viruses:
File viruses: File-infecting viruses attack executable programs, such as all files with “.exe” and “.com” extensions.
Script viruses: Script viruses are a subset of file viruses, written in a variety of script languages (VBS, JavaScript, BAT, PHP, etc.). They either infect other scripts (for example, Windows or Linux command and service files), or form a part of multi-component viruses. Script viruses are able to infect other file formats, such as HTML, if the file format allows the execution of scripts.
Boot viruses: Boot viruses attack boot sectors (removable media boot sector or hard disk master boot sector) and set their own loading routines at start-up
Macro viruses: Macro viruses attack documents where other commands (macros) can be inserted. These viruses are often embedded within word processing or spreadsheet applications, since macros are easily inserted into these types of files.
Viruses can also be classified according to the way they perform their action. While direct action viruses perform an action immediately after the infected object is activated, resident viruses stay and work in the computer’s memory.
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