an action used by some viruses to point a command to a different location. Often this different location is the address of the virus and not the original file or application.

spam for instant messaging.

a legitimate, non-replicating program designed to display ads to the end user, often based on monitoring of browsing habits.

Anti-antivirus viruses attack, disable, or infect specific anti-virus software.

Anti-virus software scans a computer's memory and disk drives for viruses. If it finds a virus, the application informs the user and may clean, delete, or quarantine any files, directories, or disks a [..]

An armored virus tries to prevent analysts from examining its code. The virus may use various methods to make tracing, disassembling, and reverse engineering its code more difficult.    [..]

a feature in some anti-virus software to automatically scan files and documents as they are created, opened, closed, or executed.    

A backup is a duplicate copy of data made for archiving purposes or for protection against damage and loss.

Combine the characteristics of viruses, worms, Trojan Horses, and malicious code with server and Internet vulnerabilities to initiate, transmit, and spread an attack.

Derived from the word "robot," a bot is a software program that performs repetitive functions, such as indexing information on the Internet.