malwareMalware (malicious software) may be considered any software designed to infiltrate or damage a computer system. The expression is a general term used by computer professionals to indicate a variety of hostile, intrusive, or annoying software or program codes. In law, these types of software are sometimes known as a Computer Contaminants.

Software is considered “malicious” based on the perceived intent of the creator rather than any particular features.

Malicious software includes computer viruses, worms, trojan horses, most rootkits, spyware, dishonest adware, and other surreptitious and unwanted software.

Some malware contain routines to defend against removal – not merely to hide themselves, but to repel attempts to remove them. For example, the software starts a number of processes which monitor one another and restarts any process which is killed off by the operator.

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