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A computer virus [1] is a type of malware that, when executed, replicates itself by modifying other computer programs and inserting its own code into those programs. [2] [3] If this replication succeeds, the affected areas are then said to be "infected" with a computer virus, a metaphor derived from biological viruses. [4]
To combat computer viruses and other malicious software, many security advisory organizations and anti-virus software developers compile and publish virus lists. When a new virus appears, the rush begins to identify and understand it as well as develop appropriate counter-measures to stop its propagation.
Appearance of Lehigh virus (discovered at its namesake university), [20] boot sector viruses such as Yale from the US, Stoned from New Zealand, Ping Pong from Italy, and appearance of the first self-encrypting file virus, Cascade. Lehigh was stopped on campus before it spread to the "wild" (to computers beyond the university), and as a result ...
They have been likened to biological viruses. [3] An example of this is a portable execution infection, a technique, usually used to spread malware, that inserts extra data or executable code into PE files. [34]
Dismissing it would reboot the computer and then display the message again. Klez: October 2001 Koobface: December 2008 Targeted MySpace and Facebook users with a heading of "Happy Holidays". Leap-A: Oompa-Loompa Trojan worm February 14, 2006 Most known for being the first virus targeting Mac computers. Morris: November 2, 1988 Robert Tappan Morris
In computing, a Trojan horse (or simply Trojan) is a malware that misleads users of its true intent by disguising itself as a normal program. The term is derived from the ancient Greek story of the deceptive Trojan Horse that led to the fall of the city of Troy.