Intro To Computer Virus

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of which hide and replicate.

The first of these is the Trojan Horse programs, the name of which comes from the Greek legend that told how Greek soldiers gained entry to the city of Troy in a giant, hollow wooden horse and thus captured the city, ending the Trojan War. Though not technically a virus it is still dangerous and could cause permanent damage to your operating system. A Trojan Horse program is a program disguised as a game, a utility or an application. When run, a Trojan Horse will do something devious to your computer while appearing to do something useful, such as deleting every file beginning with the letter 'H' while you are running a word processing program.

A logic bomb is a program that lies dormant in a computer's memory until certain conditions are met, such as a date is reached, a certain program is activated, or a combination of letters is typed. An example of this is the 'Bomber' virus. Every August 31st this virus activates, emits a beep and writes ...

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.COM files. After 401 boots the virus overwrites all sectors on the first and second hard drives with gibberish as it displays the message "Campana Anti-TELEFONICA (Barcelona)." While it overwrites your hard drive it places a boot sector version of itself on your hard drive.

Multipartite Viruses that affect both the start -up procedure and program files. The "Junkie" virus also infects .COM files and contains the encrypted messages "Sweden 1994" and "The Junkie Virus - written in Malmo". It actually contains no intentionally damaging code, but corrupts .COM files over 64 kilobytes and disables the anti-virus included with MS-DOS 6.

and finally
Macro Viruses that can infect ...

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