add-on virus

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The most common form of virus. It functions by adding program code to the code of the computer which has been infected. It usually alters the start-up file of the infected computer so that the virus code is executed first before the normal code which starts up the computer. Such a virus is activated when the computer is first booted up after infection; the virus code then carries out some potentially destructive act such as deleting important files.

Subjects: Computing.

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