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A companion virus is a complicated computer virus which, unlike traditional viruses, does not modify any files. Instead, it creates a copy of the file and places a different extension on it, usually .com. This unique quality makes a companion virus difficult to detect, as anti-virus software tends to use changes in files as clue.
The companion virus is an old type of virus that was more prominent during the MS-DOS era. It is propagated mostly through human intervention.
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