polymorphic virus


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polymorphic virus

A virus that changes its binary signature each time it infects a new file. Using a random number generator, a unique key can be created to encrypt each virus download that self extracts and executes when opened. Without an identifiable pattern to match, the only way to discover a polymorphic virus is by its actions (see behavior detection). See self-extracting file.

Also called a "stealth virus," hundreds of thousands of polymorphic Windows viruses are discovered every day. The actual number of antivirus families that generate that many files is perhaps a few thousand. See virus and antivirus program.
References in periodicals archive ?
in a VB report on the topic, a polymorphic virus encrypts the body of the code within infected files.
Norton AntiVirus features numerous virus detection technologies to detect new and unknown viruses, including Bloodhound and Bloodhound Boot heuristic technology, Striker polymorphic virus detection technology, and the Macro Virus Protection (MVP) system.
Symantec's exclusive Striker technology, a next generation polymorphic virus detection engine, is behind Norton AntiVirus' flawless detection of polymorphic viruses.

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