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Malicious [[programmer]]s have sought to protect their polymorphic code from this virus-scanning strategy by rewriting the unencrypted decryption engine each time the virus or worm is propagated. Anti-virus software uses sophisticated pattern analysis to find underlying patterns within the different mutations of the decryption engine, in hopes of reliably detecting such [[malware]].
The first known polymorphic virus was written by Mark Washburn. The virus, called [[1260 (computer virus)|1260]], was written in 1990. A more well-known polymorphic virus was invented in 1992 by the [[Bulgarians|Bulgarian]] [[security cracking|cracker]]
== Example ==
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