Polymorphic viruses change their code in fundamental ways with each replication in order to avoid detection by anti-virus scanners. This may mean changing the encryption routine, the sequence of instructions, or other such changes in the behaviour of the virus. This article is the first of a two-part series that will offer a brief overview of the use of polymorphic strategies in macro viruses. This installment will focus on some early examples of polymorphic techniques.
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