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Of the enormous quantity of malicious programs seen in the wild, most are variations of previously seen programs. Automated program transformation tools i.e., code morphers are one of the ways of making such variants in volume. This paper proposes a Markov chain-based framework for fast, approximate detection of variants of known morphers wherein every morphing operation independently and predictably alters quickly-checked global program properties. Specifically, identities from Markov chain theory are applied to approximately determine whether a given program may be a variant created from some given previous program, or whether it definitely is not.
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