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The steadily increasing number of malware variants is becoming a significant problem, clogging the input queues of automated analysis tools and polluting malware repositories. The generation of malware variants is made easy by automatic packers and polymorphic engines, which can produce many distinct versions of a single executable using compression and encryption. Malware analysis tools and repositories rely on executable digests (hashes) for indexing malware programs and discarding duplicates. Unfortunately, these executable digests are different for each malware variant. Thus, a great deal of time and resources are wasted by analyzing, running, and storing numerous instances of almost identical programs.
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