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To successfully identify the metamorphic viruses oriented from the same base, anti-virus software has adopted the code normalization technique to transform the variations to a more uniform signature representation. Current code normalization technique focuses on the simplification of the arithmetical or logical operators. In this paper, the authors introduce a new technique of generating metamorphic viruses by embedding complicated manipulation functions that cannot be normalized into the malicious executables. Using encryption/decryption functions as an example, they present this evasion strategy that malware writers could employ in the future.
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