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Z0mbie
29a [#8
March 2004

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Abstract

Almost all trojans and viruses are detected using simple signatures. Which means that simple crc is calculated on the entire file, or on some parts of the code being checked. Using simple length disassembler and some simple rules, it is possible to analyze an arbitrary executable file and change some instructions in it, so that it will run the same as before, but file's checksum will be changed.

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