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In the same period, in Hungary, also Virus Buster was founded (which has recently being incorporated by Sophos).
Indeed, the initial viruses re-organized the layout of the sections, or overrode the initial portion of section in order to jump to the very end of the file where malicious code was located—only going back to resume execution of the original code.
This was a very specific pattern, not used at the time by any legitimate software, which represented an elegant heuristic to catch suspicious code.
the "Vienna virus") was performed by Bernd Fix in 1987.
Early heuristic engines were based on dividing the binary in different sections: data section, code section (in a legitimate binary, it usually starts always from the same location).
Other kinds of more advanced heuristics were later added, such as suspicious section names, incorrect header size, regular expressions, and partial pattern in-memory matching.