That changed when more and more programmers became acquainted with computer virus programming and created viruses that manipulated or even destroyed data on infected computers.Before internet connectivity was widespread, computer viruses were typically spread by infected floppy disks.Indeed, the initial viruses re-organise the layout of the sections, or override the initial portion of section in order to jump to the very end of the file where malicious code was located and then, later on, go back to resume the execution of the original code.This was a very specific pattern, not used at the time by any legitimate software, that initially represented a very nice heuristic to catch where something was suspicious or not.Possibly, the first publicly documented removal of an "in the wild" computer virus (i.e.the "Vienna virus") was performed by Bernd Fix in 1987.In Germany, Tjark Auerbach founded Avira (H BEDV at the time) and released the first version of Anti Vir (named "Luke Filewalker" at the time). Vesselin Bontchev released his first freeware antivirus program (he later joined FRISK Software).
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There are competing claims for the innovator of the first antivirus product.
Later, in time, other kind of more advanced heuristics have been added, such as: suspicious sections name, incorrect header size, wildcards and regular expressions and partial pattern in-memory matching.
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