Published at LXer:

Long before the end of the twentieth century, the antivirus guys were fighting whack-a-mole battle — and that was in the days before the bad guys had the sophistication to write malware that could hide, constantly rewrite itself to avoid matching a definition, or to return seemingly by magic after being deleted. There is just too much malware being created for even a hard drive loaded with definitions to handle. For a while it seemed as if heuristics were the answer, until it became obvious that much of what we do on our computers looks like bad behavior to a halfway effective heuristics program.

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