It’s a common belief that virus scanners provide adequate protection against an attack. While I support my customers having an updated virus scanner in place, a Penetration Test provides another level of protection.
There are two reasons a virus scanner is not sufficient protection against a hack.
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Criminal hackers test their hack against commercial virus scanners to make sure their hack is not detected.
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Most virus scanners use pattern matching to detect known viruses, not new ones. Hackers develop new ones daily.