Traditional signature-based antivirus and antispyware programs identify nasty attackers by looking for identifying signatures. These signatures are akin to malware fingerprints; they're the signs that traditional antimalware looks for to recognize malware.
But if you've ever watched CSI, you know that fingerprints are really most useful when they're connected to a known offender in a database somewhere—someone who's never been caught before might not be. Similarly, the problem with the traditional signature-based approach is that it leaves you vulnerable between the time a brand-new threat appears and the time the security vendors develop a signature for it.
Sometimes that window of vulnerability is just a few hours, but all too often it may be days before your security software is capable of recognizing a brand-new threat. Nonsignature Antimalware
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