White Papers for Sarbanes-Oxley (SOX)

A Multilayer Approach to Preventing Viruses

IronPort

As virus writers create increasingly sophisticated malicious code and find ever more effective methods to propagate,enterprises find themselves scrambling to keep their networks,servers,and end-user computers safe from new threats. Traditional anti-virus applications work by searching the contents of files and looking for a recognized pattern of data (a “signature ”)that is the virus program itself.However,virus writers have come up with various methods to escape detection by changing their programs,making it harder for virus scanners to recognize them as viruses.Today ’s viruses are either polymophic or metamorphic and can actually change themselves as they propagate. The increasing sophistication of malicious code is therefore making pattern recognition technologies less and less effective.

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