Suprise to see symantec fails on this one.They have a big reputation to hold up..
The SirCam worm has revealed weaknesses in anti-virus protection relied on by many firms as a first line of defence against viral infection.
Norton Antivirus for Gateways fails to see email with attachments contaminated by the virus even if the correct settings have been applied and the latest versions of virus-identfying signature files have been downloaded.
When SirCam spreads itself by email the messages generated have an invalid or mangled MIME-header because of which Symantec's products don't recognise that an email has an attachment.The same bug in Symantec's software means Norton Antivirus also fails to detect SirCam with its POP email filter.
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Have know for years. Symantec doesn't make a good viral scanner, only a good Userinterface.
The full implementation of heuristic scanning can be found at www.kaspersky.com
I'm surprised about what they claim on this article.
The network of my company is protected by NAV for Gateways and every infected email that had to go to my attention was perfectly cleaned by the AV scanner! :7