ZDNet AnchorDesk: Is your antivirus app working? Are you sure?

Is your antivirus app working? Are you sure?:
"You have a desktop antivirus app installed now, and you know the signature file subscription is current with the vendor, but still you're seeing viruslike symptoms or perhaps you actually know that you have a virus. Since the first of this year, many new viruses have been shutting down antivirus and firewall apps, or, in other cases, disabling the software's automatic update feature, leaving your system vulnerable to future attack.

It's actually an old trick. The virus MTX, for example, released in 2000, blocks access to antivirus software Web sites. But these recent antivirus-disabling attacks are more effective because of their sheer volume: with some 30-odd variations of Bagle appearing within a 10-week period, each one better than the last, you might have been hit and not even realized it."

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