Tricky new malware challenges vendors

A tricky malicious program has become more prevalent in spam, but experts don't know what its creators plan to do with it. Many vendors are rating the malware - called "Warezov," "Stration" and "Stratio" - as a low risk. But they also say that it is tricky to deal with.

The malware is a mass-mailing worm that affects machines running Microsoft Corp.'s Windows OS. When the malware infects a computer -- usually after the user has opened an attachment containing the worm in a spam e-mail -- it sends itself out again to other e-mail addresses found on the computer. The code is then capable of downloading new versions of itself as frequently as every 30 minutes from a batch of Web sites.

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