Tricky new malware challenges vendors
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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