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The company's virus-filtering system scanned 800 e-mail clients and suspected that each e-mail contained an extra 12KB of physical storage.
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Attached to each e-mail is very different from the structure of some prior worms, especially of the Mydoom variants; They contain a mail engine, a list of domain names related to Undernet.org, and some code associated with a chat room.
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At present, MessageLabs is thoroughly analyzing the source code of the worm. The company also thinks it is likely that the author of the suspected worm is preparing for a denial-of-service attack.
