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New Sober Worm Poses As Microsoft Patch: Page 2 of 2

Sober.d isn't the first worm to pose as a security update from Microsoft. Last year's Swen outbreak, for instance, successfully used this trick to infect thousands of computers.

Anti-virus firms reacted by updating their virus definitions to take the new Sober into account, and by bumping up alert levels. Network Associates, for instance, tagged Sober.d as a "medium" threat, while rival Symantec labeled it as only a "2" in its 1 through 5 scale.