Sobig is back, badder than ever

Tuesday, 19 August 2003, 3:49 PM EST

The firm has given it a high-level alert status as it appears to be spreading very vigorously.

The new worm, codenamed W32/Sobig.F-mm, appeared on Monday, according to the firm. All copies came from the U.S.. So far, the worm has been active in the U.S., Denmark and Norway. Anecdotal evidence suggests that it has also spread to the Asia-Pacific.

"Initial analysis would suggest that Sobig.F is a mass-emailing virus that is spreading very vigorously. Sobig.F appears to be polymorphic in nature and the email from. The address is also spoofed and may not indicate the true identity of the sender," according to a MessageLabs statement.

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