Abstract
A Windows worm known as W32.Sobig.B (but also as the Palyh and the Mankx worm) is arriving in the form of an attachment in messages that appear to be from Microsoft support. Sobig.B creates and then sends messages to addresses it finds in address books of systems it infects. The indicated address of the sender is support@microsoft.com. Subject lines vary, but 'Screensaver', 'Cool Movie', 'Re: My application', 'Approved (Ref: 38446-263)', and 'Your password' are frequently used. The name of the attachment that contains this worm has a .pif file extension, but the actual name varies. 'movie28.pif', 'screen_temp.pif', 'doc_details.pif', 'ref-394755.pif', and 'password.pif' are common attachment names. If the recipient of an infected message that Sobig.B sends opens the attachment, the recipient's system becomes infected. Once the system is infected, Sobig.B creates a Registry entry that causes this worm to be started up whenever the infected system boots.
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