W32.Flamer is a worm that spreads through removable drives. It also opens a back door and may steal information from the compromised computer. Highly sophisticated and discreet, the Flamer threat contains code that is on par with Stuxnet and Duqu in complexity. It appears to be the work of a well-funded group targeting Eastern Europe and the Middle East.
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Security Response Blog 1
Security Response Blog 2
Flamer: Urgent Suicide 6/6/12