Jeremy Kirk, IDG News Service
Monday, December 04, 2006 07:00 AM PST

The social networking site MySpace.com is under what one computer security analyst calls an "amazingly virulent" attack caused by a worm that steals log-in credentials and spreads spam that promotes adware sites.

The worm is infecting MySpace profiles with such efficiency that an informal scan of 150 found that close to a third were infected, said Christopher Boyd, security research manager at FaceTime Communications.

MySpace, owned by News Corp., is estimated to have at least 73 million registered users.

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