Researcher: Worm infects 1.1M Windows PCs in 24 hours

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January 14, 2009 (Computerworld) The computer worm that exploits a
months-old Windows bug has infected more than a million PCs in the
past 24 hours, a security company said today.

Early Wednesday, Helsinki, Finland-based security firm F-Secure Corp.
estimated that 3.5 million PCs have been compromised by the "Downadup"
worm, an increase of more than 1.1 million since Tuesday.

"[And] we still consider this to be a conservative estimate," said
Sean Sullivan, a researcher at F-Secure, in an entry to the company's
Security Lab blog. Yesterday, F-Secure said the worm had infected an
estimated 2.4 million machines.

The worm, which several security companies have described as surging
dramatically during the past few days, exploits a bug in the Windows
Server service used by all supported versions of Microsoft Corp.'s
operating system, including Windows 2000, XP, Vista, Server 2003 and
Server 2008.

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