Researcher: Worm infects 1.1M Windows PCs in 24 hours

It would make ‘one big badass botnet,’ says Finnish security company

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.

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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