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 Wednesday, January 21, 2009
Windows virus infects 9m computers

The number of Windows computers infected with the new "downadup" worm – also known as "Conficker" and "Kido" – has exploded to almost 9 million worldwide, from roughly 2.4m last Thursday, according to the computer security company F-Secure.

The growth in the number of infected machines – which the company's researchers called "just amazing" – makes it one of the worst malware outbreaks of the past five years. The principal targets are corporate Windows servers belonging to small businesses who have not installed security updates released by Microsoft last October. F-Secure estimates that a third of all potentially vulnerable systems have not had the update.

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