Worm Infects 9 Million Windows PCs

Make sure you have KB958644 installed.

Early Friday, the Finnish firm revised its estimate of the number of computers that had fallen victim to the worm, and explained how it came to the figure. “The number of Downadup infections [is] skyrocketing,” Toni Koivunen, an F-Secure researcher, said in an entry to the company’s Security Lab blog . “From an estimated 2.4 million infected machines to over 8.9 million during the last four days. That’s just amazing.”

On Tuesday, Koivunen put the number of infected systems at 2.4 million, then updated the estimate Wednesday to 3.5 million, an increase of 1.1 million in just 24 hours .

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