400,000-strong 'Kraken' botnet has infiltrated 50 Fortune 500 companies -- and now usurps Storm as world's biggest botnet

A new botnet twice the size of Storm has ballooned to an army of over 400,000 bots, including machines in the Fortune 500, according to botnet researchers at Damballa.

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http://isc.sans.org/diary.html?storyid=4250
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