By Greg McNevin

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According to the net security firm Marshall, a mere six botnets are responsible for a whopping 85 percent of the world's spam in February.

Out of this six, the Srizbi and Rustok botnets are heavyweights, sending out 39 and 21 percent of of messages respectively.

Marshall notes that Srizbi is quite formidable as it is "extremely stealthy, operating in full kernel mode, which, among other things, allows it to hide its network activities and bypass sniffer tools." …

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Keywords: botnet bot net