Band of Botnet Busters Grounds Grum

A joint effort by antimalware company FireEye, law enforcement authorities and other antispam activists has taken down Grum, believed to be the world's third-largest botnet, accounting for nearly 20 percent of worldwide spam. After three days of work, all of Grum's known command and control servers are now dead, according to FireEye's Atif Mushtaq.

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