Grum is the third-largest botnet in the world, sending out about 18 billion spam emails per day. Grum was brought to its virtual knees this week when security researchers put enough pressure on Internet service providers (ISPs) to take Grum’s servers in the Netherlands, Russia, Ukraine and Panama offline. This shutdown created a massive decrease in the number of Grum IP addresses sending spam, from 120,000 IP addresses, to a little over 21,500.
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