In this quarter, we detected nearly twelve million new IP addresses operating as “zombies,” computers under the control of spammers and others. This is a signifcant increase over the levels from the last quarter of 2008, with an increase of nearly 50 percent. The third quarter of 2008 also posted a record number of new zombies, but it was exceeded this quarter by one million. And although the spam volume levels have not yet recovered from the McColo shutdown, the activity level of new zombies indicates that the spammers are working hard to regain the infrastructure lost and that volumes will return to previous levels sometime soon.
http://www.mcafee.com/threatsreport
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