E-mail security firm IronPort said spam levels fell by roughly 66 percent as of Tuesday evening.Spamcop.net, another spam watch dog, found a similar decline, from about 40 spam e-mails per second to around 10 per second.
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Multiple security researchers have recently published data naming McColo as the host for all of the top robot networks or "botnets," which are vast collections of hacked computers that are networked together to blast out spam or attack others online. These include SecureWorks, FireEye and ThreatExpert.Reports by Joe Stewart, director of malware research for Atlanta-based SecureWorks, said that these known botnets: Mega-D, Srizbi, Pushdo, Rustock and Warezov, "have their master servers hosted at McColo.