Botnets revived, spam back to prior level

Spam levels could take an upwards spike after researchers detected a malicious network of computers designed to push out junk mail and malware was brought back to life Tuesday. The Srizbi botnet, comprising more than half a million PCs, was deemed responsible for approximately 40 to 50 percent of the world’s spam. Up until recently, security experts believe that Srizbi was completely defunct after botnet was knocked offline two weeks ago as part of a collaborative effort within the security community. Now that Szribi is partially revived, it is anticipated to spew out malicious content at alarming rates, experts say.

According to MessageLabs, now part of Symantec, the spike in spam levels was only at 37 percent of what they were before Internet Service Provider McColo was disconnected from upstream provider Hurricane Electric, who disassociated with the provider because of its connection to some of the world’s largest malicious botnets. McColo’s shut down came shortly after the release of a scathing report by a group of notable security researchers and vendors lambasting McColo for hosting numerous Web sites known to cater to child pornography and malware. Spam levels experienced a sharp drop — anywhere from 60 to 80 percent– in the weeks following McColo’s takedown. However experts say that spam levels are steadily returning to “normal” levels, rising to two thirds of what they were before the McColo shut down as the spammer reconnected with other providers.

Source: CRN