Notorious Kraken botnet rises from the ashes

With help from Eboc gang

The Kraken botnet, believed by many to be the single biggest zombie network until it was dismantled last year, is staging a comeback that has claimed almost 320,000 PCs, a security researcher said.

Since April, this son-of-Kraken botnet has infected an estimated 318,058 machines – about half as big as the original Kraken was at its height in the middle of 2008, according to Paul Royal, a research scientist at the Georgia Tech Information Security Center.

Like its predecessor, the new botnet is a prodigious generator of spam, with a single machine with average bandwidth able to send more than 600,000 junk mails per hour.  Curiously, the malware spawning the new zombie network is being spread by a separate botnet that uses the Butterfly framework, a for-hire software kit for infecting Windows PCs. The collaboration between operators of the two networks is generating some head-scratching among researchers. […]

The group performing the mass installations has been dubbed Eboc because that’s the user name they use to sign into a copy-protection system designed to curb the pirating of the botnet software according to Pedro Bustamante, a senior research advisor at anti-virus provider Panda Security. To evade detection, they use as many as 1,200 unique malware variants. One widely used strain was flagged by just 50 per cent of AV last week, according to this VirusTotal analysis.

http://www.theregister.co.uk/2010/06/29/kraken_botnet_resurgence/

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