Rustock--which in March was knocked offline by federal authorities and Microsoft--was able to send some 30 billion spam messages a day, such as for phony Pfizer prescription drugs and fake Microsoft lottery scams. FireEye, researchers at the University of Washington, Pfizer, the Dutch High Tech Crime Unit, and the Chinese CERT all assisted in the operation to take down the botnet, which had an army of some 1.6 million machines worldwide at its peak. And there are still some 700,000 machines infected with the botnet's malware, according to a recent report from Microsoft.
Richard Boscovich, senior attorney for Microsoft's digital crimes unit, announced today that the company had decided to supplement its civil discovery efforts with the cash reward. Last month, Microsoft published notices in two Russian newspapers in an effort to alert the Rustock operators of the civil lawsuit against them. The reward was a way to turn up the "heat as a result of the evidence we have secured during the discovery process," Boscovich said in response to an inquiry from Dark Reading. However, he did not elaborate on just what that evidence might be.
The $250,000 reward is available to anyone offering new information that results in the arrest and conviction of the Rustock operators. Microsoft will be gathering information via email, at email@example.com.
"This reward offer stems from Microsoft's recognition that the Rustock botnet is responsible for a number of criminal activities and serves to underscore our commitment to tracking down those behind it. While the primary goal for our legal and technical operation has been to stop and disrupt the threat that Rustock has posed for everyone affected by it, we also believe the Rustock bot-herders should be held accountable for their actions," Boscovich said in a blog post.
He said the company has gathered "strong evidence" in the case, and that Microsoft continues to help clean up Rustock-infected machines.
Gunter Ollmann, VP of research at Damballa, says a bounty will put pressure on the botnet operators, and on potential informants.
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