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The software giant and Andrey N. Sabelnikov, who admits he wrote the code used in malware that infected thousands of computers, reach a settlement in related lawsuit.
Researchers use specially crafted code to direct infected computers to their servers instead of servers run by the criminals who have been using the botnet to distribute spam.
New variants resurrect the malware four months after Microsoft and Kaspersky Lab took down the original, which was capable of sending nearly 4 billion spam e-mails each day.
St. Petersburg, Russia-based Andrey N. Sabelnikov says he is "absolutely not guilty" of participating in the creation of the huge spam network that Microsoft shut down last September.
Software giant accuses a St. Petersburg, Russia, resident of writing malware to control and nurture the botnet, which infected 41,000 computers worldwide.
A Czech resident is accused of operating a botnet that infected tens of thousands of computers, serving spam and harvesting data. This is the third botnet Microsoft has taken down using the same legal and technical measures.
Provider of free domains has agreed to delete or to transfer to Microsoft all subdomains the software giant had said were tied to the Kelihos botnet.