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Microsoft has continued its assault on the Kelihos botnet, naming a former IT security professional as the controller of the malicious network.
An amended complaint US District Court for the Eastern District of Virginia, Microsoft alleged that Russian Andrey Sabelnikov was running the botnet.
In the complaint, Microsoft said Sabelnikov was working on a freelance basis for a software development and consulting firm, and had previously been a project manager at an anti-virus provider.
Thousands of computers are still infected with its malware.
The Kelihos botnet was shut down last year, but Microsoft has continued to hunt for the perpetrators and have them prosecuted.
Microsoft had previously accused Dominique Piatti, a Czech man running the dotFREE domain hosting company, claiming his business was registering subdomains used to operate Kelihos.