Got yourself a copy of Windows 7 using BitTorrent instead of the official release candidate? Well, it is likely you got some extra features in your copy. According to researchers at Damballa, attackers hid a Trojan inside of pirated copies of the operating system and began circulating them on BitTorrent sites. Damballa reported that it shut down the botnet's command and control server May 10, but by that time infection rates had risen as high as 552 users per hour. Blocking infections is tricky, as many anti-virus tools do not yet support Windows 7 and the operating system is infected before the tools can even be installed, according to Damballa.