http://www.virusbtn.com/virusbulletin/archive/2011/08/vb201108-relock
Relock-based vulnerability in Windows 7
University of Verona, Italy
Through analysis of an old piece of malware, researchers at the University of Verona have found unexpected vulnerabilities in Windows 7 and have demonstrated that with some slight tweaks, W32/Relock will run smoothly on the latest OS.