Microsoft software bug linked to 'Duqu' virus[ Tue, 1 Nov 2011 21:47:19 GMT ]Microsoft said hackers exploited a previously unknown bug in its Windows operating system to infect computers with the Duqu virus, which some security experts say could be the next big cyber threat. "We are working diligently to address this issue and will release a security update for customers," Microsoft said on Tuesday in a short statement.