Utilities and industrial manufacturing plants are being targeted by a first-ever control-system malware -- malicious software that can wreak havoc. It's spread by USB devices that rob data from systems using specific Siemens software. The bug -- known as Stuxnet -- is grafting industrial automation layout design and control files. Antivirus software does have the ability to pick up its presence, and Siemens is working on a security update.

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