Meet Mask, posssibly the most sophisticated malware campaign ever seen

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Calling it the most sophisticated malware-driven espionage campaign ever discovered, researchers said they have uncovered an attack dating back to at least 2007 that infected computers running the Windows, OS X, and Linux operating systems of 380 victims in 31 countries.

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Story added 11. February 2014, content source with full text you can find at link above.