Stuxnet worm can re-infect scrubbed computers

A security researcher today revealed yet another way that the Stuxnet worm spreads, a tactic that can re-infect machines that have already been scrubbed of the malware.
Iranian officials say Stuxnet has infected at least 30,000 of the country's Windows PCs.
The worm targets Windows PCs that oversee industrial-control systems, called "SCADA" systems.

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