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Sony Hackers Snooped for Months Before Planting Virus

Corrected

Hackers who broke into Sony Corp.’s Hollywood unit probably spent months collecting passwords and mapping the network before they committed a last act of vandalism, setting off a virus that wiped out data and crashed the system in 10 minutes.

Trend Micro Inc. arrived at these conclusions after running simulations on a copy of the virus that struck Sony Pictures Entertainment’s computers. The Tokyo-based developer of security software declined to reveal where it got the malware.