The FBI warned U.S. businesses that hackers have used malicious software to launch destructive attacks in the United States, following a devastating cyberattack last week at Sony Pictures Entertainment. The five-page, confidential "flash" warning issued to businesses late on Monday provided some technical details about the malicious software that was used in the attack, though it did not name the victim. An FBI spokesman declined comment when asked if the software had been used against the California-based unit of Sony Corp.
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