The destructive malware program that the FBI alerted some companies about this week was likely used against Sony Pictures Entertainment, according to technical evidence found by researchers in the program’s code.

Reports surfaced online Nov. 24 that the computer network of Sony Pictures Entertainment, a U.S.-based subsidiary of Sony, was infiltrated by hackers. The company’s employees were reportedly no longer able to use their computers after a message from the attackers, a group called the Guardians of Peace (GOP), was displayed on their screens.

On Monday the FBI sent a confidential five-page alert to a number of private companies about a destructive malware program that can overwrite data on a computer’s hard disk drive, including its master boot record that holds information about partitions.

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