A program implemented by the National Security Agency to help the U.S. and its allies track the computers and networks used by North Korean hackers was critical in gathering information that led Washington to conclude Pyongyang was behind last year's cyberattack on Sony Pictures.
The New York Times first reported that the NSA began placing malware in North Korean systems in 2010. Originally, the purpose of the surveillance was to gain insight into North Korea's nuclear program, but the focus shifted after a large cyberattack on South Korean banks and media companies in 2013.
Fox News has confirmed that investigators have since concluded that the hackers spent more than two months last fall mapping Sony's computer systems and planning how to attack it.
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