Comment U.S. stands by its assertion (Score 3, Informative) 236
Here's an update: North Korea denies hacking Sony, U.S. stands by its assertion
The FBI said technical analysis of malicious software used in the Sony attack found links to malware that "North Korean actors" had developed and found a "significant overlap" with "other malicious cyber activity" previously tied to Pyongyang. But it otherwise gave scant details on how it concluded that North Korea was behind the attack.