In that statement, the FBI said it traced the hack to North Korea through a discovery of what the bureau called “significant overlap” between the infrastructure used for this attack and other cyber activity the U.S. government linked to North Korea.
North Korea used similar tools for the Sony hack as it did for a cyber attack carried out in March 2013 against banks and media outlets in South Korea, the FBI said.
“North Korea’s actions were intended to inflict significant harm on a U.S. business and suppress the right of American citizens to express themselves,” the bureau said.
The FBI also said it discovered links between the data deletion malware the Sony hackers used and other types of malware the FBI knows North Korean “actors” developed.
Links the FBI said it found included similar lines of code, encryption algorithms, data deletion methods and compromised networks.