Kim Jong Un

FBI director confident North Korea was behind Sony 'hack'

The FBI director revealed new details Wednesday about the stunning cyberattack against Sony Pictures Entertainment Inc., part of the Obama administration's effort to challenge persistent skepticism about whether North Korea's government was responsible for the brazen hacking.

Speaking at the International Conference on Cyber Security at Fordham University, FBI Director James Comey revealed that the hackers "got sloppy" and mistakenly sent messages directly that could be traced to IP addresses used exclusively by North Korea. Comey said the hackers had sought to use proxy computer servers, a common ploy hackers use to disguise their identities and throw...