Sony Pictures hackers 'got sloppy': FBI

FBI Director James Comey says investigators have fresh evidence pointing to North Korea being behind the Sony cyber attack.

US federal investigators claim the hacker group, "Guardians of Peace", which claimed responsibility for the hack, posted material via servers used exclusively in North Korea.

Comey has made the revelation at a Cyber Security conference in New York.

"The 'Guardians of Peace' would send e-mails threatening Sony employees and would post online various statements explaining their work. In nearly every case they used proxy servers to disguise where they were coming from, in sending those e-mails and in sending and pasting and posting those statements. But several times they got sloppy, several times either because they forgot or they had a technical problem, they connected directly and we could see them. And we could see that the IP (Internet Protocol) addresses that were being used to post and to send the e-mails were coming from IPs that were exclusively used by the North Koreans. It was a mistake by them that we haven't told you about before that was a very clear indication of who's doing this. They would shut it off very quickly once they realized the mistake but not before we saw them and knew where it was coming from." The North Korean government applauded the hack of Sony's system at the time.

However, it has consistently denied any involvement.

Sony's network was hit by hackers as company prepared to release "The Interview", a comedy about plans to assassinate North Korean leader Kim Jong-Un.

The Obama administration has since levelled new sanctions on North Korea in the wake of the cyber attack.

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