Here's how U.S. investigators believe the culprits got into Sony's systems http://cnn.it/1x3RW4D

 

Washington (CNN) -- U.S. investigators have evidence that hackers stole the computer credentials of a system administrator to get access to Sony's computer system, allowing them broad access, U.S. officials briefed on the investigation tell CNN. The finding is one reason why U.S. investigators do not believe the attack on Sony was aided by someone on the inside, the officials tell CNN