They are still just guessing who did it…..
Check it out:

FBI agents investigating the Sony Pictures hack were briefed Monday by a security firm that says its research points to laid-off Sony staff, not North Korea, as the perpetrator — another example of the continuing whodunit blame game around the devastating attack.

Even the unprecedented decision to release details of an ongoing FBI investigation and President Barack Obama publicly blaming the hermit authoritarian regime hasn’t quieted a chorus of well-qualified skeptics who say the evidence just doesn’t add up.