raise serious questions about the fbi's claim that the malaware used in the attack is similar to malaware used in other attacks by north korea. these firms say that malaware was leaked a long time ago and could have been used by hackers anywhere in the world. previously u.s. investigators said they have evidence hackers stole the computer credentials of a sony insider but norse believes it was given out and they track the attack to one potential suspect. a woman code named lena, a former sony employee who he says worked for sony for several years. guideline says lena has ties to the hacking group guardians of peace which claims responsibility for the sony hit. guideline says lena was a security staffer with sony who had what he calls super user access to the company's cybersecrets. user names and passwords to critical systems. he says lena had two motives for hack. >> first of all, how sony treated its employees layoffs that were going on in the department but also a bigger