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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 gr...

Inside access. >> u.s. investigators have evidence that hackers stole the computer credentials of a sony system administrator to get inside access. but could another government helped north korea? u.s. says there are signs others other involved. >> signs suggest iran is involved. they have worked together on missile development for many years. because iran has been a major client of north korea weapons. >> cnn reached out to iranian officials about that. they didn't respond. the white house maintains north korea acted alone. >> we've got no indication north korea was acting in con juchx with a...

Inside access. >> reporter: u.s. investigators have evidence that hackers stole the computer credentials of a sony system administrator to get inside access but could another government have helped north korea? one analyst says another u.s. enemy may be involved. >> there are signs that suggest iran may indeed have helped. because they have worked together on missile development for many years because iran has been a major client of north korea weapons. >> reporter: cnn reached out to iranian officials about that. they didn't respond. the white house maintains north korea acted alone. >> we've...

As sony. they acted perfectly rationally. if you are them. the rest of us have to live with the consequences. i think we don't have a good notion of how to both defend ourselves against cyberattacks and, not just the u.s. government. it is obviously private industry. as well as how to respond. so when people talk about warfare, what does that mean? how are we actually supposed to respond? and it's -- it is a new era in this regard. >> kevin, to you now. u.s. investigators learned the hackers stole the computer credentials of an administrator to get access to sony's computer system. how hard on...

>> the obama administration is ready to point the finger at north korea for the unprecedented sony hack. a move that could come as early as this morning. >> we're considering a range of options about how to respond. >> among the possible options, more sanctions. the administration insisting the response will be strong. >>ky assure you the united states government is not blinking, we're not backing down, we're not in a crouching or fear position here. >> sources tell cnn there's evidence that the hackers stole computer credentials from a sony system administrator to get access to the company's ...