CNN The Situation Room April 17, 2015 21:42:00
>> reporter: jim jong-unkim jong-un has a larger cyber branch. commanded by general kim jeong which o,kho, a former aide of his father's. >> a couple of trial runs with attacks on south korea's media and banks two years ago. >> reporter: tonight, cyber security experts are warning the threat is far from over. north korea, iran any u.s. adversary can strike eastern the most powerful even the most powerful companies. >> every day corporations are targeted by advanced adversaries using e-mails just like this. >> reporter: they would not comment citing an ongoing investigation into the hack. ive r...