korea bya gang-- which security researchers have nick named the dark-- gang which was the name e malused at thee. these hackers were on the surface looked like hacktivists. they were defacing web sites. but the code they had writtenyy designed for south korean and military secrets and also fruchlt is bases, which theree manyo whileo conclusive evidence that north korea is indeed behindsk e also denied it. just todayd that it was a rightous deed that perhaps some pro north thet is that if they wanted to do that attack, they would have the capability to do so. >> tell us about the structure of what amounts to the northn cyberunit.lnha&ike is has its own military intelligence which is specifically designedo its enemy. now within north korea there ant called the generale bureau.dn t, essentially.u have spoken to noh korean did-- they told you hackers areentivsof this. >> the defectors that we to inls hacking as af the north korean eliteaer,.s a highr pfficial dr -- profession tlferxe meaning peep that do computer science in p, you don'to be the elite. we spoke to some defectors who saidyd fr