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What some consider to be highly sensitive, classified information with the russians. stay with us for that. also new this morning, huge cyber attack that affected hundreds of thousands across the globe. digital clues now point to north korea. for more, we're joined by cnn tech correspondent samuel burke. north korea, samuel. >> john, this is a very surprising development, because in the past few days, researchers looking at this code were thinking it's got to be a small group of people, not a country or a government, because usually those are targeted attack hacks. think of stuxnet and the i...

Lazarus group. that's the group that they say was behind the sony attack, and of course, the united states government says north korea was behind that. you don't have to know code here to understand that these are very similar looking. so, they say that this is just a possible link. the first few days of the investigation, they're not sure. some have questioned could it be a false flag, that another hacking group that's put in there, and experts like kasperski say they just don't think so, but they want more time to try and look at it. but three of the most important cyber researchers in the w...

Won't get your data. >> of course there are amounts that have been demanded in this case relatively small amounts. $300, rising to $600 if you don't pay within three days. remarkably few payments so far that we have noticed as we're tracking it. so most people are not paying this. >> cyber security researchers in the uk and the u.s. discovered a kill switch that stopped the spread of the virus, but the investigators fear there could be another wave of attacks on monday when businesses and people work willing turn on that switch and go to work. for now, more on that. we are joined by john henry...