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Threat may not be the only concerns about north korea. security experts tracking the global ransomware attack that affected 150 countries say the trail of clues could lead back to the north korean regime, which has a long record of computer criminality. cnn's alexandra field following the developments for us. she joins us live in seoul. good morning to you, alex. what do we know about this possible link? >> reporter: hey, dave. well, this is a massive attack, so it will take a while to get to the bottom of it, but there are leads, there is a direction to go in. here's how you get to the bottom...

So you won't even have to call us. change your wifi password to something you can actually remember, instantly. add that premium channel, and watch the show everyone's talking about, tonight. and the bill you need to pay? do it in seconds. because we should fit into your life, not the other way around. go to xfinity.com/myaccount missile tests and a nuclear threat may not be the only concerns about north korea. security experts tracking the global ransomware attack that affected 150 countries say the trail of clues could lead back to the north korean regime, which has a long record of comput...

Then demanding ransom to free the files. and tonight, investigators say new clues may be pointing to a familiar culprit. here's brian ross. >> reporter: cybersecurity researchers tracking the attack tonight, say the trail could lead to north korea. that the computer code that produced the attack with these ominous messages, the code used by north korea on attack on international banks last year. it could be someone else using the north korean code, says researchers. but the country has a long record of computer criminality. >> we have seen them steal money and information. we have seen them de...

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