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FILE - In this May 13, 2017 file photo, a screenshot of the warning screen from a purported ransomware attack, as captured by a computer user in Taiwan, is seen on laptop in Beijing.  Global cyber chaos is spreading Monday, May 14,  as companies boot up computers at work following the weekend's worldwide "ransomware" cyberattack. The extortion scheme has created chaos in 150 countries and could wreak even greater havoc as more malicious variations appear. The initial attack, known as "WannaCry," paralyzed computers running Britain's hospital network, Germany's national railway and scores of other companies and government agencies around the world.  (AP Photo/Mark Schiefelbein, File)
FILE - In this May 13, 2017 file photo, a screenshot of the warning screen from a purported ransomware attack, as captured by a computer user in Taiwan, is seen on laptop in Beijing.  Global cyber chaos is spreading Monday, May 14,  as companies boot up computers at work following the weekend's worldwide "ransomware" cyberattack. The extortion scheme has created chaos in 150 countries and could wreak even greater havoc as more malicious variations appear. The initial attack, known as "WannaCry," paralyzed computers running Britain's hospital network, Germany's national railway and scores of other companies and government agencies around the world.  (AP Photo/Mark Schiefelbein, File)

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Possible North Korea link in cyber attack

CNN's Samuel Burk discusses the cyberattack that crippled computer systems around the world, and the possibility that North Korea could be behind it.

Possible North Korea link in cyber attack

CNN's Samuel Burk discusses the cyberattack that crippled computer systems around the world, and the possibility that North Korea could be behind it.