Cyber security firm Symantec Corp. said it was "highly likely" a hacking group affiliated with North Korea was behind the WannaCry cyber attack this month that infected more than 300,000 computers worldwide and disrupted operations at hospitals, banks and schools across the globe. Symantec researchers said they had found multiple instances of code that had been used both in the North Korean group's previous activity and in early versions of WannaCry.
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