(Bloomberg) --Cybersecurity researchers at Symantec Corp. and FireEye Inc. have uncovered more evidence tying this month’s WannaCry global ransomware attacks to North Korea.

The cyberattack that infected hundreds of thousands of computers worldwide was “highly likely” to have originated with Lazarus, a hacking group linked to the reclusive state, Symantec said. The software used was virtually identical to versions employed in attacks earlier this year attributed to the same agency, the company said in a report late Monday.

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