https://finance.yahoo.com/news/olympic-destroyer-malware-targeted-pyeongchang-182637035.html

Researchers with cyber security firms Cisco Systems Inc, CrowdStrike and FireEye Inc said in blog posts and statements to Reuters on Monday that they had analyzed computer code they believed was used in Friday's attack.

All three security companies said the Olympic Destroyer malware was designed to knock computers offline by deleting critical system files, which would render the machines useless.