Leaked NSA tools used in worldwide cyberattack

Analysts say sophisticated attack targeted companies around the world.
1:45 | 05/12/17

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Transcript for Leaked NSA tools used in worldwide cyberattack
Major global headline on folding as were on the air tonight a massive cyber attack underway at this hour 74 countries and right here in the US. Even hospitals among their targets computers frozen surgeries halted. US companies are taking action right now here's ABC's chief investigative course but Brian Ross. As the threat unfolds tonight. The first US company to admit being targeted is that tens of thousands of attacks around the world were announced with this ominous online message Lopes your important files are encrypted. With a follow up messes from the hackers pay a ransom or lose your files altogether. The reason this is hitting so many computers at once is they discovered a vulnerability in the most popular operating system in the world in Microsoft windows and they're taking advantage of. It appears to be the single biggest simultaneous ran similar attack in the history of the Internet it's an international attack and a number of countries and organize nations. That's being affected the attack hit hard in Britain. Locking up the computers of hospitals in the country's national health service some canceling surgery. An announcement came back at him. Over these would be down until at least Monday until about the lack a tax. Records doctors fear lives could be at risk. Brian Ross with a slot tonight he's following this as were honest sources telling you that officials here in the US are scrambling to contain this. That's right David officials at the highest levels met late today to see what they can do to stop it. And the irony is the attacks are based in part on tools developed by US intelligence to penetrate enemies. But those programs got leaked and now David they're being turned against him but freezing those hospitals and those surgeries particularly startling Eric Brian thank you.

This transcript has been automatically generated and may not be 100% accurate.

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