The WannaCry ransomware attack was a worldwide cyberattack in May 2017 by the WannaCry ransomware cryptoworm, which targeted computers running the Microsoft Windows operating system by encrypting data and demanding ransom payments in the Bitcoin cryptocurrency.[4] It propagated by using EternalBlue, an exploit developed by the United States National Security Agency (NSA) for Windows systems. Etern
![WannaCry ransomware attack - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/e0b4013782ab8a75611baa38a07795b439a7a87a/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fen%2F1%2F18%2FWana_Decrypt0r_screenshot.png)