[WannaCry](https://attack.mitre.org/software/S0366) is ransomware that was first seen in a global attack during May 2017, which affected more than 150 countries. It contains worm-like features to spread itself across a computer network using the SMBv1 exploit EternalBlue.(Citation: LogRhythm WannaCry)(Citation: US-CERT WannaCry 2017)(Citation: Washington Post WannaCry 2017)(Citation: FireEye WannaCry 2017)