DHS conducted a national exercise to see how the government and the private sector would react to a multi-sector cyberattack on critical infrastructure. The DHS exercise is known as CyberStorm, and it was during CyberStorm V that the participants were introduced to a type of malware that had some interesting characteristics of WannaCry. The malware included a feature that bricked infected systems when players blocked against the malicious IPs. Resolution required a coordinated 200 government and private sector response. Yet, the tabletop program ran by DHS uncovered a number of issues.”]
Source: https://www.csoonline.com/article/3197352/dhs-wargames-included-a-scenario-similar-to-wannacry.html