WannaCry - Ransomware
The ransomware uses exploits leaked by the Shadow Brokers and has infected a large number of computers including those in the government, telecom, and educational sectors. Files are encrypted denoted by the .WNCRYT extension. The bounty for WannaCry ranges from $300 to $600 but payments may not be uniquely associated with a system. The initial variants of WannaCry no longer encrypts if the sample can resolve an external DNS which is held by security researchers.