The master decryption key for crysis ransomware was released earlier this month and Eset security researchers have created a decryption tool.

The master key was released to Pastebin and was first reported by BleepingComputer. Both Eset and Kaspersky have used that information to create the decryption tool.

The ransomware was first sighted in May of 2016 and the security firm has since found 123 variants. Most of the victims were in Spain, Brazil and France. It's still uncertain as to how the malware was spread, but researchers posit that it was distributed by spam and infected ads found on social networks.

Lawrence Abrams, BleepingComputers founder, believes the master key was released by the creator primarily because the malware contains the C header files.

Source: SCMagazine