Fabian Wosar of Emisoft has released a decrypter for the HydraCrypt and UmbreCrypt ransomware infections. Both of these infections are part of the CrypBoss Ransomware family, whose source code was leaked on pastebin last year. Fabian was able to utilize the original flaw to crack these variants as well. If you are infected with this malware, simply download decrypt_hydracrypt.exe from the following link and save it on your desktop. Once you determine the key used to encrypt one of your files, you can then use that key to decrypt ALL other files on your computer.
Source: https://www.bleepingcomputer.com/news/security/emsisoft-releases-a-decrypter-for-hydracrypt-and-umbrecrypt-ransomware/