A new ransomware called Jaff Ransomware was found today by Malwarebytes’ malware researcher S!Ri. Jaff is being heavily distributed via MALSPAM from the Necurs botnet. The ransomware encrypts files using AES encryption and appends the.jaff extension to encrypted files. After analysis by Emsisoft’s Fabian Wosar it was determined that the Jaff. is not decryptable. There may be methods that can be used to recover some of the files, so please contact Emisoft or the helpers at BleepingComputer before paying a ransom.
Source: https://www.bleepingcomputer.com/news/security/jaff-ransomware-distributed-via-necurs-malspam-and-asking-for-a-3-700-ransom/