GandCrab, one of the most prolific and aggressive ransomwares of 2018, has a new free decryptor for versions 1, 4 and 5 on the No More Ransom website.
http://feedproxy.google.com/~r/Securityweek/~3/9hWV0D8ARmA/gandcrab-14-and-5-decryptor-available