From bleepingcomputer.com
If you have been infected with a HiddenTear Ransomware variant, then you are in luck as a program called HiddenTearDecrypter has been created by Michael Gillespie that allows you recover your encryption key without having to pay the ransom.
HiddenTear is the name of a ransomware family whose full source code was published on GitHub. This allowed attackers to download the source code and create their own ransomware variants that could be used to infect victims.
Due to the source code’s wide availability, there are many ransomware infections under different names that utilize the same HiddenTear code base. As the original code was decryptable, this means all other ransomware created from the same code are decryptable as well.