"Hit by ransomware and have no backup? Most of the time, regretfully, you have no chances to recover the encrypted data beyond paying the ransom to the extortionists. The crypto algorithms employed in these attacks cannot be cracked, and the private decryption key is kept on servers inaccessible to the victims.
But let’s be positive. Quite a few ransomware happy ending cases, applicable decryption tools, and resources are covered in this post."
Tripwire Security Article - http://www.tripwire....cryption-cases/