Badly-Coded Ransomware Locks User Files and Throws Away Encryption Key (softpedia.com)
An anonymous reader writes: A new ransomware family was not tested by its developer and is encrypting user files and then throwing away the encryption key because of an error in its programming. The ransomware author wanted to cut down costs by using a static encryption key for all users, but the ransomware kept generating random keys which it did not store anywhere. The only way to recover files is if users had a previous backup. You can detect it by the ransom message which has the same ID:qDgx5Bs8H
So it's like the old fashion viruses that actually cause damage to your system then.
If the author decided on an open source project, the community could have found and developed a fix during beta testing.