This kind of virus uses encryption method to decrypt of system data which can be accessed only by the decryption key.
I believe this keys are not available.
Encrypted file is only available through the cyber criminals, victims may be tempted to purchase it and pay the exorbitant fee.
You can try some Malware Removal Tool which may help you to remove those viruses.
I have heard about Malwarebytes Virus Removal Tool which tends to remove malwares and viruses from system.