If at the moment of infection you had a valid commercial Dr.Web license and installed Dr.Web Security Space or Dr.Web Anti-virus for Windows (version 9+), or Dr.Web Enterprise Security Suite (version 6+), you are entitled to free decryption, if it is possible. You are welcome to file a request at https://support.drweb-av.it/new/free_unlocker/?keyno=&for_decode=1.