Gpcode.ak encrypts encrypted files and deletes them. Its not possible to decrypt files encrypted by the virus without the private key. However, there is a way in which encrypted files can be restored to their original condition. The PhotoRec utility was created by Christophe Grenier and which is distributed under General Public License (GPL) The utility was originally created in order to restore graphics files. It can currently be used to restore Microsoft Office documents, executable files, PDF and TXT documents.”]
Source: https://securelist.com/restoring-files-attacked-by-gpcode-ak/30428/