Avast Decryption Tool for Apocalypse can remove Apocalypse, a form of ransomware first spotted in June 2016.Apocalypse adds .encrypted, .F*ckYourData, .locked, .Encryptedfile, or .SecureCrypted to the end of filenames. (e.g., Thesis.doc = Thesis.doc.locked)Opening a file with the extension .How_To_Decrypt.txt, .README.Txt, .Contact_Here_To_Recover_Your_Files.txt, .How_to_Recover_Data.txt, or .Where_my_files.txt (e.g., Thesis.doc.How_To_Decrypt.txt) will display a variant of the message seen in the screenshot.