OS X Transmission users who downloaded version 2.90 version of OS X have been infected with KeRanger. The malware is still under active development and it seems the malware is also attempting to encrypt Time Machine backup files to prevent victims from recovering their back-up data. Apple revoked the digital certificate and updated its XProtect antivirus. Users of older versions of Transmission do not appear to be affected as of now. The ransomware-tainted Transmission installers had an extra RTF file which appeared with a normal-looking RTF icon.”]