Users of the popular open-source Transmission BitTorrent client for OS X were in for quite a surprise this weekend when it was discovered that certain installers for version 2.90 of the application were found to bundle unwanted ransomware with the installation, which is a type of malware that restricts file access across the system to cause trouble for the user.
Dubbed KeRanger by security research firm Palo Alto Networks, the malicious software will try to encrypt the user's system files in such a way as to tamper with the user's access to their Mac and then force the user to pay money to get their access back.
The makers of the Transmission app are now pushing immediate mandatory app updates to remove the ransomware and fix the problem for those that may have been affected, and it's recommended for all users, but how do you know if you're affected?