IDG Contributor Network: Open source app Transmission compromised to deliver Mac OS X ransomware

Ransomware named KeRanger was discovered by security firm Palo Alto Networks on Friday, March 4th. Crackers somehow managed to upload two modified installers of Transmission for OS X onto Transmission's servers.
Palo Alto Networks immediately notified both Apple and Transmission about the compromise. Transmission removed the infected installers, updated the software and pushed a notification that users will see upon running Transmission:
Read Immediately!!!!
Everyone running 2.90 on OS X should