Website of Popular Mac Software Hacked to Spread Malware

According to the article, If you have recently downloaded the popular open source video transcoder app HandBrake on your Mac, there are chances that your computer is infected with a notorious Remote Access Trojan (RAT).
Here's the notice from HandBrake - https://forum.handbrake.fr/viewtopic.php?f=33&t=36364
and here is the background info on PROTON -
https://www.cybersixgill.com/wp-content/uploads/2017/02/02072017%20-%20Proton%20-%20A%20New%20MAC%20OS%20RAT%20-%20Sixgill%20Threat%20Report.pdf