The HandBrake app’s website has been compromised, and one of its download mirrors has been modified to host a version of the Proton RAT embedded in the app’s Mac client. The RAT can be used to steal data from infected devices, but also to allow attackers to connect via VNC or SSH to infected hosts. The main author of the app is also the author of Transmission BitTorrent client for Mac. Users who downloaded the app for Mac 1.0.7 are most likely compromised.
Source: https://www.bleepingcomputer.com/news/security/website-of-handbrake-app-hacked-to-spread-proton-rat-for-mac-users/