Researchers looking into a new APT group targeting gambling sites with a variety of cross-platform malware recently identified a version of oRAT malware targeting macOS users and written in Go. While neither RATs nor Go malware are uncommon on any platform, including the Mac, the development of such a tool by a previously unknown APT is an interesting turn, signifying the increasing need for threat actors to address the rising occurrence of Macs among their intended targets and victims. In this post, we dig deeper into the technical details of this novel RAT to understand better how it works and how security teams can detect it in their environments.