Remote access trojans (RATs) are legacy threats that continue to evolve alongside an expanding and ever-changing threat landscape. Following our recently published articles about novel and notable RATs, including KarstoRAT, the latest version of ClickFix, and ClickFix’s macOS variant, we analyzed QuimaRAT, a novel Java-based RAT that targets Windows, Linux, and macOS environments and is currently being sold on the dark web as a subscription-based RAT platform.