SPLM, otherwise known as CHOPSTICK, or by the author(s) as “XAgent”, is described as Sofacy’s signature second stage tool, selectively used for years against around the world. Really, many modified XAgent modules have been deployed over the years. Even the individual Linux modules renamed as “Fysbis” backdoors released in 2016 were merely modified and reduced portions of recompiled XAgent C/C++ codebase. Anyway, SPLM/CHOPSTICK has maintained various combinations of code, with some recognizable functionality listed here.