Malware
SlowStepper
According to ESET, SlowStepper is a feature-rich backdoor with a toolkit of more than 30 components, programmed in C++, Python, and Go.
SlowStepper is a Windows malware family.
Background
ESET describes SlowStepper as a capable backdoor whose toolkit spans more than 30 components, built using C++, Python, and Go.
Source: Malpedia (Fraunhofer FKIE).