Malware
CROSSWALK
aka ProxIP · Motnug · TOMMYGUN
According to FireEye, CROSSWALK is a skeletal, modular backdoor capable of system survey and adding modules in response to C&C replies.
CROSSWALK, also known as ProxIP, Motnug, TOMMYGUN, is a Windows malware family operated by APT41.
Background
FireEye describes CROSSWALK as a bare-bones, modular backdoor that can perform system reconnaissance and load additional modules based on responses from its C&C.
Source: Malpedia (Fraunhofer FKIE).