RAT
BreachRAT
This is a backdoor which FireEye call the Breach Remote Administration Tool (BreachRAT), written in C++.
BreachRAT is a Windows rat operated by Operation C-Major.
Background
This is a C++ backdoor that FireEye named the Breach Remote Administration Tool (BreachRAT). Its name comes from the hardcoded PDB path embedded in the RAT: C:\Work\Breach Remote Administration Tool\Release\Client.pdb
Source: Malpedia (Fraunhofer FKIE).