Malware
DarkWatchman
Prevailion found this RAT written in JavaScript, which dynamically compiles an accompanying keylogger written in C# and uses a DGA for C&C.
DarkWatchman is a JavaScript malware family.
Background
Prevailion identified this JavaScript-based RAT, which compiles a companion C# keylogger on the fly at runtime and relies on a DGA for its C&C communications.
Source: Malpedia (Fraunhofer FKIE).