[Cardinal RAT](https://attack.mitre.org/software/S0348) is a potentially low volume remote access trojan (RAT) observed since December 2015. [Cardinal RAT](https://attack.mitre.org/software/S0348) is notable for its unique utilization of uncompiled C# source code and the Microsoft Windows built-in csc.exe compiler.(Citation: PaloAlto CardinalRat Apr 2017)