This quest is not available in game.
Speak with Therzok in the Cleft of Shadow in Orgrimmar.
Lower your voice, <name>. Yeah, I know your name. Was told to keep an eye out for an orc by your description.
From what we've heard about you, you can handle yourself in combat, and aren't opposed to a little sneakery from time to time.
Am I right?
Anyways, you should go see Therzok in Orgrimmar. He's got an offer for you to hear.