One of sub-missions avaliable sometimes. Requires to find merchendise and talk to him.
cm_new_eden - Immediately after exiting the area your armoury (and in campaign, Mentor) is located in, turn to your left. Head down that street; you should pass under an overpass. To your left will be a ramp leading up; after heading up turn back and you'll see entrance to the Mc Hack
cm_wurstercorp - get to the street and turn left; head to the water; near the left building's side there's a stairs leading toward him