It responds to Source query protocol at UDP port 27015.
This doesn't changes it: -QueryPort=. In fact it doesn't changes anything in socket bindings.
None of these ports (except 27015) reveals something interesting in HLSW, so Source is the way to go.
C:\WINDOWS\system32>netstat -nao | findstr 22884
TCP 0.0.0.0:7779 0.0.0.0:0 LISTENING 22884
UDP 0.0.0.0:7778 *:* 22884
UDP 0.0.0.0:7779 *:* 22884
UDP 0.0.0.0:13000 *:* 22884
UDP 0.0.0.0:27015 *:* 22884
UDP 0.0.0.0:41765 *:* 22884