From http://tsyrklevich.net/tbb_payload.txt - yes. It uses Winsock routines and WinAPI stdcall calling conventions.
http://www.mozilla.org/security/announce/2013/mfsa2013-53.ht...
Is the exploit that the request is made outside of the TOR proxy (thus revealing the true origin IP) or that it gathers information about the host and sends that via TOR to some machine?
Since it is a Windows executable, this is done outside of TOR.