I know Pathfinder has hook swords, so the stats should be freely available online. Unfortunately, the only source I know of is Ultimate Equipment, and I think they're called something different there so I can't pinpoint them.
EDIT: Found them! The PF name for them is shang gou, and the original source appears to have been Ultimate Combat. They are martial light weapons, 1d4 slashing, and they have Disarm when used individually or gain Trip when wielding two of them together 1-handed. See here