For developers: Study this attack vector. Patch your CMSG_SPELL_CLICK handlers. Validate everything. For players: Don't bother. The nostalgia of Wrath is worth playing fairly.
"wow hack damage 3.3.5a 41" refers to a specific type of exploit or "hack" used in the World of Warcraft (WoW) version 3.3.5a, which corresponds to the Wrath of the Lich King