World of Warcraft (WoW) patch 3.3.5, "damage hacks" typically refer to —manipulating existing game mechanics—rather than third-party software that alters the game code. Because the server controls damage calculations, true "hacks" that modify damage values locally are generally ineffective and easily detected.
A: No. Any working hack would have been patched within days in 2010, and modern anti-cheat is even stronger.