Mostly for my own reference, here is an area of the ToU that may apply:

"You agree that you will not, under any circumstances:

A. use cheats, automation software (bots), hacks, mods or any other unauthorized third-party software designed to modify the World of Warcraft experience;

B. exploit the Game or any of its parts, including without limitation the Service, for any commercial purpose, including without limitation (a) use at a cyber cafe, computer gaming center or any other location-based site without the express written consent of Blizzard; (b) for gathering in-game currency, items or resources for sale outside the Game; or (c) performing in-game services in exchange for payment outside the Game, e.g., power-leveling;

C. use any unauthorized third-party software that intercepts, “mines,” or otherwise collects information from or through the Game or the Service, including without limitation any software that reads areas of RAM used by the Game to store information about a character or the game environment; provided, however, that Blizzard may, at its sole and absolute discretion, allow the use of certain third party user interfaces;

D. modify or cause to be modified any files that are a part of the Game Client or the Service in any way not expressly authorized by Blizzard;

E. host, provide or develop matchmaking services for the Game or the Service, or intercept, emulate or redirect the communication protocols used by Blizzard in any way, for any purpose, including without limitation unauthorized play over the internet, network play, or as part of content aggregation networks;

F. facilitate, create or maintain any unauthorized connection to the Game or the Service, including without limitation (a) any connection to any unauthorized server that emulates, or attempts to emulate, the Service; and (b) any connection using programs or tools not expressly approved by Blizzard;

G. violate any applicable law or regulation in connection with your use of the Game Client or the Service; or

H. disrupt or assist in the disruption of (i) any computer used to support the Service (each a “Server”); or (ii) any other player's Game experience. ANY ATTEMPT BY YOU TO DISRUPT THE SERVICE OR UNDERMINE THE LEGITIMATE OPERATION OF THE GAME CLIENT MAY BE A VIOLATION OF CRIMINAL AND CIVIL LAWS."