Not just WoW, Ragnarök also
AVG Free 7.5 also flags Ragnarök (another MMORPG just like WoW) anti-cheat tools (nProtect Gameguard) as if infected with a trojan (something like Proxy.PKM), and claims it removed it. But every time the game is run again, the anti-cheat tools reinstall by itself. Norton Antivirus 2006 won't even let the game run.
So, on another newly formatted machine, I installed the game, installed AVG, and it becomes clear that the trojan IS PART of the game anti-cheat system, since it showed up again.
I also had a zipped (compressed...) copy of the game folder, long forgotten (and therefore safely contained) that AVG also picked up, proving that along with every copy of the game, there it was also the trojan.
It seems that the only way Koreans will ensure that nobody is hacking their game is to install a rootkit themselves in your machine, so if they think you are cheating, they can log in the rootkit and take a look at the memory registers used in the character stats/items/cash (usually what people will try to hack).
Or... er... you can't tell if they are truly running this rootkit tool or if they are unaware that their servers are stuffed.
Anyway, after I log in the game, I run AVG, remove the trojan, and play safely until the game is closed again. They should either confirm they run the rootkit, so I can tell AVG to ignore it, or tell AVG that their software is legitimate and it is a false positive. Meanwhile I will keep deactivating it, even if it is part of the game. It appears not, as it runs anyway.
Surely I will ask their tech support about it...