Yes, sir there are. I've thought a lot about it. In World of Warcraft, you're allowed to make custom UI mods. A lot of the game takes place in what they call "raid content" aka 40 man dungeons. 40 players going into a dungeon, basically. Well, damn near all of these guilds that run these dungeons require you to run a few mods that I've been interested in exploiting but I'm just a beginner. One that comes to mind is CT_Raid. It's a mod for tracking the life, mana, status effects, etc.. of all the raid members, it basically joins a chat channel and sends messages telling the rest of the channel how you're doing. I've modded mine to report version # 420.2600 and I've been very interested in the possibility of a CT_Raid worm.
If you're the raid leader or marked as an assistant, you can execute /rajoin (it's a CT_Raid command) and force everyone in the raid with CTRaid to join your CTRaid channel and sync with you. There's also a "battleground" called alterac valley that's 40 man where you get automatically put into a raid with the rest of the people on your team. I could see a worm propegating there through a vulnerability in the mod (so not owning everyone but 60-75% would be a pretty accurate number).
Like I said, I'm just a beginner but I would love for a "security expert" to take a look at the mod and either help me learn or just tell me what he thinks. They're all written in XML and LUA by the way, I realize that's very important, so there it is. But I've already seen a lot of threads on [
ui.worldofwar.net] (A WoW UI development website) about executing third party programs from a UI mod but whether you're able to overflow a buffer or something, I do not know. I'm a lot more interested in SQL injection, XSS, remote file inclusion, web application security, etc.. at the moment but I wouldn't mind switching gears.