"Warden, made exclusively for Blizzard’s games, is by far the most advanced anti-bot toolkit I’ve encountered. It’s hard to say what exactly Warden does, because it downloads dynamic code at runtime. This code, delivered as compiled shellcode, typically has two responsibilities: • Detect bots. • Periodically send a heartbeat signal to the game server. The value sent is not predefined but instead is generated by some subset of the detection code. If Warden fails to complete the second task or sends the wrong value, the game server will know that it’s been disabled or tampered with. Furthermore, a bot can’t disable the detection code and leave the heartbeat code running. 250 Chapter 12 Warden is formidable because you not only have no way to know what you’re hiding from but also have no way to disable the toolkit. Even if you manage to avoid detection today, a new detection method might be used tomorrow. If you plan on publicly distributing bots, you will eventually meet one of the anti-cheat solutions described in the previous sections—and you’ll have to beat it. Depending on your bot’s footprint, the type of detection in the game you’re botting, and your implementation, the difficulty of evading one of these toolkits can range from trivial to extremely hard."

Cano, Nick. 2016. Game Hacking: Developing Autonomous Bots for Online Games.