Open Access

Identifying MMORPG Bots: A Traffic Analysis Approach

  • Kuan-Ta Chen1Email author,
  • Jhih-Wei Jiang2,
  • Polly Huang3,
  • Hao-Hua Chu2,
  • Chin-Laung Lei3 and
  • Wen-Chin Chen2
EURASIP Journal on Advances in Signal Processing20082009:797159

Received: 10 April 2008

Accepted: 8 September 2008

Published: 8 October 2008


Massively multiplayer online role playing games (MMORPGs) have become extremely popular among network gamers. Despite their success, one of MMORPG's greatest challenges is the increasing use of game bots, that is, autoplaying game clients. The use of game bots is considered unsportsmanlike and is therefore forbidden. To keep games in order, game police, played by actual human players, often patrol game zones and question suspicious players. This practice, however, is labor-intensive and ineffective. To address this problem, we analyze the traffic generated by human players versus game bots and propose general solutions to identify game bots. Taking Ragnarok Online as our subject, we study the traffic generated by human players and game bots. We find that their traffic is distinguishable by 1) the regularity in the release time of client commands, 2) the trend and magnitude of traffic burstiness in multiple time scales, and 3) the sensitivity to different network conditions. Based on these findings, we propose four strategies and two ensemble schemes to identify bots. Finally, we discuss the robustness of the proposed methods against countermeasures of bot developers, and consider a number of possible ways to manage the increasingly serious bot problem.

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Authors’ Affiliations

Institute of Information Science, Academia Sinica
Department of Computer Science and Information Engineering, National Taiwan University
Department of Electrical Engineering, National Taiwan University


© Kuan-Ta Chen et al. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.