LogGAN: A Sequence-Based Generative Adversarial Network for Anomaly Detection Based on System Logs

System logs which trace system states and record valuable events comprise a significant component of any computer system in our daily life. There exist abundant information (i.e., normal and abnormal instances) involved in logs which assist administrators in diagnosing and maintaining the operation of the system. If diverse and complex anomalies (i.e., bugs and failures) cannot be detected and eliminated efficiently, the running workflows and transactions, even the system, would break down. Therefore, anomaly detection has become increasingly significant and attracted a lot of research attention. However, current approaches concentrate on the anomaly detection in a high-level granularity of logs (i.e., session) instead of detecting log-level anomalies which weakens the efficiency of responding anomalies and the diagnosis of system failures. To overcome the limitation, we propose a sequence-based generative adversarial network for anomaly detection based on system logs named LogGAN which detects log-level anomalies based on the patterns (i.e., the combination of latest logs). In addition, the generative adversarial network-based model relieves the effect of imbalance between normal and abnormal instances to improve the performance of capturing anomalies. To evaluate LogGAN, we conduct extensive experiments on two real-world datasets, and the experimental results show the effectiveness of our proposed approach to log-level anomaly detection.