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Organizations are experiencing an ever-growing concern of how to identify and defend against insider threats. Existing methods have distinguished the minority of users who show suspicious behavior from the majority of users. However, these methods failed to apply the features reflecting the deviation between the behaviors of users and those of their user groups within the similar job roles. This paper focuses on insider threat detection by conducting both user and role behaviors analysis. It extracts multiple features that represent the details of activities conducted by each user and their deviations from the behaviors of their user groups. The malicious users are then detected by using an unsupervised algorithm, Isolation Forest Algorithm, which evaluates the variance that each user exhibits across multiple attributes, compared against the other users. To evaluate the performance of the proposed models …