Sensitive organizations such as the Intelligence Community (IC) have faced increasing challenges of insider threats because insiders are not always friends, but can be significant threats to the corporate assets. Statistically, it is accepted that the cost of insider threats exceeds that of outsider threats. Many security technologies have been invented to prevent threats from outsiders, but they have limited use in countering insiders' abnormal behaviors. Furthermore, individual-based monitoring mechanisms are not scalable for a large enterprise system. Therefore, in this paper, we introduce a scalable and accurate approach with the role-based profile analysis for countering insider threats, focusing on the relationship between insiders and their systems to detect anomalies. Also, we describe our simulation with synthetic data sets of baseline and threat scenarios.