Prepare to Implement NERC CIP-015 Internal Network Security Monitoring (INSM) Requirements

**Executive summary:** Dragos outlines the adoption of NERC CIP-015-1 requiring Internal Network Security Monitoring (INSM) for high- and certain medium-impact BES Cyber Systems, provides key deadlines and regulatory incentives for early adoption, and recommends planning and deploying network monitoring capabilities—citing historical threat activity from groups like ELECTRUM (CRASHOVERRIDE) and CHERNOVITE (PIPEDREAM) to illustrate the operational need for enhanced anomaly detection, IOCs, and behavioral/composite detections.