Explore essential Operational Technology (OT) concepts for Blue Team professionals in this 40-minute conference talk from Ekoparty 2021: BlueSpace. Delve into Industrial Control System (ICS) technologies, architecture, and potential attacks. Learn about Intrusion Detection Systems (IDS) specifically designed for OT environments, including detection use cases and key characteristics. Gain insights into Cyber Threat Intelligence and its application in the industrial sector. Understand the MITRE ATT&CK framework and its relevance to OT security. Discover effective Cyber Threat Hunting techniques for protecting critical infrastructure. Benefit from the expertise of Santiago Abastante, an Incident Responder and Threat Intelligence Specialist, and Matias Manassero, an Industrial Cyber Security Consultant, as they share their knowledge on securing operational technology environments.