This book provides a comprehensive guide to understanding and countering Advanced Persistent Threats (APTs) targeting Israel's critical infrastructure. It delves into the tactics, techniques, and procedures of threat actors, highlighting key cyber adversaries from regional and global contexts. Focusing on actionable intelligence, the book equips Israeli cyber threat intelligence professionals with tools for proactive defense and collaboration. Through case studies and real-world insights, readers will learn to detect, respond, and mitigate sophisticated cyber attacks effectively. This resource is essential for anyone involved in safeguarding Israel's national security in the evolving cyber landscape.