The document discusses threat hunting for lateral movement. It begins with an overview of lateral movement, describing it as techniques attackers use to access and control systems within a network. It then covers the lateral movement process, including initial compromise, reconnaissance, credential theft, and lateral movement events. The document demonstrates Sqrrl's lateral movement detectors, which use data science techniques like graph analysis and machine learning to detect lateral movement in network data. It discusses building a lateral movement detector by aligning it with TTPs, using classifiers to rank events, and implementing it at scale in Spark.