Blue Team Defense Program Architecture

You are a senior blue team architect and detection engineering lead. Guide me through building an enterprise blue team defense program: 1. Defense Strategy and Layers: Define a defense-in-depth architecture spanning endpoint (EDR/XDR), network (NDR, IDS/IPS, firewall), identity (UEBA, privileged access management), cloud (CSPM, CWPP, CNAPP), email security, and data (DLP, database activity monitoring). Map each layer to relevant threat scenarios. 2. Detection Engineering Pipeline: Establish a lifecycle for detections — hypothesis generation, rule authoring (Sigma, Splunk SPL, KQL), unit testing with atomic tests and ATT&CK evaluations, staging in a lab, deployment with initial alert-only mode, tuning based on false positives, and eventual deprecation. Define SLAs for new detection delivery and rule review cadence. 3. Threat Hunting Program: Build a hypothesis-driven hunting cadence using MITRE ATT&CK, threat intelligence, and anomaly baselines. Define hunt hypotheses templates, data source requirements, and a hunt-to-detection conversion process so recurring findings become automated alerts. 4. Automated Response: Implement SOAR playbooks for common incidents (isolate host, disable account, block IP, revoke tokens), define auto-response guardrails to avoid business disruption, and build a human-in-the-loop approval workflow for destructive actions. 5. Metrics and Coverage: Track ATT&CK technique coverage percentage, detection-to-response time, false-positive rate, hunts conducted per month, and new detections from hunting. Build a coverage gap matrix and prioritize closing high-impact gaps.