NIST 800-53 REV 5 • SYSTEM AND INFORMATION INTEGRITY
SI-4(2) — Automated Tools and Mechanisms for Real-time Analysis
Employ automated tools and mechanisms to support near real-time analysis of events.
Supplemental Guidance
Automated tools and mechanisms include host-based, network-based, transport-based, or storage-based event monitoring tools and mechanisms or security information and event management (SIEM) technologies that provide real-time analysis of alerts and notifications generated by organizational systems. Automated monitoring techniques can create unintended privacy risks because automated controls may connect to external or otherwise unrelated systems. The matching of records between these systems may create linkages with unintended consequences. Organizations assess and document these risks in their privacy impact assessment and make determinations that are in alignment with their privacy program plan.
Practitioner Notes
Use automated tools that can analyze events in real time and alert you immediately when they detect suspicious activity.
Example 1: Configure your SIEM (Sentinel, Splunk) with real-time correlation rules. When the SIEM sees a failed login followed by a successful login from a different country within 5 minutes (impossible travel), it generates an alert immediately — not during the next morning's log review.
Example 2: Enable automated investigation and response in Microsoft Defender for Endpoint. When a high-confidence threat is detected, the system automatically isolates the machine, collects forensic data, and creates an incident — all within seconds of detection.