How Microsoft Defender XDR Correlates Alerts into Incidents

Security teams often struggle with alert fatigue when large volumes of telemetry bury critical signals. Microsoft Defender XDR's correlation engine addresses this by continuously analyzing alerts across endpoints, identities, email, and cloud apps. It groups alerts that share entities such as users, devices, mailboxes, or IP addresses, or that share artifacts like file hashes or process names. The engine will not merge incidents that are closed, assigned to different analysts, carry conflicting classifications, or span different device groups, and it enforces entity limits to preserve performance. These capabilities support use cases such as detecting multi-stage campaigns and analyzing blast radius, and the article notes their relevance to the SC-200 certification.