Identifying Ransomware Final Stage activities with KQL Queries

This report provides a practical set of KQL detections for spotting final-stage ransomware activity in Defender XDR/Sentinel, including boot configuration edits (bcdedit), attempts to disable security services, data export and RDP enablement, log and Prefetch cleanup, encryption indicators (known ransomware extensions and shadow copy deletion), and ransom notification artifacts (wallpaper changes and public ransom notes), enabling rapid late-stage detection and response.