Anomalous First-Time Device Logon
Identifies anomalous device logon events from Microsoft Defender for Endpoint (MDE) where a user connects to a device for the first time or a device connects from a new IP address. The query filters high-priority…
Description
Identifies anomalous device logon events from Microsoft Defender for Endpoint (MDE) where a user connects to a device for the first time or a device connects from a new IP address. The query filters high-priority anomalies and provides key details such as timestamp, action type, source IP, location, and associated user, device, and activity insights for investigation.
Detection logic
Detection requirements
- Platform
- ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
- Log source product
- behavioranalytics
- Log source service
- behavioranalytics
MITRE ATT&CK mappings
0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.
No references are available for this detection.
From the source
- At source
- Open at source
- Upstream identifier
- c3d4e5f6-g7h8-9012-cdef-gh3456789012
- Tagged by the source as
- InitialAccessLateralMovement
Licence
- Published under
- MIT LicenseRead the licence
- Attribution
- Required
- Obtained under
- MITRead the origin licence
Authorship
- Published
- Sep 1, 2026
- Version
- 1