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Entra ID Device with ROADtools Default OS Build (Entity Analytics)

Identifies the first occurrence of a Microsoft Entra ID device, surfaced through the Entra ID Entity Analytics device inventory, whose host name follows the default "DESKTOP-" pattern and whose operating system build…

Description

Identifies the first occurrence of a Microsoft Entra ID device, surfaced through the Entra ID Entity Analytics device inventory, whose host name follows the default "DESKTOP-" pattern and whose operating system build is `10.0.19041.928`. This combination is the default device profile that ROADtools (roadtx) uses when registering a device, and the OS build typically differs from the patched OS versions of legitimate hosts in the environment. Adversaries register rogue devices in Entra ID to acquire a Primary Refresh Token (PRT), establish persistence, and obtain trusted, programmatic access to the tenant. Because the OS build is a tool default, this is a high-fidelity but evadable indicator; baseline approved device builds and naming conventions before relying on it.

Detection logic

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
event_index

Known benign triggers

  • Authorized red team or penetration testing engagements that use ROADtools to register devices will appear in the device inventory and match this rule. If this is expected, add exceptions for the specific host names or device IDs.
  • Unmanaged or imaged Windows 10 20H1 hosts may legitimately report the `10.0.19041.928` build with a default "DESKTOP-" host name. Validate against your device inventory and patch baseline before escalating.

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