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Entra ID Phishing Kit 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 "10.0.19045.2006". This is the frozen default device profile observed when adversary-in-the-middle (AiTM) phishing kits such as Tycoon2FA and Kali365 register Azure AD-joined devices after capturing a victim session, in order to acquire a Primary Refresh Token (PRT) and establish persistence. The build is hardcoded by the tooling and differs from legitimate hosts: a patched Windows 10 22H2 device reports a far higher "10.0.19045.<revision>" value, so a device frozen at ".2006" with a default name is a high-fidelity, though evadable, indicator.

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 register devices with this OS profile 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 never-patched Windows 10 22H2 hosts may legitimately report the `10.0.19045.2006` build with a default "DESKTOP-" host name. Validate against your device inventory and patch baseline before escalating.

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