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Entra ID Register Device with Phishing Kit or ROADtools User Agent

Detects a successful Microsoft Entra ID Register device audit event for an Azure AD join or Azure AD register whose user agent is a Dsreg client string hardcoded by device-registration tooling. "Dsreg/10.0 (Windows…

Description

Detects a successful Microsoft Entra ID Register device audit event for an Azure AD join or Azure AD register whose user agent is a Dsreg client string hardcoded by device-registration tooling. "Dsreg/10.0 (Windows 10.0.19045.2006)" is the frozen user agent used by device code and adversary-in-the-middle (AiTM) phishing-as-a-service kits such as Tycoon2FA and Kali365 when they register a device after capturing a victim session. "Dsreg/10.0 (Windows 10.0.19041.928)" is the default user agent used by ROADtools (roadtx) for Windows device registration. Adversaries register these devices to obtain a Primary Refresh Token (PRT) and persist access that survives password resets and user-level session revocation.

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

  • A legitimate, never-patched Windows 10 host at build `10.0.19041.928` (20H1) or `10.0.19045.2006` (22H2) can present the same Dsreg user agent during a genuine Azure AD join or register. Validate the device name, owner, and patch level against your device inventory before escalating.
  • Authorized red team or penetration testing that uses ROADtools or phishing-kit infrastructure to register devices will match this rule. If this is expected, add exceptions for the specific user principal names, source IPs, or device names involved.

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