Suspicious Device Registration or Join Without MFA (via signinlogs)

title: Suspicious Device Registration or Join Without MFA (via signinlogs)
id: ace9d1c6-e3d5-56d3-90ef-6ccdb4adfb72
status: stable
description: This rule detects device registration or join events where MFA was not performed.
references:
    - https://attack.mitre.org/techniques/T1078/004/
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#device-registrations-and-joins-outside-policy
author: Huntrule Team
date: 2026-06-07
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.stealth
    - attack.t1078.004
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        ResourceDisplayName: 'Device Registration Service'
        conditionalAccessStatus: 'success'
    filter_mfa:
        AuthenticationRequirement: 'multiFactorAuthentication'
    condition: selection and not filter_mfa
falsepositives:
    - Unknown
level: medium