Azure Unusual Authentication Interruption (via signinlogs)

title: Azure Unusual Authentication Interruption (via signinlogs)
id: 3afb64b9-4147-5723-8b26-29d239929479
status: stable
description: This rule detects when there is a interruption in the authentication process.
references:
    - https://attack.mitre.org/techniques/T1078/
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts
author: Huntrule Team
date: 2026-03-14
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.stealth
    - attack.t1078
logsource:
    product: azure
    service: signinlogs
detection:
    selection_50097:
        ResultType: 50097
        ResultDescription: 'Device authentication is required'
    selection_50155:
        ResultType: 50155
        ResultDescription: 'DeviceAuthenticationFailed'
    selection_50158:
        ResultType: 50158
        ResultDescription: 'ExternalSecurityChallenge - External security challenge was not satisfied'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: medium