Azure Sign-In Logs: Device Registration or Join Success Without MFA

Flags successful device registration/join attempts in Azure when MFA was not performed per Conditional Access.

FreeReviewedSigma · Medium · v5

Product: azure
Service: signinlogs
Author: Michael Epping, '@mepples21' (SigmaHQ), DRL 1.1
Published: 2022-06-28
Updated: 2026-07-31

ATT&CK techniques

Initial Access → Defense Evasion

Recon
Resource Dev
Initial Access
- T1078.004Cloud Accounts
Execution
Persistence
- T1078.004Cloud Accounts
Priv Esc
- T1078.004Cloud Accounts
Defense Evasion
- T1078.004Cloud Accounts
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule identifies successful device registration or device join events in Azure sign-in logs where MFA was not performed. Attackers can use device registration without MFA to establish persistence or initial access while reducing friction from authentication controls. The detection relies on sign-in log fields indicating a successful device registration/join service and the absence of multiFactorAuthentication in the authentication requirement telemetry.

Reporting behind it

Related detections9 linkedT1078.004 — drag to rearrange

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Azure Sign-In Logs: Device Registration or Join Success Without MFA

Pivot detection · T1078.004 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

azure-sign-in-logs-device-registration-or-join-successful-without-mfa-5afa454e

title: "Azure Sign-In Logs: Device Registration or Join Success Without MFA"
id: 8e2fbdf4-c618-458d-9bab-076abf78809a
status: test
description: This rule identifies successful device registration or device join events in Azure sign-in logs where MFA was not performed. Attackers can use device registration without MFA to establish persistence or initial access while reducing friction from authentication controls. The detection relies on sign-in log fields indicating a successful device registration/join service and the absence of multiFactorAuthentication in the authentication requirement telemetry.
references:
  - https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#device-registrations-and-joins-outside-policy
  - https://github.com/SigmaHQ/sigma/blob/master/rules/cloud/azure/signin_logs/azure_ad_device_registration_or_join_without_mfa.yml
author: Michael Epping, '@mepples21', Huntrule Team
date: 2022-06-28
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
license: DRL-1.1
related:
  - id: 5afa454e-030c-4ab4-9253-a90aa7fcc581
    type: derived

Convert

This rule as a query you can run. Uses no unlock credit.

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