Detection rules › Sigma
Device Registration or Join Without MFA
Monitor and alert for device registration or join events where MFA was not performed.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Persistence | |
| Privilege Escalation | |
| Stealth |
Telemetry coverage
Rule body
title: Device Registration or Join Without MFA
id: 5afa454e-030c-4ab4-9253-a90aa7fcc581
status: test
description: Monitor and alert for device registration or join events where MFA was not performed.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#device-registrations-and-joins-outside-policy
author: Michael Epping, '@mepples21'
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
Stages and Predicates
Stage 0: condition
selection and not filter_mfaStage 1: selection
selection:
ResourceDisplayName: 'Device Registration Service'
conditionalAccessStatus: 'success'
Stage 2: not filter_mfa
filter_mfa:
AuthenticationRequirement: 'multiFactorAuthentication'
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
AuthenticationRequirement | eq | multiFactorAuthentication | excludes:AuthenticationRequirement field:"AuthenticationRequirement" value:"multiFactorAuthentication" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ResourceDisplayName | eq |
| field:"ResourceDisplayName" kind:eq value:"Device Registration Service" |
conditionalAccessStatus | eq |
| field:"conditionalAccessStatus" kind:eq value:"success" |