Sign-ins by Unknown Devices — Sigma Rule

Rule metadata and linked tags

Author: Michael Epping, '@mepples21'. Source status: test; severity: low. Source dates: 2022-06-28 / 2022-10-05.

{
  "product": "azure",
  "service": "signinlogs"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b00e432ee9987c0d89e2941e45a7105ee2c9fb37bd67d3ef5a59687989d4ae39

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Sign-ins by Unknown Devices
id: 4d136857-6a1a-432a-82fc-5dd497ee5e7c
status: test
description: Monitor and alert for Sign-ins by unknown devices from non-Trusted locations.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#non-compliant-device-sign-in
author: Michael Epping, '@mepples21'
date: 2022-06-28
modified: 2022-10-05
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.stealth
    - attack.t1078.004
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        AuthenticationRequirement: singleFactorAuthentication
        ResultType: 0
        NetworkLocationDetails: '[]'
        DeviceDetail.deviceId: ''
    condition: selection
falsepositives:
    - Unknown
level: low

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#non-compliant-device-sign-in