Sigma rule: Suspicious SignIns From A Non Registered Device

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-f4072e2142be, updated 2025-07-02T00:00:00.000Z.

Rule

Title
Suspicious SignIns From A Non Registered Device
Status
test
Level
high
Author
Harjot Singh, '@cyb3rjy0t'
Date
2023-01-10
Modified
2025-07-02
File
rules/cloud/azure/signin_logs/azure_ad_risky_sign_ins_with_singlefactorauth_from_unknown_devices.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects risky authentication from a non AD registered device without MFA being required.

Log source

product
azure
service
signinlogs

Detection

selection_main:
    Status: 'Success'
    AuthenticationRequirement: 'singleFactorAuthentication'
    RiskState: 'atRisk'
selection_empty1:
    DeviceDetail.trusttype: ''
selection_empty2:
    DeviceDetail.trusttype: null
condition: selection_main and 1 of selection_empty*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.privilege-escalation
  • attack.persistence
  • attack.initial-access
  • attack.stealth
  • attack.t1078

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/signin_logs/azure_ad_risky_sign_ins_with_singlefactorauth_from_unknown_devices.yml

Sources and licences

  • SigmaHQ

    "Suspicious SignIns From A Non Registered Device" by Harjot Singh, '@cyb3rjy0t' (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/signin_logs/azure_ad_risky_sign_ins_with_singlefactorauth_from_unknown_devices.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious SignIns From A Non Registered Device",
entity page, dataset version ref-f4072e2142be, updated 2025-07-02T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/572b12d4-9062-11ed-a1eb-0242ac120002 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 572b12d4-9062-11ed-a1eb-0242ac120002, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.