Sigma rule: Azure Unusual Authentication Interruption

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-0c4383302504, updated 2022-12-18T00:00:00.000Z.

Rule

Title
Azure Unusual Authentication Interruption
Status
test
Level
medium
Author
Austin Songer @austinsonger
Date
2021-11-26
Modified
2022-12-18
File
rules/cloud/azure/signin_logs/azure_unusual_authentication_interruption.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when there is a interruption in the authentication process.

Log source

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_*

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_unusual_authentication_interruption.yml

Sources and licences

  • SigmaHQ

    "Azure Unusual Authentication Interruption" by Austin Songer @austinsonger (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/signin_logs/azure_unusual_authentication_interruption.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: Azure Unusual Authentication Interruption",
entity page, dataset version ref-0c4383302504, updated 2022-12-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/8366030e-7216-476b-9927-271d79f13cf3 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 8366030e-7216-476b-9927-271d79f13cf3, 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.