Sigma rule: User Access Blocked by Azure Conditional Access

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-ca9a21175f96, updated 2022-12-25T00:00:00.000Z.

Rule

Title
User Access Blocked by Azure Conditional Access
Status
test
Level
medium
Author
AlertIQ
Date
2021-10-10
Modified
2022-12-25
File
rules/cloud/azure/signin_logs/azure_user_login_blocked_by_conditional_access.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detect access has been blocked by Conditional Access policies.
The access policy does not allow token issuance which might be sights≈ of unauthorizeed login to valid accounts.

Log source

product
azure
service
signinlogs

Detection

selection:
    ResultType: 53003
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.privilege-escalation
  • attack.persistence
  • attack.credential-access
  • attack.initial-access
  • attack.stealth
  • attack.t1110
  • attack.t1078.004

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_user_login_blocked_by_conditional_access.yml

Sources and licences

  • SigmaHQ

    "User Access Blocked by Azure Conditional Access" by AlertIQ (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/signin_logs/azure_user_login_blocked_by_conditional_access.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: User Access Blocked by Azure Conditional Access",
entity page, dataset version ref-ca9a21175f96, updated 2022-12-25T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9a60e676-26ac-44c3-814b-0c2a8b977adf (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9a60e676-26ac-44c3-814b-0c2a8b977adf, 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.