Sigma rule: Multifactor Authentication Denied

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c93c0357ff27, updated 2022-03-24T00:00:00.000Z.

Rule

Title
Multifactor Authentication Denied
Status
test
Level
medium
Author
AlertIQ
Date
2022-03-24
File
rules/cloud/azure/signin_logs/azure_mfa_denies.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

User has indicated they haven't instigated the MFA prompt and could indicate an attacker has the password for the account.

Log source

product
azure
service
signinlogs

Detection

selection:
    AuthenticationRequirement: 'multiFactorAuthentication'
    Status|contains: 'MFA Denied'
condition: selection

False positives (as the rule lists them)

  • Users actually login but miss-click into the Deny button when MFA prompt.

Tags

  • attack.privilege-escalation
  • attack.persistence
  • attack.initial-access
  • attack.credential-access
  • attack.stealth
  • attack.t1078.004
  • attack.t1110
  • attack.t1621

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_mfa_denies.yml

Sources and licences

  • SigmaHQ

    "Multifactor Authentication Denied" by AlertIQ (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/signin_logs/azure_mfa_denies.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: Multifactor Authentication Denied",
entity page, dataset version ref-c93c0357ff27, updated 2022-03-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e40f4962-b02b-4192-9bfe-245f7ece1f99 (accessed 2026-11-03).
Underlying source: SigmaHQ rule e40f4962-b02b-4192-9bfe-245f7ece1f99, 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.