Disabled MFA to Bypass Authentication Mechanisms — Sigma Rule

Rule metadata and linked tags

Author: @ionsor. Source status: test; severity: medium. Source dates: 2022-02-08 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: eba9a7eefe54f4509de6cb6f14db7abd6b583a78e72c26e733bc17935b8656e7

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: Disabled MFA to Bypass Authentication Mechanisms
id: 7ea78478-a4f9-42a6-9dcd-f861816122bf
status: test
description: Detection for when multi factor authentication has been disabled, which might indicate a malicious activity to bypass authentication mechanisms.
references:
    - https://learn.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-userstates
author: '@ionsor'
date: 2022-02-08
tags:
    - attack.credential-access
    - attack.persistence
    - attack.defense-impairment
    - attack.t1556
logsource:
    product: azure
    service: activitylogs
detection:
    selection:
        eventSource: AzureActiveDirectory
        eventName: 'Disable Strong Authentication.'
        status: success
    condition: selection
falsepositives:
    - Authorized modification by administrators
level: medium

Original YAML and metadata in JSON

False positives

• Authorized modification by administrators

Source references

• https://learn.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-userstates