User Access Blocked by Azure Conditional Access — Sigma Rule

Rule metadata and linked tags

Author: AlertIQ. Source status: test; severity: medium. Source dates: 2021-10-10 / 2022-12-25.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2451e3cdcd234fde35e35ebcffa38abe9256c399c6caebe8eca57b4af41282a0

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: User Access Blocked by Azure Conditional Access
id: 9a60e676-26ac-44c3-814b-0c2a8b977adf
status: test
description: |
    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.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts
author: AlertIQ
date: 2021-10-10
modified: 2022-12-25
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.credential-access
    - attack.initial-access
    - attack.stealth
    - attack.t1110
    - attack.t1078.004
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        ResultType: 53003
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts