Sign-in Failure Due to Conditional Access Requirements Not Met — Sigma Rule

Rule metadata and linked tags

Author: Yochana Henderson, '@Yochana-H'. Source status: test; severity: high. Source dates: 2022-06-01 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: dec1132f9b4dde066633a4ef80fa2ec41046e79aba841296a52a2b13970cb5d5

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: Sign-in Failure Due to Conditional Access Requirements Not Met
id: b4a6d707-9430-4f5f-af68-0337f52d5c42
status: test
description: Define a baseline threshold for failed sign-ins due to Conditional Access failures
references:
    - https://learn.microsoft.com/en-gb/entra/architecture/security-operations-privileged-accounts
author: Yochana Henderson, '@Yochana-H'
date: 2022-06-01
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.credential-access
    - attack.stealth
    - attack.t1110
    - attack.t1078.004
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        ResultType: 53003
        Resultdescription: Blocked by Conditional Access
    condition: selection
falsepositives:
    - Service Account misconfigured
    - Misconfigured Systems
    - Vulnerability Scanners
level: high

Original YAML and metadata in JSON

False positives

• Service Account misconfigured
• Misconfigured Systems
• Vulnerability Scanners

Source references

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