User Access Blocked by Azure Conditional Access

Status: test
Severity: medium
Log source: product azure, service signinlogs
Author: AlertIQ
Source: github.com/SigmaHQ/sigma

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.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1078.004` Valid Accounts: Cloud Accounts
Persistence	`T1078.004` Valid Accounts: Cloud Accounts
Privilege Escalation	`T1078.004` Valid Accounts: Cloud Accounts
Stealth	`T1078.004` Valid Accounts: Cloud Accounts
Credential Access	`T1110` Brute Force

Telemetry coverage

Platform	Record / event type
Entra ID	`SigninLogs` sign-in event: Sign-in blocked by Conditional Access

Rules detecting the same action

These rules filter on the same operation.

Sign-in Failure Due to Conditional Access Requirements Not Met (Sigma)

Rule body

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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ResultType: 53003

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ResultType`	eq	`53003`	`field:"ResultType" kind:eq value:"53003"`