Azure Sign-in Logs: Conditional Access Blocked Sign-in Failures (ResultType 53003)
Alerts on Azure sign-ins blocked by Conditional Access when requirements are not met.
- Product
- azure
- Service
- signinlogs
- Author
- Yochana Henderson, '@Yochana-H' (SigmaHQ), DRL 1.1
- Published
- 2022-06-01
- Updated
- 2026-07-31
ATT&CK techniques
Initial Access → Cred AccessRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule flags sign-in attempts recorded in Azure sign-in logs as blocked by Conditional Access (ResultType 53003 with the corresponding result description). Attackers may trigger these failures when attempting authentication paths that violate access policies, such as missing required controls or conditional requirements. Detection relies on sign-in log telemetry fields indicating Conditional Access blocking for the attempt.
Reporting behind it
Changelog
v5- v5Candidate ingested via manual entry.2026-07-31
- v4Candidate ingested via manual entry.2026-07-31
- v3Candidate ingested via manual entry.2026-07-31
- v2Candidate ingested via manual entry.2026-07-31
- v1No changelog recorded for this version.2026-07-30
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
title: "Azure Sign-in Logs: Conditional Access Blocked Sign-in Failures (ResultType 53003)"
id: 9f2c71b7-a70f-4c2c-808b-b68a43950bde
status: test
description: This rule flags sign-in attempts recorded in Azure sign-in logs as blocked by Conditional Access (ResultType 53003 with the corresponding result description). Attackers may trigger these failures when attempting authentication paths that violate access policies, such as missing required controls or conditional requirements. Detection relies on sign-in log telemetry fields indicating Conditional Access blocking for the attempt.
references:
- https://learn.microsoft.com/en-gb/entra/architecture/security-operations-privileged-accounts
- https://github.com/SigmaHQ/sigma/blob/master/rules/cloud/azure/signin_logs/azure_conditional_access_failure.yml
author: Yochana Henderson, '@Yochana-H', Huntrule Team
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
license: DRL-1.1
related:
- id: b4a6d707-9430-4f5f-af68-0337f52d5c42
type: derived