Azure risk detection: Malicious IP sign-in risk event based on sign-in failure rate

Flags Azure risk events for sign-ins associated with malicious IPs using maliciousIPAddress failure-rate indications.

FreeReviewedSigma · High · v5

Product: azure
Service: riskdetection
Author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo' (SigmaHQ), DRL 1.1
Published: 2023-09-07
Updated: 2026-07-31

ATT&CK techniques

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1090Proxy
Exfiltration
Impact

What it detects

This rule flags Azure risk events where the risk event type is set to maliciousIPAddress. It indicates sign-in activity originating from an IP address classified as malicious, which attackers may use to probe accounts or attempt credential access. The detection relies on Azure risk detection telemetry that records the riskEventType value for these events.

Reporting behind it

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Azure risk detection: Malicious IP sign-in risk event based on sign-in failure rate

Pivot detection · T1090 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No 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.

azure-risk-detections-malicious-ip-sign-in-failure-rate-a3f55ebd

title: "Azure risk detection: Malicious IP sign-in risk event based on sign-in failure rate"
id: f6e33e6a-a4e2-4a3e-898c-15f00679b4ba
status: test
description: This rule flags Azure risk events where the risk event type is set to maliciousIPAddress. It indicates sign-in activity originating from an IP address classified as malicious, which attackers may use to probe accounts or attempt credential access. The detection relies on Azure risk detection telemetry that records the riskEventType value for these events.
references:
  - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#malicious-ip-address
  - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
  - https://github.com/SigmaHQ/sigma/blob/master/rules/cloud/azure/identity_protection/azure_identity_protection_malicious_ip_address.yml
author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo', Huntrule Team
date: 2023-09-07
tags:
  - attack.t1090
  - attack.command-and-control
logsource:
  product: azure
  service: riskdetection
detection:
  selection:
    riskEventType: maliciousIPAddress
  condition: selection
falsepositives:
  - We recommend investigating the sessions flagged by this detection in the context of other sign-ins from the user.
level: high
license: DRL-1.1
related:
  - id: a3f55ebd-0c01-4ed6-adc0-8fb76d8cd3cd
    type: derived

Convert

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