Suspicious Behavior from Anonymous IP Addresses (via threat_management)

title: Suspicious Behavior from Anonymous IP Addresses (via threat_management)
id: dceefce8-394a-59bb-b0a8-95a33db23703
status: stable
description: This rule detects when a Microsoft Cloud App Security reported when users were active from an IP address that has been identified as an anonymous proxy IP address.
references:
    - https://attack.mitre.org/techniques/T1573/
    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy
    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference
author: Huntrule Team
date: 2026-02-18
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    service: threat_management
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'Activity from anonymous IP addresses'
        status: success
    condition: selection
falsepositives:
    - Unknown
level: medium