Activity from Suspicious IP Addresses

Status: test
Severity: medium
Log source: product m365, service threat_detection
Author: Austin Songer @austinsonger
Source: github.com/SigmaHQ/sigma

Detects when a Microsoft Cloud App Security reported users were active from an IP address identified as risky by Microsoft Threat Intelligence. These IP addresses are involved in malicious activities, such as Botnet C&C, and may indicate compromised account.

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1573` Encrypted Channel

Telemetry coverage

Platform	Record / event type
Microsoft 365	Activity from suspicious IP addresses

Rule body

title: Activity from Suspicious IP Addresses
id: a3501e8e-af9e-43c6-8cd6-9360bdaae498
status: test
description: |
  Detects when a Microsoft Cloud App Security reported users were active from an IP address identified as risky by Microsoft Threat Intelligence.
  These IP addresses are involved in malicious activities, such as Botnet C&C, and may indicate compromised account.
references:
    - 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: Austin Songer @austinsonger
date: 2021-08-23
modified: 2022-10-09
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    service: threat_detection
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'Activity from suspicious IP addresses'
        status: success
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    eventSource: SecurityComplianceCenter
    eventName: 'Activity from suspicious IP addresses'
    status: success

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`eventName`	eq	`Activity from suspicious IP addresses`	`field:"aws::eventName" kind:eq value:"Activity from suspicious IP addresses"`
`eventSource`	eq	`SecurityComplianceCenter`	`field:"aws::eventSource" kind:eq value:"SecurityComplianceCenter"`
`status`	eq	`success`	`field:"status" kind:eq value:"success"`