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Sigma detection rules

1 rules indexed · SIEM-agnostic detection content
Sigma is the open generic signature format for SIEM systems. Each rule below converts to native syntax for Splunk, Elastic, Sentinel, and other SIEMs. Expand any rule to see its raw YAML.

Detection rules

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medium
Microsoft 365 - User Restricted from Sending Email
Detects when a Security Compliance Center reported a user who exceeded sending limits of the service policies and because of this has been restricted from sending email.
status test author austinsonger id ff246f56-7f24-402a-baca-b86540e3925c
view Sigma YAML
title: Microsoft 365 - User Restricted from Sending Email
id: ff246f56-7f24-402a-baca-b86540e3925c
status: test
description: Detects when a Security Compliance Center reported a user who exceeded sending limits of the service policies and because of this has been restricted from sending email.
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: austinsonger
date: 2021-08-19
modified: 2022-10-09
tags:
    - attack.initial-access
    - attack.t1199
logsource:
    service: threat_management
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'User restricted from sending email'
        status: success
    condition: selection
falsepositives:
    - Unknown
level: medium
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