Guest User Invited By Non Approved Inviters — Sigma Rule

Rule metadata and linked tags

Author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'. Source status: test; severity: medium. Source dates: 2022-08-10 / not supplied.

{
  "product": "azure",
  "service": "auditlogs"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1b40e0e22989b9449cade18b92b6809bb58cb863f32e320c45bffb5efc7d6423

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Guest User Invited By Non Approved Inviters
id: 0b4b72e3-4c53-4d5b-b198-2c58cfef39a9
status: test
description: Detects when a user that doesn't have permissions to invite a guest user attempts to invite one.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts#things-to-monitor
author: Mark Morowczynski '@markmorow', Yochana Henderson, '@Yochana-H'
date: 2022-08-10
tags:
    - attack.privilege-escalation
    - attack.initial-access
    - attack.persistence
    - attack.stealth
    - attack.t1078.004
logsource:
    product: azure
    service: auditlogs
detection:
    selection:
        properties.message: Invite external user
        Status: failure
    condition: selection
falsepositives:
    - A non malicious user is unaware of the proper process
level: medium

Original YAML and metadata in JSON

False positives

• A non malicious user is unaware of the proper process

Source references

• https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts#things-to-monitor