New Federated Domain Added — Sigma Rule

Rule metadata and linked tags

Author: Splunk Threat Research Team (original rule), Harjot Singh @cyb3rjy0t (sigma rule). Source status: test; severity: medium. Source dates: 2023-09-18 / not supplied.

{
  "service": "audit",
  "product": "m365"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: c1730f901e0095c8b548c90c747832329e08a2d15872400cb84abc6d727b89d7

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: New Federated Domain Added
id: 58f88172-a73d-442b-94c9-95eaed3cbb36
related:
    - id: 42127bdd-9133-474f-a6f1-97b6c08a4339
      type: similar
status: test
description: Detects the addition of a new Federated Domain.
references:
    - https://research.splunk.com/cloud/e155876a-6048-11eb-ae93-0242ac130002/
    - https://o365blog.com/post/aadbackdoor/
author: Splunk Threat Research Team (original rule), Harjot Singh @cyb3rjy0t (sigma rule)
date: 2023-09-18
tags:
    - attack.privilege-escalation
    - attack.defense-impairment
    - attack.t1484.002
logsource:
    service: audit
    product: m365
detection:
    selection_domain:
        Operation|contains: 'domain'
    selection_operation:
        Operation|contains:
            - 'add'
            - 'new'
    condition: all of selection_*
falsepositives:
    - The creation of a new Federated domain is not necessarily malicious, however these events need to be followed closely, as it may indicate federated credential abuse or backdoor via federated identities at a similar or different cloud provider.
level: medium

Original YAML and metadata in JSON

False positives

• The creation of a new Federated domain is not necessarily malicious, however these events need to be followed closely, as it may indicate federated credential abuse or backdoor via federated identities at a similar or different cloud provider.

Source references

• https://research.splunk.com/cloud/e155876a-6048-11eb-ae93-0242ac130002/
• https://o365blog.com/post/aadbackdoor/