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Detection rules › Sigma

New Federated Domain Added

Status
test
Severity
medium
Log source
product m365, service audit
Author
Splunk Threat Research Team (original rule), Harjot Singh @cyb3rjy0t (sigma rule)
Source
github.com/SigmaHQ/sigma

Detects the addition of a new Federated Domain.

MITRE ATT&CK coverage

TacticTechniques
Privilege EscalationT1484.002 Domain or Tenant Policy Modification: Trust Modification
Defense ImpairmentT1484.002 Domain or Tenant Policy Modification: Trust Modification

Rule body yaml

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

Stages and Predicates

Stage 0: condition

all of selection_*

Stage 1: selection_domain

selection_domain:
    Operation|contains: 'domain'

Stage 2: selection_operation

selection_operation:
    Operation|contains:
        - 'add'
        - 'new'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Operationmatch
  • add
  • domain
  • new