New Federated Domain Added - Exchange

Title: New Federated Domain Added - Exchange
Status: test
Description:Detects the addition of a new Federated Domain.
References:
  -https://www.fireeye.com/content/dam/fireeye-www/blog/pdfs/wp-m-unc2452-2021-000343-01.pdf
  -https://us-cert.cisa.gov/ncas/alerts/aa21-008a
  -https://www.splunk.com/en_us/blog/security/a-golden-saml-journey-solarwinds-continued.html
  -https://www.sygnia.co/golden-saml-advisory
  -https://o365blog.com/post/aadbackdoor/
Author: Splunk Threat Research Team (original rule), '@ionsor (rule)'
Date: 2022-02-08
modified:None
Tags:

• -'attack.persistence'
• -'attack.t1136.003'

Logsource:

• service: exchange
• product: m365

Detection:
  selection:
    eventSource: 'Exchange'
    eventName: 'Add-FederatedDomain'
    status: 'success'
  condition: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