Domain Policy Modification: Domain Trust Modification
Adversaries may add new domain trusts or modify the properties of existing domain trusts to evade defenses and/or elevate privileges. Domain trust details, such as whether or not a domain is federated, allow authentication and authorization properties to apply between domains for the purpose of accessing shared resources. These trust objects may include accounts, credentials, and other authentication material applied to servers, tokens, and domains.
Manipulating the domain trusts may allow an adversary to escalate privileges and/or evade defenses by modifying settings to add objects which they control. For example, this may be used to forge SAML Tokens, without the need to compromise the signing certificate to forge new credentials. Instead, an adversary can manipulate domain trusts to add their own signing certificate.
|Privileged Account Management||
Use the principal of least privilege and protect administrative access to domain trusts.
Monitor for modifications to domain trust settings, such as when a user or application modifies the federation settings on the domain or updates domain authentication from Managed to Federated via ActionTypes
Set federation settings on domain and
Set domain authentication. This may also include monitoring for Event ID 307 which can be correlated to relevant Event ID 510 with the same Instance ID for change details.
Monitor for PowerShell commands such as:
Update-MSOLFederatedDomain –DomainName: "Federated Domain Name", or
Update-MSOLFederatedDomain –DomainName: "Federated Domain Name" –supportmultipledomain.
- Microsoft. (2018, November 28). What is federation with Azure AD?. Retrieved December 30, 2020.
- Microsoft 365 Defender Team. (2020, December 28). Using Microsoft 365 Defender to protect against Solorigate. Retrieved January 7, 2021.
- Microsoft. (2020, December). Azure Sentinel Detections. Retrieved December 30, 2020.
- Sygnia. (2020, December). Detection and Hunting of Golden SAML Attack. Retrieved January 6, 2021.
- CISA. (2021, January 8). Detecting Post-Compromise Threat Activity in Microsoft Cloud Environments. Retrieved January 8, 2021.
- Microsoft. (2020, September 14). Update or repair the settings of a federated domain in Office 365, Azure, or Intune. Retrieved December 30, 2020.