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MediumSplunk security contentSteven Dick

O365 Cross-Tenant Access Change

The following analytic identifies when cross-tenant access/synchronization policies are changed in an Azure tenant. Adversaries have been observed altering victim cross-tenant policies as a method of lateral movement…

Description

The following analytic identifies when cross-tenant access/synchronization policies are changed in an Azure tenant. Adversaries have been observed altering victim cross-tenant policies as a method of lateral movement or maintaining persistent access to compromised environments. These policies should be considered sensitive and monitored for changes and/or loose configuration.

Detection logic

Detection requirements

Platform
Identity ProviderWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
office_365_universal_audit_log

Known benign triggers

  • Business approved changes by known administrators.

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