Detection catalogue

Explore published rules with transparent provenance, licensing, and ATT&CK mappings.

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Deprecated - M365 Teams Guest Access Enabled

Identifies when guest access is enabled in Microsoft Teams. Guest access in Teams allows people outside the organization to access teams and channels. An adversary may enable guest access to maintain persistence in an environment.

ATT&CK coverage

Outside the enterprise matrix

Detection requirements

Log source category: event_index

What the source says

What fires this without an attack behind it

Teams guest access may be enabled by a system or network administrator. Verify that the configuration change was expected. Exceptions can be added to this rule to filter expected behavior.

References

https://docs.microsoft.com/en-us/powershell/module/skype/get-csteamsclientconfiguration?view=skype-ps

Tagged by the source as

Data Source: Microsoft 365Domain: CloudResources: Investigation GuideTactic: PersistenceUse Case: Configuration Audit

Detection logic

Published to signed-in readers

The query as its source wrote it, its canonical form, and the content hash that pins this exact revision.