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.
Rule type: query
Risk score: 47
Runs every: 5 minutes
Maximum alerts per execution: 100
- Microsoft 365
- Continuous Monitoring
- Configuration Audit
Version: 2 (version history)
Added (Elastic Stack release): 7.11.0
Last modified (Elastic Stack release): 7.11.2
Rule authors: Elastic
Rule license: Elastic License
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.
The Microsoft 365 Fleet integration or Filebeat module must be enabled to use this rule.
event.dataset:o365.audit and event.provider:(SkypeForBusiness or MicrosoftTeams) and event.category:web and event.action:"Set- CsTeamsClientConfiguration" and o365.audit.Parameters.AllowGuestUser:True and event.outcome:success
Framework: MITRE ATT&CKTM
- Version 2 (7.11.2 release)
- Formatting only