Identifies when a transport rule has been disabled or deleted in Microsoft 365. Mail flow rules (also known as transport rules) are used to identify and take action on messages that flow through your organization. An adversary or insider threat may modify a transport rule to exfiltrate data or evade defenses.
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
A transport rule may be modified 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:Exchange and event.category:web and event.action:("Remove-TransportRule" or "Disable-TransportRule") and event.outcome:success
Framework: MITRE ATT&CKTM
- Version 2 (7.11.2 release)
- Formatting only