Identifies the assignment of rights to accesss content from another mailbox. An adversary may use the compromised account to send messages to other accounts in the network of the target business while creating inbox rules, so messages can evade spam/phishing detection mechanisms.
Rule type: query
Risk score: 21
Runs every: 5 minutes
Maximum alerts per execution: 100
- Microsoft 365
- Continuous Monitoring
- Configuration Audit
Added (Elastic Stack release): 7.16.0
Rule authors: Elastic, Austin Songer
Rule license: Elastic License v2
Assignment of rights to a service account.
## Config The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
event.dataset:o365.audit and event.provider:Exchange and event.action:Add-MailboxPermission and o365.audit.Parameters.AccessRights:(FullAccess or SendAs or SendOnBehalf) and event.outcome:success