Microsoft 365 New Inbox Rule Created
editMicrosoft 365 New Inbox Rule Created
editIdentifies when a new Inbox rule is created in Microsoft 365. Inbox rules process messages in the Inbox based on conditions and take actions, such as moving a message to a specified folder or deleting a message. Adequate permissions are required on the mailbox to create an Inbox rule.
Rule type: query
Rule indices:
- filebeat-*
- logs-o365*
Severity: low
Risk score: 21
Runs every: 5 minutes
Searches indices from: now-30m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
- https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/responding-to-a-compromised-email-account?view=o365-worldwide
- https://docs.microsoft.com/en-us/powershell/module/exchange/new-inboxrule?view=exchange-ps
- https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/detect-and-remediate-outlook-rules-forms-attack?view=o365-worldwide
Tags:
- Elastic
- Cloud
- Microsoft 365
- Continuous Monitoring
- SecOps
- Configuration Audit
Version: 1
Added (Elastic Stack release): 7.13.0
Rule authors: Elastic, Gary Blackwell, Austin Songer
Rule license: Elastic License v2
Potential false positives
editAn inbox rule may be created by a system or network administrator. Verify that the configuration change was expected. Exceptions can be added to this rule to filter expected behavior.
Investigation guide
editConfig
The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
Rule query
editevent.dataset:o365.audit and event.provider:Exchange and event.category:web and event.action:"New-InboxRule" and event.outcome:success
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Collection
- ID: TA0009
- Reference URL: https://attack.mitre.org/tactics/TA0009/
-
Technique:
- Name: Email Collection
- ID: T1114
- Reference URL: https://attack.mitre.org/techniques/T1114/