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
edit## Config 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/