huntrule

Exchange Management: Removal of Mailbox Export Request via Remove-MailboxExportRequest

Detects Exchange management removals of mailbox export requests using Remove-MailboxExportRequest with Confirm set to "False".

FreeReviewedSigma · High · v2
Product
windows
Service
msexchange-management
Author
Christian Burkard (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2021-08-27
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags Exchange Management activity where a mailbox export request is removed using the Remove-MailboxExportRequest command with an identity parameter and confirmation set to false. Attackers can use mailbox export workflows to stage or move data and may remove export requests afterward to reduce evidence. It relies on service telemetry from the Exchange management interface capturing the specific command string and its parameters.

Reporting behind it

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Windows Process Creation: Command-Line Deletion of IIS Logs
Kubernetes Audit: Deleted Events
Linux Package Removal via yum, apt, dpkg, or rpm Commands
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Exchange Management: Removal of Mailbox Export Request via Remove-MailboxExportRequest
Pivot detection · T1070 · 9 related

Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. v1
    No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.