Sigma rule: Remove Exported Mailbox from Exchange Webserver

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-0ac1bc1e935f, updated 2023-01-23T00:00:00.000Z.

Rule

Title
Remove Exported Mailbox from Exchange Webserver
Status
test
Level
high
Author
Christian Burkard (Nextron Systems)
Date
2021-08-27
Modified
2023-01-23
File
rules/windows/builtin/msexchange/win_exchange_proxyshell_remove_mailbox_export.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects removal of an exported Exchange mailbox which could be to cover tracks from ProxyShell exploit

Log source

product
windows
service
msexchange-management

Detection

keywords:
    '|all':
        - 'Remove-MailboxExportRequest'
        - ' -Identity '
        - ' -Confirm "False"'
condition: keywords

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1070

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/msexchange/win_exchange_proxyshell_remove_mailbox_export.yml

Sources and licences

  • SigmaHQ

    "Remove Exported Mailbox from Exchange Webserver" by Christian Burkard (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/msexchange/win_exchange_proxyshell_remove_mailbox_export.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Remove Exported Mailbox from Exchange Webserver",
entity page, dataset version ref-0ac1bc1e935f, updated 2023-01-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/09570ae5-889e-43ea-aac0-0e1221fb3d95 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 09570ae5-889e-43ea-aac0-0e1221fb3d95, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.