Sigma rule: Suspicious PowerShell Mailbox Export to Share

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-df3c6eaf71f1, updated 2022-10-26T00:00:00.000Z.

Rule

Title
Suspicious PowerShell Mailbox Export to Share
Status
test
Level
critical
Author
Florian Roth (Nextron Systems)
Date
2021-08-07
Modified
2022-10-26
File
rules/windows/process_creation/proc_creation_win_powershell_mailboxexport_share.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of the powerShell New-MailboxExportRequest Cmdlet to exports a mailbox to a remote or local share, as used in ProxyShell exploitations

Log source

product
windows
category
process_creation

Detection

selection:
    CommandLine|contains|all:
        - 'New-MailboxExportRequest'
        - ' -Mailbox '
        - ' -FilePath \\\\'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.exfiltration

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/process_creation/proc_creation_win_powershell_mailboxexport_share.yml

Sources and licences

  • SigmaHQ

    "Suspicious PowerShell Mailbox Export to Share" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_powershell_mailboxexport_share.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: Suspicious PowerShell Mailbox Export to Share",
entity page, dataset version ref-df3c6eaf71f1, updated 2022-10-26T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/889719ef-dd62-43df-86c3-768fb08dc7c0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 889719ef-dd62-43df-86c3-768fb08dc7c0, 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.