Sigma rule: Windows Mail App Mailbox Access Via PowerShell Script

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-3f0af574f305, updated 2023-07-08T00:00:00.000Z.

Rule

Title
Windows Mail App Mailbox Access Via PowerShell Script
Status
test
Level
medium
Author
frack113
Date
2023-07-08
File
rules-threat-hunting/windows/powershell/powershell_script/posh_ps_mailbox_access.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects PowerShell scripts that try to access the default Windows MailApp MailBox. This indicates manipulation of or access to the stored emails of a user. E.g. this could be used by an attacker to exfiltrate or delete the content of the emails.

Log source

product
windows
category
ps_script
definition
bade5735-5ab0-4aa7-a642-a11be0e40872

Detection

selection:
    ScriptBlockText|contains: '\Comms\Unistore\data'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1070.008
  • detection.threat-hunting

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-threat-hunting/windows/powershell/powershell_script/posh_ps_mailbox_access.yml

Sources and licences

  • SigmaHQ

    "Windows Mail App Mailbox Access Via PowerShell Script" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-threat-hunting/windows/powershell/powershell_script/posh_ps_mailbox_access.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: Windows Mail App Mailbox Access Via PowerShell Script",
entity page, dataset version ref-3f0af574f305, updated 2023-07-08T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/4e485d01-e18a-43f6-a46b-ef20496fa9d3 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 4e485d01-e18a-43f6-a46b-ef20496fa9d3, 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.