Sigma rule: Custom File Open Handler Executes PowerShell

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-26dc878beba1, updated 2023-08-17T00:00:00.000Z.

Rule

Title: Custom File Open Handler Executes PowerShell
Status: test
Level: high
Author: CD_R0M_
Date: 2022-06-11
Modified: 2023-08-17
File: rules/windows/registry/registry_set/registry_set_custom_file_open_handler_powershell_execution.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the abuse of custom file open handler, executing powershell

Log source

product: windows
category: registry_set

Detection

selection:
    TargetObject|contains: 'shell\open\command\'
    Details|contains|all:
        - 'powershell'
        - '-command'
condition: selection

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

T1202

References

https://news.sophos.com/en-us/2022/02/01/solarmarker-campaign-used-novel-registry-changes-to-establish-persistence/?cmp=30728

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/registry/registry_set/registry_set_custom_file_open_handler_powershell_execution.yml

Sources and licences

SigmaHQ
"Custom File Open Handler Executes PowerShell" by CD_R0M_ (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_custom_file_open_handler_powershell_execution.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: Custom File Open Handler Executes PowerShell",
entity page, dataset version ref-26dc878beba1, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/7530b96f-ad8e-431d-a04d-ac85cc461fdc (accessed 2026-11-03).
Underlying source: SigmaHQ rule 7530b96f-ad8e-431d-a04d-ac85cc461fdc, 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.