Custom File Open Handler Executes PowerShell — Sigma Rule

Rule metadata and linked tags

Author: CD_R0M_. Source status: test; severity: high. Source dates: 2022-06-11 / 2023-08-17.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b9adfed25e6fe2a6a03d8741fca59d48517cbc0d7aab085e45174abda2832fe5

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Custom File Open Handler Executes PowerShell
id: 7530b96f-ad8e-431d-a04d-ac85cc461fdc
status: test
description: Detects the abuse of custom file open handler, executing powershell
references:
    - https://news.sophos.com/en-us/2022/02/01/solarmarker-campaign-used-novel-registry-changes-to-establish-persistence/?cmp=30728
author: CD_R0M_
date: 2022-06-11
modified: 2023-08-17
tags:
    - attack.stealth
    - attack.t1202
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: 'shell\open\command\'
        Details|contains|all:
            - 'powershell'
            - '-command'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

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