Potential Suspicious Registry File Imported Via Reg.EXE — Sigma Rule

Rule metadata and linked tags

Author: frack113, Nasreddine Bencherchali. Source status: test; severity: medium. Source dates: 2022-08-01 / 2023-02-05.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 474ae988dc5006ac83411276e80eebe57e4a518dedf497c457f1359bac3abf17

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: Potential Suspicious Registry File Imported Via Reg.EXE
id: 62e0298b-e994-4189-bc87-bc699aa62d97
related:
    - id: 73bba97f-a82d-42ce-b315-9182e76c57b1
      type: derived
status: test
description: Detects the import of '.reg' files from suspicious paths using the 'reg.exe' utility
references:
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/reg-import
author: frack113, Nasreddine Bencherchali
date: 2022-08-01
modified: 2023-02-05
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1112
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\reg.exe'
        - OriginalFileName: 'reg.exe'
    selection_cli:
        CommandLine|contains: ' import '
    selection_paths:
        CommandLine|contains:
            - 'C:\Users\'
            - '%temp%'
            - '%tmp%'
            - '%appdata%'
            - '\AppData\Local\Temp\'
            - 'C:\Windows\Temp\'
            - 'C:\ProgramData\'
    condition: all of selection_*
falsepositives:
    - Legitimate import of keys
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate import of keys

Source references

• https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/reg-import