Potentially Suspicious Child Process Of WinRAR.EXE (via process_creation)

title: Potentially Suspicious Child Process Of WinRAR.EXE (via process_creation)
id: cb028684-5ea7-5a59-89af-1b680edaf6a9
status: stable
description: This rule detects potentially anomalous child processes of WinRAR.exe.
references:
    - https://attack.mitre.org/techniques/T1203/
    - https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/
    - https://github.com/knight0x07/WinRAR-Code-Execution-Vulnerability-CVE-2023-38831/blob/26ab6c40b6d2c09bb4fc60feaa4a3a90cfd20c23/Part-1-Overview.md
author: Huntrule Team
date: 2026-07-03
tags:
    - attack.execution
    - attack.t1203
logsource:
    category: process_creation
    product: windows
detection:
    selection_parent:
        ParentImage|endswith: '\WinRAR.exe'
    selection_binaries:
        - Image|endswith:
              - '\cmd.exe'
              - '\cscript.exe'
              - '\mshta.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
              - '\regsvr32.exe'
              - '\rundll32.exe'
              - '\wscript.exe'
        - OriginalFileName:
              - 'Cmd.Exe'
              - 'cscript.exe'
              - 'mshta.exe'
              - 'PowerShell.EXE'
              - 'pwsh.dll'
              - 'regsvr32.exe'
              - 'RUNDLL32.EXE'
              - 'wscript.exe'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium