Use NTFS Short Name in Image

Description

Detect use of the Windows 8.3 short name. Which could be used as a method to avoid Image based detection

Query · sigma

selection:
  Image|contains:
  - ~1.bat
  - ~1.dll
  - ~1.exe
  - ~1.hta
  - ~1.js
  - ~1.msi
  - ~1.ps1
  - ~1.tmp
  - ~1.vbe
  - ~1.vbs
  - ~2.bat
  - ~2.dll
  - ~2.exe
  - ~2.hta
  - ~2.js
  - ~2.msi
  - ~2.ps1
  - ~2.tmp
  - ~2.vbe
  - ~2.vbs
filter_main_generic_parent:
  ParentImage: C:\Windows\explorer.exe
filter_optional_webex:
  ParentImage|endswith: \WebEx\WebexHost.exe
filter_optional_thor:
  ParentImage|endswith: \thor\thor64.exe
filter_optional_winzip:
  Image: C:\PROGRA~1\WinZip\WZPREL~1.EXE
filter_optional_vcred:
  Image|endswith: \VCREDI~1.EXE
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*

Known false positives

  • Software Installers
Raw source Use NTFS Short Name in Image · Sigma
Esc
Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Use NTFS Short Name in Image
id: 3ef5605c-9eb9-47b0-9a71-b727e6aa5c3b
related:
    - id: dd6b39d9-d9be-4a3b-8fe0-fe3c6a5c1795
      type: similar
status: test
description: Detect use of the Windows 8.3 short name. Which could be used as a method to avoid Image based detection
references:
    - https://www.acunetix.com/blog/articles/windows-short-8-3-filenames-web-security-problem/
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-2000-server/cc959352(v=technet.10)
    - https://twitter.com/jonasLyk/status/1555914501802921984
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-06
modified: 2023-07-20
tags:
    - attack.stealth
    - attack.t1564.004
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|contains:
            - '~1.bat'
            - '~1.dll'
            - '~1.exe'
            - '~1.hta'
            - '~1.js'
            - '~1.msi'
            - '~1.ps1'
            - '~1.tmp'
            - '~1.vbe'
            - '~1.vbs'
            - '~2.bat'
            - '~2.dll'
            - '~2.exe'
            - '~2.hta'
            - '~2.js'
            - '~2.msi'
            - '~2.ps1'
            - '~2.tmp'
            - '~2.vbe'
            - '~2.vbs'
    filter_main_generic_parent:
        ParentImage: 'C:\Windows\explorer.exe'
    filter_optional_webex:
        ParentImage|endswith: '\WebEx\WebexHost.exe'
    filter_optional_thor:
        ParentImage|endswith: '\thor\thor64.exe'
    filter_optional_winzip:
        Image: 'C:\PROGRA~1\WinZip\WZPREL~1.EXE'
    filter_optional_vcred:
        Image|endswith: '\VCREDI~1.EXE'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Software Installers
level: medium

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