VMMap Unsigned Dbghelp.DLL Potential Sideloading


Description

Detects potential DLL sideloading of an unsigned dbghelp.dll by the Sysinternals VMMap.

Query · sigma

selection:
  ImageLoaded|contains: C:\Debuggers\dbghelp.dll
  Image|endswith:
  - \vmmap.exe
  - \vmmap64.exe
filter_main_signed:
  Signed: 'true'
condition: selection and not 1 of filter_main_*

Known false positives

  • Unknown
Raw source VMMap Unsigned Dbghelp.DLL Potential Sideloading · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified.
title: VMMap Unsigned Dbghelp.DLL Potential Sideloading
id: 273a8dd8-3742-4302-bcc7-7df5a80fe425
related:
    - id: 98ffaed4-aec2-4e04-9b07-31492fe68b3d
      type: similar
status: test
description: Detects potential DLL sideloading of an unsigned dbghelp.dll by the Sysinternals VMMap.
references:
    - https://techcommunity.microsoft.com/t5/sysinternals-blog/zoomit-v7-1-procdump-2-0-for-linux-process-explorer-v17-05/ba-p/3884766
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-07-28
modified: 2023-09-05
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|contains: 'C:\Debuggers\dbghelp.dll'
        Image|endswith:
            - '\vmmap.exe'
            - '\vmmap64.exe'
    filter_main_signed:
        Signed: 'true'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

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