Hacking Tools

DLL Universal Patcher – A Comprehensive Guide To Advanced Binary Patching

DLL Universal Patcher is a flexible and convenient code patcher that doesn’t touch the files on disk.

It can be used for replacing any tasks that you’d otherwise achieve with on-disk patching, such as fixing old software on modern machines, or fixing bugs in others’ software.

In addition, due to more control over when the patching happens, it is possible to patch packed executables.

How To Use

  1. Pick a suitable dll to proxy, like version.dll
  2. Use dll-proxy-generator.exe --import-dll "dll_universal_patcher.dll" --import "dummy" "C:\Windows\System32\version.dll" to generate a suitable proxy dll
  3. Write up your patches into patches.json (more on this later)
  4. Place the generated dll, dll_universal_patcher.dll, and patches.json in target directory to perform dll hijacking

How To Use (Advanced)

  1. Pick a suitable dll to proxy, like version.dll
  2. Use dll-proxy-generator.exe --import-dll "dll_universal_patcher.dll" --import "dummy" "C:\Windows\System32\version.dll" to generate a suitable proxy dll
  3. Write up your patches into patches.json (more on this later)
  4. Use a tool like CFF Explorer to add the config as a RCDATA resource with ID 1 and neutral language to dll_universal_patcher.dll
  5. Place the generated dll and dll_universal_patcher.dll in target directory to perform dll hijacking

patches.json

Example:

[
    {
        "modules": [ "winver.exe", "{exe}" ],
        "pattern": "01 02 03 04 05 ? 06 ?? 07",
        "replacement": "90 90 90 90 C3",
        "min_matches": 1,
        "max_matches": 3,
        "on_initialize": false,
        "on_process_initialized": true,
        "on_before_dllmain": false,
        "is_code": true,
        "allowed_to_fail": false,
        "multishot": false
    }
]

For more info on the options, check out the schema

Varshini

Varshini is a Cyber Security expert in Threat Analysis, Vulnerability Assessment, and Research. Passionate about staying ahead of emerging Threats and Technologies.

Recent Posts

Understanding the Model Context Protocol (MCP) and How It Works

Introduction to the Model Context Protocol (MCP) The Model Context Protocol (MCP) is an open…

20 hours ago

The file Command – Quickly Identify File Contents in Linux

While file extensions in Linux are optional and often misleading, the file command helps decode what a…

1 day ago

How to Use the touch Command in Linux

The touch command is one of the quickest ways to create new empty files or update timestamps…

1 day ago

How to Search Files and Folders in Linux Using the find Command

Handling large numbers of files is routine for Linux users, and that’s where the find command shines.…

1 day ago

How to Move and Rename Files in Linux with the mv Command

Managing files and directories is foundational for Linux workflows, and the mv (“move”) command makes it easy…

1 day ago

How to Create Directories in Linux with the mkdir Command

Creating directories is one of the earliest skills you'll use on a Linux system. The mkdir (make…

1 day ago