🐨 Koaloader 📥

A collection of DLLs that use search order hijacking to automatically inject specified DLLs.

🔗 Links

🚀 Usage

Simply place one of the proxy dlls where a process is attempting to load it and set up the config file to load the DLLs that you wish to inject.

📚 Supported proxies

Note	➕ If you wish to see another proxy DLL supported, feel free to request it in the official forum topic, specifying the DLL name and describing its use case.

Click to see all proxies

✓ audioses.dll
✓ d3d9.dll
✓ d3d10.dll
✓ d3d11.dll
✓ dinput8.dll
✓ dwmapi.dll
✓ dxgi.dll
✓ glu32.dll
✓ hid.dll
✓ iphlpapi.dll
✓ msasn1.dll
✓ msimg32.dll
✓ mswsock.dll
✓ opengl32.dll
✓ profapi.dll
✓ propsys.dll
✓ textshaping.dll
✓ version.dll
✓ winhttp.dll
✓ wldp.dll
✓ winmm.dll
✓ xinput9_1_0.dll

⚙ Configuration

Koaloader comes with a configuration file Koaloader.config.json, which will be the same for any proxy dll. The config file conforms to the standard JSON format. The description of each available option is presented below:

logging

Enables or disables logging into a Koaloader.log file. Possible values: true, false (default).

enabled

Entirely enables or disables Koaloader injection. Can be used to quickly disable Koaloader without modifying files on disk. Possible values: true (default), false.

auto_load

Enables or disables automatic loading of well-known DLLs. This can be used to automatically inject DLLs without Koaloader.config.json config file. When enabled, Koaloader will first try to find a well-known DLL in parent directories of the search directories^[1]. If it failed to do so, it will recursively go through all files in search directories^[1] directory and search for files with well-known file names. Default: true. A list of well-known filenames (Names ending in 32 and 64 are loaded only by 32-bit and 64-bit binaries respectively):

Unlocker.dll, Unlocker32.dll, Unlocker64.dll
Lyptus.dll, Lyptus32.dll, Lyptus64.dll
ScreamAPI.dll,ScreamAPI32.dll,ScreamAPI64.dll
SmokeAPI.dll,SmokeAPI32.dll,SmokeAPI64.dll
UplayR1Unlocker.dll, UplayR1Unlocker32.dll, UplayR1Unlocker64.dll
UplayR2Unlocker.dll, UplayR2Unlocker32.dll, UplayR2Unlocker64.dll

targets

A list of strings that specify targeted executables. This can be used to prevent unintended loading by irrelevant executables. Koaloader will inject modules if, and only if:

The list of targets is empty, or
The list of targets includes an executable that has loaded Koaloader.

modules

A list of objects that describe modules that will be loaded in the order they were defined. Each object has the following properties:

`path`	A string that specifies absolute or relative path to a DLL. The relative path is with respect to the working directory, which may be different from the executable directory.
`required`	A boolean that marks the module as required for loading. This can be used to specify behaviour when Koaloader fails to load a given module. Failure to load required modules will result in a crash with message box, whereas in not required modules Koaloader will simply print the error in the log file. Default: `true`.

You can refer to the following config as an example.

Here we have defined 2 DLLs to load:

target.dll - via a path that is relative to the current working directory of the executable
eucalyptus.dll - via an absolute path.

{
  "logging": true,
  "enabled": true,
  "auto_load": false,
  "targets": [
    "program32.exe",
    "program64.exe"
  ],
  "modules": [
    {
      "path": "target.dll",
      "required": true
    },
    {
      "path": "C:/users/acidicoala/eucalyptus.dll",
      "required": false
    }
  ]
}

🏗️ Building from source

🚦 Requirements

CMake v3.24 (Make sure that cmake is available from powershell)
Visual Studio 2022^[2].
Tested on Windows 11 SDK (10.0.22621.0)^[2].

👨‍💻 Commands

Clone the project with its submodules:

git clone --recurse-submodules https://github.com/acidicoala/Koaloader.git

Run the build script with desired parameters:

./build.ps1 $Arch $Config $Proxy

where

`$Arch`	Program architecture. Valid values: `32` `64`
`$Config`	Build configuration. Valid values: `Debug` `Release` `RelWithDebInfo`
`$Proxy`	Proxy DLL to build. Any DLL from `C:/Windows/System32` that includes only named exports is valid.

Example:

./build.ps1 64 Release d3d11

The final DLL will be located at build\$Arch\$Proxy\$Config

Potential improvements

❏ DLLs with unnamed exports (by ordinal)
❏ DLLs that are missing from System32 directory

Miscellaneous notes

Version is defined in CMakeLists.txt
CMake project likely needs to be reloaded after changing files in the res directory.
GitHub actions will build the project on every push to master, but will prepare a draft release only if the last commit was tagged.
Proxy DLLs for CI releases need to be defined in ci.yml

👋 Acknowledgements

SmokeAPI makes use of the following open source projects:

📄 License

This software is licensed under the Unlicense, terms of which are available in UNLICENSE.txt

1. Search directories include the directory where Koaloader DLL is located as well as the working directory of the target process.

2. Older versions may be supported as well.

acidicoala/Koaloader

acidicoala

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