DeSteam
DeSteam is a SteamDrm automated unpacker. Currently it supports only one version of the SteamDrm.
GPL-3.0 License
DeSteam
DeSteam purpose is to unpack files packed with SteamDrm. It currently works on only one of the SteamDrm versions, tested only on three games as of now. I created this project for the sole purpose of learning about DRMs and getting better at reverse engineering.
I do not take responsibility for the improper use of the software, you should only use this on games/applications that you legally own and you should not distribute unpacked files. This software was made for educational purposes ONLY.
Installation
Download the last release from the Releases page, then just run the .exe according to the Usage section. Alternately you can compile the C# code yourself, it is originally compiled in Visual Studio 2022.
Usage
In a terminal you have to execute the program with this argument:
./DeSteam.exe [path_to_file_to_unpack]
Optional arguments are:
-v, --verbose Shows additional info when executing. (Default: false)
-o, --output Specify unpacked file name. (Default: [original_name].unpacked.exe)
Dependencies
Currently DeSteam depends on:
- Unicorn emulator, to emulate a part of the unpacking code extracted from the SteamDrm.
- unicorn-net, a .NET wrapper of the unicorn emulator.
- commandlineparser, a library allowing easy management of arguments passed to the program.
What exactly is the Steam DRM?
Quoting from Steam Steamworks documentation:
The Steam DRM wrapper is an important part of Steam platform because it verifies game ownership and ensures that Steamworks features work properly by launching Steam before launching the game.
The Steam DRM wrapper by itself is not an anti-piracy solution. The Steam DRM wrapper protects against extremely casual piracy (i.e. copying all game files to another computer) and has some obfuscation, but it is easily removed by a motivated attacker.
We suggest enhancing the value of legitimate copies of your game by using Steamworks features which won't work on non-legitimate copies (e.g. online multiplayer, achievements, leaderboards, trading cards, etc.).