Extract Unity3D File: A Solution to Unlock Encrypted Content

Not all files are created equal, and Unity3D game developers have taken the extra step to encrypt their package files, making it challenging for us to extract the contents. In this article, we'll delve into the issue of extracting Unity3D files that have undergone a recent update, which now features an FBAU header instead of the traditional UnityFS header.

Background

Before diving into the solution, let's take a brief look at the problem. The package files in question can no longer be accessed using standard extraction tools due to the new encryption method employed by the game developers. This has left many users wondering if there are alternative means to extract the contents of these files or if this is considered custom encryption, making it unsupported.

The Challenge

I recently attempted to run Analysis on libil2cpp.so in Ghidra, a popular reverse engineering tool, but was met with a stuck progress bar at 0% for over three hours. This led me to halt the process and explore alternative solutions. After setting up everything as requested prior to Step 1, I realized that I had been looking at the wrong folders, missing the crucial libil2cpp.so file.

Example Files

To better understand the issue, I have included two example files via Google Drive links, which demonstrate the pre- and post-update states of Unity3D files. The hex image examples provided showcase the differences between the old and new encryption methods.

Frida Tutorial: Not Applicable in This Case

I initially tried to use the Decrypt unity 3d files with Frida tutorial, but it didn't seem applicable to my situation due to the lack of a libil2cpp.so file. Therefore, I'm seeking help on this forum to find an alternative solution that can unlock these encrypted files.

In conclusion, extracting Unity3D files has become more challenging with the recent update and introduction of the FBAU header. While standard extraction tools no longer work, there may be alternative methods available to access the contents of these files. I'm eager to hear from experts in this field and learn about any possible solutions or workarounds that can help us extract the content of these encrypted files.

Please feel free to provide additional information or tips on how to tackle this issue. If you have any experience with similar encryption methods, please share your insights. Together, we can find a way to unlock these files and gain access to their contents.

Extract unity3d file