REpsych Toolset Generates Images from Program Control Flow Graphs

Introducing REpsych

Christopher Domas, known as @xoreaxeaxeax, has released REpsych, a proof-of-concept toolset. This tool demonstrates the ability to generate images directly through a program's control flow graph (CFG). The project's primary purpose is to illustrate that such a technique is feasible.

How it Works

REpsych functions by translating source images into executable programs. When these generated programs are viewed in a CFG viewer, their control flow graph visually reconstructs the original source image. The tool creates a basic block (CFG node) for each pixel of the input image, necessitating the use of small source images, ideally not exceeding 100x100 pixels.

Compatibility and Usage

The toolset operates reliably with all tested versions of the IDA Pro reverse engineering tool. It also shows semi-reliable functionality with other CFG viewers such as Hopper, BinNavi, and radare2. Users can generate new programs from images by saving a 24 BPP bitmap in the gfx/ folder and running a 'make' command. For text images, a preliminary conversion to a 2 BPP black and white bitmap is recommended for optimal results.

Potential Implications

While the project is presented as a proof-of-concept without serious applications, it highlights an unusual method of manipulating program visualization. The technique, detailed in a DEF CON presentation, could be explored for niche applications within reverse engineering or code obfuscation, though no specific serious uses are outlined by the creator.