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REpsych

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REpsych

: Psychological Warfare in Reverse Engineering

github.com/xoreaxeaxeax/repsych // domas // @xoreaxeaxeax

Overview

The REpsych toolset is a proof-of-concept illustrating the generation of images<br>through a program's control flow<br>graph (CFG).

A typical function's CFG<br>A REpsych generated CFG

There is no specific point to the project (other than to show that it can be<br>done), but possible (non-serious) applications are outlined in the DEF CON<br>presentation.

The program works reliably with all tested versions of the IDA Pro reverse<br>engineering tool, and semi-reliably with other CFG viewers (Hopper, BinNavi,<br>radare2, etc).

Usage

The toolset translates source images into functioning programs, such that the<br>program's control flow graph generates the source image.

To generate a new program from an image:

Save the image in the gfx/ folder as a 24 BPP bitmap.

Run "make image" in the root directory of the project, where "image" is the<br>name of your image, without the extension.

Two functioning programs will be created: repsych_v1 and repsych_v2. Each uses<br>a different strategy for ensuring the CFG renderer correctly places the CFG<br>nodes.

Tips

The tool will create a basic block (CFG node) for each pixel of the source<br>image; as such, you should try to use small source images (not larger than<br>100x100), and you may need to increase the number of allowed nodes in your CFG<br>viewer.

When using an image of text as input to the tool, first convert the image to a<br>2 BPP black and white bitmap first, then to a 24 BPP bitmap; this will remove<br>non black and white colors, and give the best results in the control flow graph.

Examples

References

The technique is outlined in detail in the DEF CON<br>presentation.

Slides from the presentation are provided<br>here.

Author

REpsych is a proof-of-concept from Christopher Domas<br>(@xoreaxeaxeax).

About<br>Psychological warfare in reverse engineering<br>Resources<br>Readme<br>BSD-3-Clause license<br>Activity<br>Stars<br>1.1k stars<br>Watchers<br>28 watching<br>Forks<br>71 forks<br>Report repository

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