https://github.com/barrettotte/not-a-rat

A joke "virus" using OpenGL and a little MASM
https://github.com/barrettotte/not-a-rat

masm32 opengl virus-joke

Last synced: 13 days ago
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A joke "virus" using OpenGL and a little MASM

• Host: GitHub
• URL: https://github.com/barrettotte/not-a-rat
• Owner: barrettotte
• License: mit
• Created: 2024-10-20T17:57:31.000Z (23 days ago)
• Default Branch: master
• Last Pushed: 2024-10-23T22:41:46.000Z (20 days ago)
• Last Synced: 2024-10-24T11:23:51.332Z (20 days ago)
• Topics: masm32, opengl, virus-joke
• Language: C++
• Homepage: https://barrettotte.github.io/not-a-rat/
• Size: 16 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# not-a-rat

A joke "virus" using OpenGL and a little MASM.

This was an excuse to learn the basics of parsing an OBJ file and rendering a 3D model in OpenGL.

I also wanted a little refresh on MASM which is why the installer is in assembly.

This is really just a toy and obviously gets hit by Microsoft Smart Screen immediately 

and is not in any way stealthy or practical.

This is making me very interested in AV bypass though, so I'll probably do something related to this in the future.

## Summary

- User runs installer, `Discord-Nitro-Free-2024-v2.7.exe` (this will pop Microsoft Smart Screen)

- Prompts user if they trust the program and want to install

  - Clicking "No", just continues to display prompt

- After clicking "Yes", installer downloads "second stage" named `Rat.exe` and places it on Desktop

- Message box notifies that install was successful and `Rat.exe` is executed

- `Rat.exe` displays multiple windows of rotating 3D model of a rat from Halo 3

Get it? Rat as in RAT (Remote Access Trojan)...




[![demo of not-a-rat](docs/thumbnail.png)](https://barrettotte.github.io/not-a-rat/)

## Asset Prep

- Downloaded [Halo3 Rat Model by Bylan](https://sketchfab.com/3d-models/halo-3-the-god-rat-e1853357d88545c9ab33e069641bc65c)

- Converted `rat.fbx` to `rat.obj` using Blender

- Converted `rat.png` to `rat.bmp` using Paint.NET

  - set to 4-bit bit depth, Octree, dither 0

- Replaced `rat.png` with `rat.bmp` in `rat.mtl`

## Limitations

- I limited Windows Defender checks by using `InternetOpen`, `InternetOpenUrl`, and `CreateProcess` in `Installer/src/main.asm`.

  But, Microsoft Smart Screen is still popped due to being unsigned

- Materials are restricted to only diffuse maps

- Textures have to be 4-bit BMP format; I was trying to minimize executable size

- I probably have some memory leaks, I'm not a C++ expert...

## Development

- Visual Studio 2022

- [MASM32 SDK](https://masm32.com/) (installed on same drive as repo)

- [GLFW 3.4](https://www.glfw.org/download.html)

- [Glad](https://glad.dav1d.de/)

  - Language=C/C++, Specification=OpenGL, GL=3.3, Profile=Core

  - Generate a loader enabled

File download in installer can be tested locally using - `python3 -m http.server`

## References

- https://learn.microsoft.com/en-us/windows/win32/api/

- https://learn.microsoft.com/en-us/cpp/assembler/masm/microsoft-macro-assembler-reference

- [Halo3 Rat Model by Bylan](https://sketchfab.com/3d-models/halo-3-the-god-rat-e1853357d88545c9ab33e069641bc65c)

- https://learnopengl.com/