wldfngrs / bytemod

Proof-of-concept re-emphasizing the technique of encrypting files by manipulating their individual bytes in some formulaic way.

bytemod

This repository contains a proof-of-concept program for encrypting files by manipulating their individual bytes in a formulaic way. The program takes in a directory and applies a hard-coded encryption algorithm to all files of a specified wildcard.

Installation

To install this program, clone this repository onto your local machine using the following command:

$ git clone https://github.com/wldfngrs/bytemod.git

Once you have cloned the repository, navigate to the project directory and run the following command:

$ make bytemod

This will compile the program and create an executable file in the bin directory.

Usage

To encrypt a file, run the following command:

$ ./bin/bytemod input_file/directory] --encrypt

To decrypt a file, run the following command:

$ ./bin/bytemod [input_file/directory] --decrypt

Testing

A test directory has been provided which contains sample input and output files for testing purposes. To test the program, run the following command:

$ ./bin/bytemod test/*.h -encrypt

and to decrypt,

$ ./bin/bytemod test/*.h -decrypt

To view the individual bytes before and after encryption, set the MAX_DEBUG_FLAG flag. Else, the commands produce no output.

Credits

This program was created by wldfngrs as part of a custom-malware build project.