The goal of this educational project was to encrypt the executable section of a target program (whose path was given through command line arguments), add a decryption payload to it, change its entry point to point to the decryption payload, then once ran, the decryption payload had to decrypt the encrypted section, print the string ....WOODY.... then give back the execution flow to the original program without altering its original behavior.
The original program given in the command line arguments remains untouched, a new file containing the Woodyfied program called woody.exe is created.
The project name is kinda confusing, I think it acts more like a crypter than a packer since compression isn't involved.
We were a team of two students working on this project, my mate did the ELF part (mandatory) and as a bonus I challenged myself to work on a PE (Windows) version.
Since Windows has more GUIs than CLIs, I decided to print the string in a message box.
I used Visual Studio in combination with MASM for x64 to achieve this project, which means I was only targeting 64-bit executables.
It is a very basic crypter, to store the decryption payload I create a new section, the encryption algorithm used is the XOR cipher, executables containing Thread Local Storage callbacks aren't supported (I wrote a check for it) and I also tried to disable Control Flow Guard by clearing the IMAGE_DLLCHARACTERISTICS_GUARD_CF flag if present.