Converting a standard Windows executable (.exe) directly into shellcode is not as simple as copying its raw bytes. Standard executables rely on the Windows OS loader to handle complex tasks like resolving imports (DLLs), performing relocations, and setting up memory sections. Shellcode, by definition, must be position-independent code (PIC)—meaning it can run anywhere in memory without these external setup steps. Here is how you can effectively bridge that gap. Method 1: Use a PE-to-Shellcode Converter (Recommended)
Convert EXE to reflective DLL first, then to shellcode: convert exe to shellcode
void *exec = VirtualAlloc(0, sizeof(shellcode), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
memcpy(exec, shellcode, sizeof(shellcode));
((void(*)())exec)();
Further Reading & Tools
- Donut GitHub – https://github.com/TheWover/donut
- sRDI (Shellcode Reflective DLL Injection) – Similar concept for DLLs.
- PE2SH (PE to Shellcode) – An older, simpler script.
- Mona.py – For generating position-independent egg hunters.