#include <stdio.h>
#include <Windows.h>

void Overwrite(DWORD Target, DWORD New)
{
    DWORD old;
    VirtualProtect(Target, 7, PAGE_EXECUTE_READWRITE, &old);

    unsigned char* oldfunc = (unsigned char*)Target;
    oldfunc[0] = 0xb8;
    oldfunc[1] = New & 0xff;
    oldfunc[2] = (New >> 8) & 0xff;
    oldfunc[3] = (New >> 16) & 0xff;
    oldfunc[4] = (New >> 24) & 0xff;
    oldfunc[5] = 0xff;
    oldfunc[6] = 0xe0;
}

void main() {

    puts("Is deadbeef?");
    Overwrite(&puts, 0xDEADBEEF);
    puts("YES!");
}