A shellcode launcher written in assembly. Executes shellcode saved in a file. Its written in a pseudo-PIC style assembly, and saved as inline assembly for easy compiling.
Note, there are int 3 instructions in the launcher. This was written with the intent of debugging malware / malicious shellcode samples. If you want to include it in a project to actually launch and execute shellcode you might want to remove the int 3 intsructions.
./launcher.exe <shellcode_file>
int main(int argc, char **argv)
{
if (argc != 2) { return 1; }
FILE *fdShell = fopen(argv[1], "rb");
fseek(fdShell, 0, SEEK_END);
int length = ftell(fdShell);
rewind(fdShell);
void *sc = calloc(1, length);
fread(sc, length, 1, fdShell);
VirtualProtect(sc, length, 0x40, (unsigned long *)argv[0]);
__debugbreak();
(*(int(*)()) sc)();
__debugbreak();
return 0;
}