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152 | // ________________________________________________
//
// ShellLoad.c
//
// PURPOSE:
// Useful tool to test shellcodes.
// The program will load the shellcode from file and execute it into its own process memory.
// 3 different shellcode loading methods are provided as option.
//
// USAGE:
// Execute the program passing the shellcode file path as parameter.
// 2° parameter is optional and lets you define the preferred shellcode loading method:
// 1 = Inline ASM (Default)
// 2 = C Function
// 3 = CallWindowProc
//
//
// RELEASE NOTES:
// v1.0.0
// 27 Jul 2021
//
// AUTHOR:
// © BreakingSecurity.net
// https://BreakingSecurity.net
// ________________________________________________
#include <Windows.h>
#include <stdio.h>
// Shellcode Entrypoint function prototype
// TIP: We can edit this function to support different return types and parameters
typedef INT(*ShellEntry)();
#define METHOD_INLINEASM 1
#define METHOD_CFUNCTION 2
#define METHOD_CALLWINDOWPROC 3
int main(int argc, char *argv[])
{
int ret = 0;
int mtd = 1;
int err = 0;
DWORD fsize = 0;
printf("\n");
printf("-------------------------\n");
printf(" Shellcode Loader v1.0.0\n");
printf(" BreakingSecurity.net\n");
printf("-------------------------\n");
printf("\n");
if (argc < 2)
{
printf("USAGE MODE:\n");
printf("ShellLoad.exe path\n");
printf("ShellLoad.exe path method\n");
printf("\n");
printf("METHODS:\n");
printf("1 = Inline ASM (default)\n");
printf("2 = C Function\n");
printf("3 = CallWindowProc\n\n");
printf("EXAMPLE (default method): ShellLoad.exe \"C:\\shellcode.file\" \n");
printf("EXAMPLE (select method): ShellLoad.exe \"C:\\shellcode.file\" 1\n");
printf("------------------------\n");
printf("\n[-] ERROR: No parameter passed. Path to shellcode is required.\n\n");
_getch();
return 0;
}
if (argc > 2)
{
mtd = atoi(argv[2]);
}
printf("[+] Opening file: %s\n", argv[1]);
HANDLE hFile = CreateFileA(argv[1], GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
err = GetLastError();
printf("[-] ERROR: Unable to open file. Error %i\n", err);
return 0;
}
fsize = GetFileSize(hFile, NULL);
if (fsize == INVALID_FILE_SIZE)
{
err = GetLastError();
printf("[-] ERROR: GetFileSize error %i\n", err);
CloseHandle(hFile);
return 0;
}
printf("[+] File Size: %i bytes\n", fsize);
printf("[+] Allocating memory buffer...\n");
void* pShellcode = VirtualAlloc(NULL, fsize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (pShellcode == NULL)
{
err = GetLastError();
printf("[-] ERROR: VirtualAlloc error %i\n", err);
CloseHandle(hFile);
return 0;
}
printf("[+] Reading file...\n");
DWORD nBytesRead = 0;
ReadFile(hFile, pShellcode, fsize, &nBytesRead, NULL);
CloseHandle(hFile);
switch (mtd)
{
case METHOD_INLINEASM:
{
printf("[+] Executing shellcode (method: Inline ASM)\n");
__asm
{
call pShellcode // Execute shellcode entrypoint
mov ret, eax // Retrieve return value
}
break;
}
case METHOD_CFUNCTION:
{
printf("[+] Executing shellcode (method: C Function)\n");
ShellEntry fShellcode = (ShellEntry)pShellcode;
ret = fShellcode();
break;
}
case METHOD_CALLWINDOWPROC:
{
printf("[+] Executing shellcode (method: CallWindowProc)\n");
// TIP: we can use CallWindowProc parameters to pass arguments to our function
ret = CallWindowProcA((WNDPROC)pShellcode, 0, 0, 0, 0);
break;
}
}
printf("[+] Shellcode executed!\n");
_getch(); // Keep shellcode running
return ret;
}
|
