hacktricks/reversing/reversing-tools/blobrunner.md

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The only modified line from the original code is the line 10.
In order to compile it just create a C/C++ project in Visual Studio Code, copy and paste the code and build it.

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

#ifdef _WIN64
#include <WinBase.h>
#endif

// Define bool
#pragma warning(disable:4996)
#define true 1
#define false 0

const char* _version = "0.0.5";

const char* _banner = " __________.__        ___.  __________\n"
" \\______   \\  |   ____\\_ |__\\______   \\__ __  ____   ____   ___________     \n"
"  |    |  _/  |  /  _ \\| __ \\|       _/  |  \\/    \\ /    \\_/ __ \\_  __ \\  \n"
"  |    |   \\  |_(  <_> ) \\_\\ \\    |   \\  |  /   |  \\   |  \\  ___/|  | \\/ \n"
"  |______  /____/\\____/|___  /____|_  /____/|___|  /___|  /\\___  >__|          \n"
"         \\/                \\/       \\/           \\/     \\/     \\/    \n\n"
"                                                                     %s    \n\n";


void banner() {
	system("cls");
	printf(_banner, _version);
	return;
}

LPVOID process_file(char* inputfile_name, bool jit, int offset, bool debug) {
	LPVOID lpvBase;
	FILE* file;
	unsigned long fileLen;
	char* buffer;
	DWORD dummy;

	file = fopen(inputfile_name, "rb");

	if (!file) {
		printf(" [!] Error: Unable to open %s\n", inputfile_name);

		return (LPVOID)NULL;
	}

	printf(" [*] Reading file...\n");
	fseek(file, 0, SEEK_END);
	fileLen = ftell(file); //Get Length

	printf(" [*] File Size: 0x%04x\n", fileLen);
	fseek(file, 0, SEEK_SET); //Reset

	fileLen += 1;

	buffer = (char*)malloc(fileLen); //Create Buffer
	fread(buffer, fileLen, 1, file);
	fclose(file);

	printf(" [*] Allocating Memory...");

	lpvBase = VirtualAlloc(NULL, fileLen, 0x3000, 0x40);

	printf(".Allocated!\n");
	printf(" [*]   |-Base: 0x%08x\n", (int)(size_t)lpvBase);
	printf(" [*] Copying input data...\n");

	CopyMemory(lpvBase, buffer, fileLen);
	return lpvBase;
}

void execute(LPVOID base, int offset, bool nopause, bool jit, bool debug)
{
	LPVOID shell_entry;

#ifdef _WIN64
	DWORD   thread_id;
	HANDLE  thread_handle;
	const char msg[] = " [*] Navigate to the Thread Entry and set a breakpoint. Then press any key to resume the thread.\n";
#else
	const char msg[] = " [*] Navigate to the EP and set a breakpoint. Then press any key to jump to the shellcode.\n";
#endif

	shell_entry = (LPVOID)((UINT_PTR)base + offset);

#ifdef _WIN64

	printf(" [*] Creating Suspended Thread...\n");
	thread_handle = CreateThread(
		NULL,          // Attributes
		0,             // Stack size (Default)
		shell_entry,         // Thread EP
		NULL,          // Arguments
		0x4,           // Create Suspended
		&thread_id);   // Thread identifier

	if (thread_handle == NULL) {
		printf(" [!] Error Creating thread...");
		return;
	}
	printf(" [*] Created Thread: [%d]\n", thread_id);
	printf(" [*] Thread Entry: 0x%016x\n", (int)(size_t)shell_entry);

#endif

	if (nopause == false) {
		printf("%s", msg);
		getchar();
	}
	else
	{
		if (jit == true) {
			// Force an exception by making the first byte not executable.
			// This will cause
			DWORD oldp;

			printf(" [*] Removing EXECUTE access to trigger exception...\n");

			VirtualProtect(shell_entry, 1 , PAGE_READWRITE, &oldp);
		}
	}

#ifdef _WIN64
	printf(" [*] Resuming Thread..\n");
	ResumeThread(thread_handle);
#else
	printf(" [*] Entry: 0x%08x\n", (int)(size_t)shell_entry);
	printf(" [*] Jumping to shellcode\n");
	__asm jmp shell_entry;
#endif
}

void print_help() {
	printf(" [!] Error: No file!\n\n");
	printf("     Required args: <inputfile>\n\n");
	printf("     Optional Args:\n");
	printf("         --offset <offset> The offset to jump into.\n");
	printf("         --nopause         Don't pause before jumping to shellcode. Danger!!! \n");
	printf("         --jit             Forces an exception by removing the EXECUTE permission from the alloacted memory.\n");
	printf("         --debug           Verbose logging.\n");
	printf("         --version         Print version and exit.\n\n");
}

int main(int argc, char* argv[])
{
	LPVOID base;
	int i;
	int offset = 0;
	bool nopause = false;
	bool debug = false;
	bool jit = false;
	char* nptr;

	banner();

	if (argc < 2) {
		print_help();
		return -1;
	}

	printf(" [*] Using file: %s \n", argv[1]);

	for (i = 2; i < argc; i++) {
		if (strcmp(argv[i], "--offset") == 0) {
			printf(" [*] Parsing offset...\n");
			i = i + 1;
			if (strncmp(argv[i], "0x", 2) == 0) {
			    offset = strtol(argv[i], &nptr, 16);
            }
			else {
			    offset = strtol(argv[i], &nptr, 10);
			}
		}
		else if (strcmp(argv[i], "--nopause") == 0) {
			nopause = true;
		}
		else if (strcmp(argv[i], "--jit") == 0) {
			jit = true;
			nopause = true;
		}
		else if (strcmp(argv[i], "--debug") == 0) {
			debug = true;
		}
		else if (strcmp(argv[i], "--version") == 0) {
			printf("Version: %s", _version);
		}
		else {
			printf("[!] Warning: Unknown arg: %s\n", argv[i]);
		}
	}

	base = process_file(argv[1], jit, offset, debug);
	if (base == NULL) {
		printf(" [!] Exiting...");
		return -1;
	}
	printf(" [*] Using offset: 0x%08x\n", offset);
	execute(base, offset, nopause, jit, debug);
	printf("Pausing - Press any key to quit.\n");
	getchar();
	return 0;
}

Support HackTricks and get benefits!

• Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!

• Discover The PEASS Family, our collection of exclusive NFTs

• Get the official PEASS & HackTricks swag

• Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.

• Share your hacking tricks by submitting PRs to the hacktricks github repo.