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Copy pathHideModule.cpp
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267 lines (233 loc) · 9.41 KB
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// HideModule.cpp : Defines the exported functions for the DLL application.
//
#include "HideModule.h"
#include <stdio.h>
#include <stdarg.h>
#include <tchar.h>
#include <tlhelp32.h>
#include <psapi.h>
#include <winternl.h>
#pragma comment(lib, "Psapi.lib")
typedef
LPVOID WINAPI VIRTUALALLOC(
_In_opt_ LPVOID lpAddress,
_In_ SIZE_T dwSize,
_In_ DWORD flAllocationType,
_In_ DWORD flProtect
);
typedef
void *MEMCPY(
void *dest,
const void *src,
size_t count
);
typedef
bool UNLOADMODULE(
HMODULE hModule,
LPVOID lpNewBaseAddr,
ULONG_PTR SizeOfImage
);
typedef
NTSTATUS WINAPI NTQUERYINFORMATIONPROCESS(
_In_ HANDLE ProcessHandle,
_In_ PROCESSINFOCLASS ProcessInformationClass,
_Out_ PVOID ProcessInformation,
_In_ ULONG ProcessInformationLength,
_Out_opt_ PULONG ReturnLength
);
typedef struct _LDR_MODULE
{
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID BaseAddress;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STRING FullDllName;
UNICODE_STRING BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_MODULE, *PLDR_MODULE;
void Print(const LPTSTR fmt, ...) {
va_list args;
va_start(args, fmt);
int len = _vsctprintf(fmt, args);
LPTSTR buffer = (LPTSTR)new TCHAR[len + 1];
_vsntprintf_s(buffer, len + 1, _TRUNCATE, fmt, args);
va_end(args);
OutputDebugString(buffer);
delete []buffer;
}
//bool IncModuleRefCount(HMODULE hModule) {
// HANDLE hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, 0);
// if (hSnapShot == INVALID_HANDLE_VALUE) {
// DbgPrint((TEXT("CreateToolhelp32Snapshot failed, Error: %d\n"), GetLastError()));
// return false;
// }
//
// MODULEENTRY32 ModuleEntry = { 0 };
// ModuleEntry.dwSize = sizeof(MODULEENTRY32);
// if (!Module32First(hSnapShot, &ModuleEntry)) {
// DbgPrint((TEXT("Module32First failed, Error: %d\n"), GetLastError()));
// CloseHandle(hSnapShot);
// return false;
// }
//
// do {
// if (ModuleEntry.hModule != hModule)
// LoadLibrary(ModuleEntry.szModule);
// } while (Module32Next(hSnapShot, &ModuleEntry));
//
// CloseHandle(hSnapShot);
// return true;
//}
bool SetThreadsState(bool IsResume) {
HANDLE hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if (hSnapShot == INVALID_HANDLE_VALUE) {
DbgPrint((TEXT("CreateToolhelp32Snapshot failed, Error: %d\n"), GetLastError()));
return false;
}
THREADENTRY32 ThreadEntry = { 0 };
ThreadEntry.dwSize = sizeof(ThreadEntry);
DWORD ThreadId = GetCurrentThreadId();
DWORD ProcessId = GetCurrentProcessId();
if (!Thread32First(hSnapShot, &ThreadEntry)) {
DbgPrint((TEXT("Thread32First failed, Error: %d\n"), GetLastError()));
CloseHandle(hSnapShot);
return false;
}
do {
if (ProcessId == ThreadEntry.th32OwnerProcessID && ThreadId != ThreadEntry.th32ThreadID) {
HANDLE hThread = OpenThread(THREAD_SUSPEND_RESUME, FALSE, ThreadEntry.th32ThreadID);
if (hThread != NULL) {
if (IsResume) {
ResumeThread(hThread);
} else {
SuspendThread(hThread);
}
CloseHandle(hThread);
}
}
} while (Thread32Next(hSnapShot, &ThreadEntry));
CloseHandle(hSnapShot);
return true;
}
void PrintModulesInformation() {
NTQUERYINFORMATIONPROCESS *pfnNtQueryInformationProcess =
(NTQUERYINFORMATIONPROCESS *)GetProcAddress(GetModuleHandle(TEXT("ntdll.dll")), "NtQueryInformationProcess");
if (pfnNtQueryInformationProcess != NULL) {
PROCESS_BASIC_INFORMATION PBI = { 0 };
DWORD ReturnLength = 0;
if (NT_SUCCESS(pfnNtQueryInformationProcess(GetCurrentProcess(), ProcessBasicInformation, &PBI, sizeof(PBI), &ReturnLength))) {
PLDR_MODULE LdrModule = NULL;
PLIST_ENTRY Head = PBI.PebBaseAddress->Ldr->InMemoryOrderModuleList.Flink;
PLIST_ENTRY Current = Head;
do {
LdrModule = (PLDR_MODULE)CONTAINING_RECORD(Current, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
Print(TEXT("Name: %s, BaseAddress: %p, LoadCount: %d\n"), LdrModule->BaseDllName.Buffer,
LdrModule->BaseAddress, LdrModule->LoadCount);
Current = Current->Flink;
} while (Current != Head);
}
}
}
void AdjustModuleReferenceCount(HMODULE hModule) {
NTQUERYINFORMATIONPROCESS *pfnNtQueryInformationProcess =
(NTQUERYINFORMATIONPROCESS *)GetProcAddress(GetModuleHandle(TEXT("ntdll.dll")), "NtQueryInformationProcess");
if (pfnNtQueryInformationProcess != NULL) {
PROCESS_BASIC_INFORMATION PBI = { 0 };
DWORD ReturnLength = 0;
if (NT_SUCCESS(pfnNtQueryInformationProcess(GetCurrentProcess(), ProcessBasicInformation, &PBI, sizeof(PBI), &ReturnLength))) {
PLDR_MODULE LdrModule = NULL;
PLIST_ENTRY Head = PBI.PebBaseAddress->Ldr->InMemoryOrderModuleList.Flink;
PLIST_ENTRY Current = Head;
do {
LdrModule = (PLDR_MODULE)CONTAINING_RECORD(Current, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
// The LoadCount of DLLs that are static linked is -1, that kind of DLLs can't be freed
// by FreeLibrary. So I modify that LoadCount to 1 in case that this DLL is static linked.
if (LdrModule->BaseAddress == hModule) {
// Add the reference count of DLLs that this module relies on
LoadLibraryW(LdrModule->BaseDllName.Buffer);
LdrModule->LoadCount = 1;
break;
}
Current = Current->Flink;
} while (Current != Head);
}
}
}
bool UnloadModule(HMODULE hModule, LPVOID lpNewBaseAddr, ULONG_PTR SizeOfImage)
{
LPVOID lpBaseOfDll = (LPVOID)hModule;
MEMCPY *pfnMemCpy = (MEMCPY *)GetProcAddress(GetModuleHandle(TEXT("ntdll.dll")), "memcpy");
VIRTUALALLOC *pfnVirtualAlloc = (VIRTUALALLOC *)GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "VirtualAlloc");
bool ret = false;
if (!FreeLibrary(hModule)) {
DbgPrint((TEXT("FreeLibrary for the module failed, Error: %d\n"), GetLastError()));
}
// After FreeLibrary, we can't use any functions whose addresses are not retrieved before.
// And the strings are invalid also.
LPVOID OriBaseAddr = pfnVirtualAlloc(lpBaseOfDll, SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (OriBaseAddr == NULL) {
// DbgPrint((TEXT("pfnVirtualAlloc for OriBaseAddr failed, Error: %d\n"), GetLastError()));
} else if (OriBaseAddr != lpBaseOfDll) {
// DbgPrint((TEXT("OriBaseAddr is not equal to lpBaseOfDll\n")));
} else {
pfnMemCpy(OriBaseAddr, lpNewBaseAddr, SizeOfImage);
ret = true;
}
return ret;
}
void HideModule(HMODULE hModule, bool DeleteAfter) {
MODULEINFO ModuleInfo = { 0 };
if (!GetModuleInformation(GetCurrentProcess(), hModule, &ModuleInfo, sizeof(ModuleInfo))) {
DbgPrint((TEXT("GetModuleInformation failed, Error: %d\n"), GetLastError()));
return;
}
LPVOID lpNewBaseAddr = VirtualAlloc(NULL, ModuleInfo.SizeOfImage,
MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (lpNewBaseAddr == NULL) {
DbgPrint((TEXT("VirtualAlloc for lpNewBaseAddr failed, Error: %d\n"), GetLastError()));
return;
}
memcpy(lpNewBaseAddr, ModuleInfo.lpBaseOfDll, ModuleInfo.SizeOfImage);
UNLOADMODULE *pfnUnloadModule = (UNLOADMODULE *)((ULONG_PTR)UnloadModule
- (ULONG_PTR)ModuleInfo.lpBaseOfDll + (ULONG_PTR)lpNewBaseAddr);
Print(TEXT("\n----------------------------------------------------------------------------\n"));
Print(TEXT("Check the modules before adjusting the reference count of the loaded modules\n"));
PrintModulesInformation();
AdjustModuleReferenceCount(hModule);
Print(TEXT("\n---------------------------------------------------------------------------\n"));
Print(TEXT("Check the modules after adjusting the reference count of the loaded modules\n"));
PrintModulesInformation();
TCHAR FileName[MAX_PATH] = { 0 };
bool HasFileName = false;
if (DeleteAfter) {
if (!GetModuleFileName(hModule, FileName, _countof(FileName))) {
DbgPrint((TEXT("GetModuleFileName failed, Error: %d\n"), GetLastError()));
} else {
HasFileName = true;
}
}
SetThreadsState(false);
// Jump to the new space, and free the original dll in the new space
if (!pfnUnloadModule(hModule, lpNewBaseAddr, ModuleInfo.SizeOfImage)) {
DbgPrint((TEXT("UnloadModule failed, Error: %d\n"), GetLastError()));
}
// Jump back to the original space
SetThreadsState(true);
Print(TEXT("\n---------------------------------------------\n"));
Print(TEXT("Check the modules after FreeLibrary is called\n"));
PrintModulesInformation();
if (!VirtualFree(lpNewBaseAddr, 0, MEM_DECOMMIT)) {
DbgPrint((TEXT("VirtualFree for lpNewBaseAddr failed, Error: %d\n"), GetLastError()));
}
if (HasFileName) {
if (!DeleteFile(FileName)) {
DbgPrint((TEXT("DeleteFile failed, Error: %d\n"), GetLastError()));
}
}
}
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