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support older variant + auto unload on success or timeout

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This commit is contained in:
a 2024-10-05 20:04:15 +03:00
parent d40d306ccd
commit ed5b745e09
3 changed files with 600 additions and 412 deletions
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99
tools/steamclient_loader/win/extra_protection/dllmain.cpp
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@ -1,22 +1,77 @@
#include "pe_helpers/pe_helpers.hpp"
#include "extra_protection/stubdrm.hpp"
BOOL APIENTRY DllMain(
HMODULE hModule,
DWORD reason,
LPVOID lpReserved)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
stubdrm::patch();
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
stubdrm::restore();
break;
}
return TRUE;
}
#include "extra_protection/stubdrm.hpp"
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <condition_variable>
#include <mutex>
#include <chrono>
#include <thread>
static std::mutex dll_unload_mtx{};
static std::condition_variable dll_unload_cv{};
static bool unload_dll = false;
static HMODULE my_hModule = nullptr;
static HANDLE unload_thread_handle = INVALID_HANDLE_VALUE;
static void send_unload_signal()
{
{
std::lock_guard lock(dll_unload_mtx);
unload_dll = true;
}
dll_unload_cv.notify_one();
}
DWORD WINAPI self_unload(LPVOID lpParameter)
{
constexpr const auto UNLOAD_TIMEOUT =
#ifdef _DEBUG
std::chrono::minutes(5)
#else
std::chrono::seconds(5)
#endif
;
{
std::unique_lock lock(dll_unload_mtx);
dll_unload_cv.wait_for(lock, UNLOAD_TIMEOUT, [](){ return unload_dll; });
}
unload_thread_handle = INVALID_HANDLE_VALUE;
FreeLibraryAndExitThread(my_hModule, 0);
}
BOOL APIENTRY DllMain(
HMODULE hModule,
DWORD reason,
LPVOID lpReserved)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
if (!stubdrm::patch()) {
// https://learn.microsoft.com/en-us/windows/win32/dlls/dllmain
// "The system immediately calls your entry-point function with DLL_PROCESS_DETACH and unloads the DLL"
unload_dll = true;
return FALSE;
}
my_hModule = hModule;
stubdrm::set_cleanup_cb(send_unload_signal);
unload_thread_handle = CreateThread(nullptr, 0, self_unload, nullptr, 0, nullptr);
break;
case DLL_PROCESS_DETACH:
if (!unload_dll) { // not unloaded yet, just an early exit, or thread timed out
stubdrm::restore();
if (unload_thread_handle != INVALID_HANDLE_VALUE && unload_thread_handle != NULL) {
TerminateThread(unload_thread_handle, 0);
}
}
break;
}
return TRUE;
}

20
tools/steamclient_loader/win/extra_protection/extra_protection/stubdrm.hpp
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@ -1,11 +1,9 @@
#pragma once
#include <string>
#include <vector>
namespace stubdrm
{
bool patch();
bool restore();
}
#pragma once
namespace stubdrm
{
bool patch();
bool restore();
void set_cleanup_cb(void (*fn)());
}

893
tools/steamclient_loader/win/extra_protection/stubdrm.cpp
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@ -1,379 +1,514 @@
#include "pe_helpers/pe_helpers.hpp"
#include "common_helpers/common_helpers.hpp"
#include "extra_protection/stubdrm.hpp"
#include "detours/detours.h"
#include <tuple>
#include <mutex>
#include <intrin.h>
// MinGW doesn't implement _AddressOfReturnAddress(), throws linker error
// https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html
#if defined(__GNUC__) && (defined(__MINGW32__) || defined(__MINGW64__))
#define ADDR_OF_RET_ADDR() ((void*)((char*)__builtin_frame_address(0) + sizeof(void*)))
#else // regular windows
#define ADDR_OF_RET_ADDR() _AddressOfReturnAddress()
#endif
typedef struct SnrUnit {
std::string search_patt{};
std::string replace_patt{};
} SnrUnit_t;
typedef struct SnrDetails {
std::string detection_patt{};
bool change_mem_access = false;
std::vector<SnrUnit_t> snr_units{};
} SnrDetails_t;
// x64
#if defined(_WIN64)
static const std::vector<SnrDetails> snr_patts {
{
// detection_patt
"FF 94 24 ?? ?? ?? ?? 88 44 24 ?? 0F BE 44 24 ?? 83 ?? 30 74 ?? E9",
// change memory pages access to r/w/e
false,
// snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{
"E8 ?? ?? ?? ?? 84 C0 75 ?? B0 33 E9",
"B8 01 00 00 00 ?? ?? EB",
},
{
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C 35 0F 85",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9",
},
},
},
{
// detection_patt
"FF D? 44 0F B6 ?? 3C 30 0F 85",
// change memory pages access to r/w/e
false,
// snr_units
{
{
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C ?? 0F 85",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9 ?? ?? ?? ?? ?? ?? ?? ??",
},
},
},
};
#endif
// x32
#if !defined(_WIN64)
static const std::vector<SnrDetails> snr_patts {
{
// detection_patt
"FF 95 ?? ?? ?? ?? 88 45 ?? 0F BE 4D ?? 83 ?? 30 74 ?? E9",
// change memory pages access to r/w/e
false,
// snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{
"5? 5? E8 ?? ?? ?? ?? 83 C4 08 84 C0 75 ?? B0 33",
"?? ?? B8 01 00 00 00 ?? ?? ?? ?? ?? EB",
},
{
"E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C 35 75",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? 90 E9",
},
},
},
{
// detection_patt
"FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB",
// change memory pages access to r/w/e
true,
// snr_units
{
{
"F6 C? 02 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
"?? ?? ?? 90 E9 00 03",
},
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 00 03 00 00",
},
{
"F6 05 ?? ?? ?? ?? 02 89 ?? ?? 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 03 03",
},
},
},
{
// detection_patt
"FF D? 88 45 ?? 3C 30 0F 85 ?? ?? ?? ?? B8 4D 5A",
// change memory pages access to r/w/e
false,
// snr_units
{
{
"5? E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84",
"?? B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? 90 E9",
},
{
"5? E8 ?? ?? ?? ?? 8? ?? 83 C4 ?? 8? F? 30 74 ?? 8?",
"?? B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? EB",
},
},
},
};
#endif // _WIN64
static size_t current_snr_details = static_cast<size_t>(-1);
static std::recursive_mutex mtx_win32_api{};
static uint8_t *exe_addr_base = (uint8_t *)GetModuleHandleW(NULL);
static uint8_t *bind_addr_base = nullptr;
static uint8_t *bind_addr_end = nullptr;
static bool restore_win32_apis();
// stub v2 needs manual change for .text, section must have write access
static void change_mem_pages_access()
{
auto sections = pe_helpers::get_section_headers((HMODULE)exe_addr_base);
if (!sections.count) return;
for (size_t i = 0; i < sections.count; ++i) {
auto section = sections.ptr[i];
uint8_t *section_base_addr = exe_addr_base + section.VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{};
constexpr const static auto ANY_EXECUTE_RIGHT = PAGE_EXECUTE | PAGE_EXECUTE_READ | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY;
if (VirtualQuery((LPCVOID)section_base_addr, &mbi, sizeof(mbi)) && // function succeeded
(mbi.Protect & ANY_EXECUTE_RIGHT)) { // this page (not entire section) has execute rights
DWORD current_protection = 0;
auto res = VirtualProtect(section_base_addr, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &current_protection);
// if (!res) {
// MessageBoxA(
// nullptr,
// (std::string("Failed to change access of page '") + (char *)section.Name + "' ").c_str(),
// "Failed",
// MB_OK
// );
// }
}
}
}
static void patch_if_possible(void *ret_addr)
{
if (!ret_addr) return;
auto page_details = pe_helpers::get_mem_page_details(ret_addr);
if (!page_details.BaseAddress || page_details.AllocationProtect != PAGE_READWRITE) return;
bool anything_found = false;
for (const auto &snr_unit : snr_patts[current_snr_details].snr_units) {
auto mem = pe_helpers::search_memory(
(uint8_t *)page_details.BaseAddress,
page_details.RegionSize,
snr_unit.search_patt);
if (mem) {
anything_found = true;
auto size_until_match = (uint8_t *)mem - (uint8_t *)page_details.BaseAddress;
bool ok = pe_helpers::replace_memory(
(uint8_t *)mem,
page_details.RegionSize - size_until_match,
snr_unit.replace_patt,
GetCurrentProcess());
// if (!ok) return;
}
}
if (anything_found) {
restore_win32_apis();
if (snr_patts[current_snr_details].change_mem_access) change_mem_pages_access();
}
// MessageBoxA(NULL, ("ret addr = " + std::to_string((size_t)ret_addr)).c_str(), "Patched", MB_OK);
}
// https://learn.microsoft.com/en-us/cpp/intrinsics/addressofreturnaddress
static bool GetTickCount_hooked = false;
static decltype(GetTickCount) *actual_GetTickCount = GetTickCount;
__declspec(noinline)
static DWORD WINAPI GetTickCount_hook()
{
std::lock_guard lk(mtx_win32_api);
if (GetTickCount_hooked) { // american truck doesn't call GetModuleHandleA
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr);
}
return actual_GetTickCount();
}
static bool GetModuleHandleA_hooked = false;
static decltype(GetModuleHandleA) *actual_GetModuleHandleA = GetModuleHandleA;
__declspec(noinline)
static HMODULE WINAPI GetModuleHandleA_hook(
LPCSTR lpModuleName
)
{
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleA_hooked &&
lpModuleName &&
common_helpers::ends_with_i(lpModuleName, "ntdll.dll")) {
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr);
}
return actual_GetModuleHandleA(lpModuleName);
}
static bool GetModuleHandleExA_hooked = false;
static decltype(GetModuleHandleExA) *actual_GetModuleHandleExA = GetModuleHandleExA;
__declspec(noinline)
static BOOL WINAPI GetModuleHandleExA_hook(
DWORD dwFlags,
LPCSTR lpModuleName,
HMODULE *phModule
)
{
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleExA_hooked &&
(dwFlags == (GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT)) &&
((uint8_t *)lpModuleName >= bind_addr_base && (uint8_t *)lpModuleName < bind_addr_end)) {
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr);
}
return actual_GetModuleHandleExA(dwFlags, lpModuleName, phModule);
}
static bool redirect_win32_apis()
{
if (DetourTransactionBegin() != NO_ERROR) return false;
if (DetourUpdateThread(GetCurrentThread()) != NO_ERROR) return false;
if (DetourAttach((PVOID *)&actual_GetTickCount, (PVOID)GetTickCount_hook) != NO_ERROR) return false;
if (DetourAttach((PVOID *)&actual_GetModuleHandleA, (PVOID)GetModuleHandleA_hook) != NO_ERROR) return false;
if (DetourAttach((PVOID *)&actual_GetModuleHandleExA, (PVOID)GetModuleHandleExA_hook) != NO_ERROR) return false;
bool ret = DetourTransactionCommit() == NO_ERROR;
if (ret) {
GetTickCount_hooked = true;
GetModuleHandleA_hooked = true;
GetModuleHandleExA_hooked = true;
}
return ret;
}
static bool restore_win32_apis()
{
GetTickCount_hooked = false;
GetModuleHandleA_hooked = false;
GetModuleHandleExA_hooked = false;
if (DetourTransactionBegin() != NO_ERROR) return false;
if (DetourUpdateThread(GetCurrentThread()) != NO_ERROR) return false;
DetourDetach((PVOID *)&actual_GetTickCount, (PVOID)GetTickCount_hook);
DetourDetach((PVOID *)&actual_GetModuleHandleA, (PVOID)GetModuleHandleA_hook);
DetourDetach((PVOID *)&actual_GetModuleHandleExA, (PVOID)GetModuleHandleExA_hook);
return DetourTransactionCommit() == NO_ERROR;
}
static std::vector<uint8_t> get_pe_header_disk()
{
const std::string filepath = pe_helpers::get_current_exe_path() + pe_helpers::get_current_exe_name();
try {
std::ifstream file(std::filesystem::u8path(filepath), std::ios::in | std::ios::binary);
if (!file) return {};
// 2MB is enough
std::vector<uint8_t> data(2 * 1024 * 1024, 0);
file.read((char *)&data[0], data.size());
file.close();
return data;
} catch(...) { }
return {};
}
static bool calc_bind_section_boundaries()
{
auto bind_section = pe_helpers::get_section_header_with_name(((HMODULE)exe_addr_base), ".bind");
if (bind_section) {
bind_addr_base = exe_addr_base + bind_section->VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{};
if (VirtualQuery((LPVOID)bind_addr_base, &mbi, sizeof(mbi)) && mbi.RegionSize > 0) {
bind_addr_end = bind_addr_base + mbi.RegionSize;
} else if (bind_section->Misc.VirtualSize > 0) {
bind_addr_end = bind_addr_base + bind_section->Misc.VirtualSize;
} else {
return false;
}
return true;
}
// we don't *seem* to have .bind section *in memory*
// appid 1732190 changes the PIMAGE_OPTIONAL_HEADER->SizeOfHeaders to a size less than the actual,
// subtracting the size of the last section, i.e ".bind" section (original size = 0x600 >>> decreased to 0x400)
// that way whenever the .exe is loaded in memory, the Windows loader will ignore populating the PE header with the info
// of that section *in memory* since it is not taken into consideration, but the PE header *on disk* still contains the info
//
// also the PIMAGE_FILE_HEADER->NumberOfSections is kept intact, otherwise the PIMAGE_OPTIONAL_HEADER->AddressOfEntryPoint
// would be pointing at a non-existent section and the .exe won't work
auto disk_header = get_pe_header_disk();
if (disk_header.empty()) return false;
bind_section = pe_helpers::get_section_header_with_name(((HMODULE)&disk_header[0]), ".bind");
if (!bind_section) return false;
bind_addr_base = exe_addr_base + bind_section->VirtualAddress;
if (!bind_section->Misc.VirtualSize) return false;
bind_addr_end = bind_addr_base + bind_section->Misc.VirtualSize;
return true;
}
bool stubdrm::patch()
{
if (!calc_bind_section_boundaries()) return false;
auto addrOfEntry = exe_addr_base + pe_helpers::get_optional_header((HMODULE)exe_addr_base)->AddressOfEntryPoint;
if (addrOfEntry < bind_addr_base || addrOfEntry >= bind_addr_end) return false; // entry addr is not inside .bind
for (const auto &patt : snr_patts) {
auto mem = pe_helpers::search_memory(
bind_addr_base,
static_cast<size_t>(bind_addr_end - bind_addr_base),
patt.detection_patt);
if (mem) {
current_snr_details = &patt - &snr_patts[0];
return redirect_win32_apis();
}
}
return false;
}
bool stubdrm::restore()
{
return restore_win32_apis();
}
#include "extra_protection/stubdrm.hpp"
#include "pe_helpers/pe_helpers.hpp"
#include "common_helpers/common_helpers.hpp"
#include "detours/detours.h"
#include <string>
#include <vector>
#include <tuple>
#include <mutex>
#include <intrin.h>
// MinGW doesn't implement _AddressOfReturnAddress(), throws linker error
// https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html
// https://learn.microsoft.com/en-us/cpp/intrinsics/addressofreturnaddress
#if defined(__GNUC__) && (defined(__MINGW32__) || defined(__MINGW64__))
#define ADDR_OF_RET_ADDR() ((void*)((char*)__builtin_frame_address(0) + sizeof(void*)))
#else // regular windows
#define ADDR_OF_RET_ADDR() _AddressOfReturnAddress()
#endif
typedef struct _SnrUnit_t {
std::string search_patt{};
std::string replace_patt{};
} SnrUnit_t;
typedef struct _StubSnrDetails_t {
std::string stub_detection_patt{}; // inside the dynamically allocated stub
bool change_mem_access = false;
std::vector<SnrUnit_t> stub_snr_units{};
} StubSnrDetails_t;
typedef struct _BindSnrDetails_t {
std::string bind_detection_patt{}; // inside .bind
std::vector<StubSnrDetails_t> stub_details{};
} BindSnrDetails_t;
static const std::vector<BindSnrDetails_t> all_bind_details {
// x64
#if defined(_WIN64)
{
// bind_detection_patt
"FF 94 24 ?? ?? ?? ?? 88 44 24 ?? 0F BE 44 24 ?? 83 ?? 30 74 ?? E9", // appid 1684350
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{
"E8 ?? ?? ?? ?? 84 C0 75 ?? B0 3?",
"B8 01 00 00 00 ?? ?? EB",
},
{
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9",
},
},
},
},
},
{
// bind_detection_patt
"FF D? 44 0F B6 ?? 3C 30 0F 85", // appid: 537450 (rare, only found in this appid!)
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{
"E8 ?? ?? ?? ?? 84 C0 75 ?? B0 3?",
"B8 01 00 00 00 ?? ?? EB",
},
{
"E8 ?? ?? ?? ?? 44 0F B6 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? 90 E9",
},
},
},
},
},
#endif // x64
// x32
#if !defined(_WIN64)
{
// bind_detection_patt
"FF 95 ?? ?? ?? ?? 88 45 ?? 0F BE 4D ?? 83 ?? 30 74 ?? E9", // appid 588650
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
// patt 1 is a bunch of checks for registry + files validity (including custom DOS stub)
// patt 2 is again a bunch of checks + creates some interfaces via steamclient + calls getappownershipticket()
{
"5? 5? E8 ?? ?? ?? ?? 83 C4 08 84 C0 75",
"?? ?? B8 01 00 00 00 ?? ?? ?? ?? ?? EB",
},
{
"E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84 ?? ?? ?? ?? 3C 3?",
"B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? 90 E9",
},
},
},
},
},
{
// bind_detection_patt
"FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB", // appid 201790
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e
true, // appid 48000
// stub_snr_units
{
{
"F6 C? 02 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
"?? ?? ?? 90 E9 00 03",
},
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 00 03 00 00",
},
{ // appid 250180
"F6 05 ?? ?? ?? ?? 02 89 ?? ?? 0F 85 ?? ?? ?? ?? 5? FF ?? 6?",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 03 03",
},
},
},
},
},
{
// bind_detection_patt
"FF D? 88 45 ?? 3C 30 0F 85 ?? ?? ?? ?? B8 4D 5A",
// stub_details
{
{
// stub_detection_patt
"??",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
{
"5? E8 ?? ?? ?? ?? 83 C4 ?? 88 45 ?? 3C 30 0F 84",
"?? B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? 90 E9",
},
{
"5? E8 ?? ?? ?? ?? 8? ?? 83 C4 ?? 8? F? 30 74 ?? 8?",
"?? B8 30 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? EB",
},
},
},
},
},
{
// bind_detection_patt
"FF 95 ?? ?? ?? ?? 89 85 ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 8B ?? ?? ?? ?? ?? 89 ?? ?? ?? ?? ?? 83 A5 ?? ?? ?? ?? ?? EB", // appids: 31290, 94530, 37010
// stub_details
{
{ // appid 31290, 37010
// stub_detection_patt
"F6 05 ?? ?? ?? ?? 04 0F 85 ?? ?? ?? ?? A1 ?? ?? ?? ?? 89",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 57 02 00 00",
},
},
},
{ // 94530
// stub_detection_patt
"84 ?? ?? ?? ?? ?? 0F 85 ?? ?? ?? ?? A1 ?? ?? ?? ?? 89",
// change memory pages access to r/w/e
false,
// stub_snr_units
{
{
"F6 C? 02 89 ?? ?? ?? ?? ?? A3 ?? ?? ?? ?? 0F 85",
"?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 90 E9 2A 02 00 00",
},
{
"6A 04 5? 5? 8D",
"?? ?? ?? E9 BF 00 00 00",
},
},
},
},
},
#endif // x32
};
static size_t current_bind_idx = static_cast<size_t>(-1);
static uint8_t *exe_addr_base = (uint8_t *)GetModuleHandleW(nullptr);
static uint8_t *bind_addr_base = nullptr;
static uint8_t *bind_addr_end = nullptr;
// this mutex is used to halt/defer the execution of threads if they tried to use the hooked functions at the same time
// just in case
static std::recursive_mutex mtx_win32_api{};
// these flags are used as a fallback in case Detours lib failed to restore the hooks
static bool GetTickCount_hooked = false;
static bool GetModuleHandleA_hooked = false;
static bool GetModuleHandleExA_hooked = false;
void (*cleanup_cb)() = nullptr;
// old stub variant (found in appid 201790) needs manual change for .text section, it must have write access
static void change_mem_pages_access()
{
auto sections = pe_helpers::get_section_headers((HMODULE)exe_addr_base);
if (!sections.count) return;
constexpr const static unsigned ANY_EXECUTE_RIGHT = PAGE_EXECUTE | PAGE_EXECUTE_READ | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY;
for (size_t i = 0; i < sections.count; ++i) {
auto section = sections.ptr[i];
uint8_t *section_base_addr = exe_addr_base + section.VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{};
if (VirtualQuery((LPCVOID)section_base_addr, &mbi, sizeof(mbi)) && // function succeeded
(mbi.Protect & ANY_EXECUTE_RIGHT)) { // this page (not entire section) has execute rights
DWORD current_protection = 0;
auto res = VirtualProtect(section_base_addr, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &current_protection);
// if (!res) {
// MessageBoxA(
// nullptr,
// (std::string("Failed to change access of page '") + (char *)section.Name + "' ").c_str(),
// "Failed",
// MB_OK
// );
// }
}
}
}
static void call_cleanup_cb()
{
if (cleanup_cb) {
cleanup_cb();
}
}
static bool restore_win32_apis();
static void patch_if_possible(void *ret_addr)
{
if (!ret_addr) return;
auto page_details = pe_helpers::get_mem_page_details(ret_addr);
if (!page_details.BaseAddress || page_details.AllocationProtect != PAGE_READWRITE) return;
// find stub variant
const StubSnrDetails_t *current_stub = nullptr;
const auto &bind_details = all_bind_details[current_bind_idx];
for (const auto &stub_details : bind_details.stub_details) {
auto mem = pe_helpers::search_memory(
(uint8_t *)page_details.BaseAddress,
page_details.RegionSize,
stub_details.stub_detection_patt);
if (mem) {
current_stub = &stub_details;
break;
}
}
if (!current_stub) {
// we can't remove hooks here, the drm allocates many pages with read/write access to decrypt other parts
// and their code also gets here, if we restore hooks then we can't patch the actual stub page (which comes much later)
return;
}
// patch all snr units inside stub
bool anything_found = false;
for (const auto &snr_unit : current_stub->stub_snr_units) {
auto mem = pe_helpers::search_memory(
(uint8_t *)page_details.BaseAddress,
page_details.RegionSize,
snr_unit.search_patt);
if (mem) {
anything_found = true;
auto size_until_match = (uint8_t *)mem - (uint8_t *)page_details.BaseAddress;
bool ok = pe_helpers::replace_memory(
(uint8_t *)mem,
page_details.RegionSize - size_until_match,
snr_unit.replace_patt,
GetCurrentProcess());
// if (!ok) return;
}
}
if (anything_found) {
// MessageBoxA(NULL, ("ret addr = " + std::to_string((size_t)ret_addr)).c_str(), "Patched", MB_OK);
restore_win32_apis();
if (current_stub->change_mem_access) {
change_mem_pages_access();
}
call_cleanup_cb();
}
}
static decltype(GetTickCount) *actual_GetTickCount = GetTickCount;
__declspec(noinline)
static DWORD WINAPI GetTickCount_hook()
{
if (GetTickCount_hooked) { // unencrypted apps (like 270880 american truck) don't call GetModuleHandleA()
std::lock_guard lk(mtx_win32_api);
if (GetTickCount_hooked) { // if we win arbitration and hooks are still intact
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr);
}
}
return actual_GetTickCount();
}
static decltype(GetModuleHandleA) *actual_GetModuleHandleA = GetModuleHandleA;
__declspec(noinline)
static HMODULE WINAPI GetModuleHandleA_hook(
LPCSTR lpModuleName
)
{
if (GetModuleHandleA_hooked &&
lpModuleName && lpModuleName[0] &&
common_helpers::ends_with_i(lpModuleName, "ntdll.dll")) {
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleA_hooked) { // if we win arbitration and hooks are still intact
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr);
}
}
return actual_GetModuleHandleA(lpModuleName);
}
static decltype(GetModuleHandleExA) *actual_GetModuleHandleExA = GetModuleHandleExA;
__declspec(noinline)
static BOOL WINAPI GetModuleHandleExA_hook(
DWORD dwFlags,
LPCSTR lpModuleName,
HMODULE *phModule
)
{
constexpr const static unsigned HANDLE_FROM_ADDR = GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT;
if (GetModuleHandleExA_hooked &&
(dwFlags & HANDLE_FROM_ADDR) &&
((uint8_t *)lpModuleName >= bind_addr_base && (uint8_t *)lpModuleName < bind_addr_end)) {
std::lock_guard lk(mtx_win32_api);
if (GetModuleHandleExA_hooked) { // if we win arbitration and hooks are still intact
void* *ret_ptr = (void**)ADDR_OF_RET_ADDR();
patch_if_possible(*ret_ptr);
}
}
return actual_GetModuleHandleExA(dwFlags, lpModuleName, phModule);
}
static bool redirect_win32_apis()
{
if (DetourTransactionBegin() != NO_ERROR) return false;
if (DetourUpdateThread(GetCurrentThread()) != NO_ERROR) return false;
if (DetourAttach((PVOID *)&actual_GetTickCount, (PVOID)GetTickCount_hook) != NO_ERROR) return false;
if (DetourAttach((PVOID *)&actual_GetModuleHandleA, (PVOID)GetModuleHandleA_hook) != NO_ERROR) return false;
if (DetourAttach((PVOID *)&actual_GetModuleHandleExA, (PVOID)GetModuleHandleExA_hook) != NO_ERROR) return false;
bool ret = DetourTransactionCommit() == NO_ERROR;
if (ret) {
GetTickCount_hooked = true;
GetModuleHandleA_hooked = true;
GetModuleHandleExA_hooked = true;
}
return ret;
}
static bool restore_win32_apis()
{
GetTickCount_hooked = false;
GetModuleHandleA_hooked = false;
GetModuleHandleExA_hooked = false;
if (DetourTransactionBegin() != NO_ERROR) return false;
if (DetourUpdateThread(GetCurrentThread()) != NO_ERROR) return false;
DetourDetach((PVOID *)&actual_GetTickCount, (PVOID)GetTickCount_hook);
DetourDetach((PVOID *)&actual_GetModuleHandleA, (PVOID)GetModuleHandleA_hook);
DetourDetach((PVOID *)&actual_GetModuleHandleExA, (PVOID)GetModuleHandleExA_hook);
return DetourTransactionCommit() == NO_ERROR;
}
static std::vector<uint8_t> get_pe_header_disk()
{
const std::string filepath = pe_helpers::get_current_exe_path() + pe_helpers::get_current_exe_name();
try {
std::ifstream file(std::filesystem::u8path(filepath), std::ios::in | std::ios::binary);
if (!file) return {};
// 2MB is enough
std::vector<uint8_t> data(2 * 1024 * 1024, 0);
file.read((char *)&data[0], data.size());
file.close();
return data;
} catch(...) { }
return {};
}
static bool calc_bind_section_boundaries()
{
auto bind_section = pe_helpers::get_section_header_with_name(((HMODULE)exe_addr_base), ".bind");
if (bind_section) {
bind_addr_base = exe_addr_base + bind_section->VirtualAddress;
MEMORY_BASIC_INFORMATION mbi{};
if (VirtualQuery((LPVOID)bind_addr_base, &mbi, sizeof(mbi)) && mbi.RegionSize > 0) {
bind_addr_end = bind_addr_base + mbi.RegionSize;
} else if (bind_section->Misc.VirtualSize > 0) {
bind_addr_end = bind_addr_base + bind_section->Misc.VirtualSize;
} else {
return false;
}
return true;
}
// we don't *seem* to have .bind section *in memory*
// appid 1732190 changes the PIMAGE_OPTIONAL_HEADER->SizeOfHeaders to a size less than the actual,
// subtracting the size of the last section, i.e ".bind" section (original size = 0x600 >>> decreased to 0x400)
// that way whenever the .exe is loaded in memory, the Windows loader will ignore populating the PE header with the info
// of that section *in memory* since it is not taken into consideration, but the PE header *on disk* still contains the info
//
// also the PIMAGE_FILE_HEADER->NumberOfSections is kept intact, otherwise the PIMAGE_OPTIONAL_HEADER->AddressOfEntryPoint
// would be pointing at a non-existent section and the .exe won't work
auto disk_header = get_pe_header_disk();
if (disk_header.empty()) return false;
bind_section = pe_helpers::get_section_header_with_name(((HMODULE)&disk_header[0]), ".bind");
if (!bind_section) return false;
bind_addr_base = exe_addr_base + bind_section->VirtualAddress;
if (!bind_section->Misc.VirtualSize) return false;
bind_addr_end = bind_addr_base + bind_section->Misc.VirtualSize;
return true;
}
bool stubdrm::patch()
{
if (!calc_bind_section_boundaries()) return false;
auto addrOfEntry = exe_addr_base + pe_helpers::get_optional_header((HMODULE)exe_addr_base)->AddressOfEntryPoint;
if (addrOfEntry < bind_addr_base || addrOfEntry >= bind_addr_end) return false; // entry addr is not inside .bind
// find .bind variant
for (const auto &patt : all_bind_details) {
auto mem = pe_helpers::search_memory(
bind_addr_base,
static_cast<size_t>(bind_addr_end - bind_addr_base),
patt.bind_detection_patt);
if (mem) {
current_bind_idx = static_cast<size_t>(&patt - &all_bind_details[0]);
return redirect_win32_apis();
}
}
return false;
}
bool stubdrm::restore()
{
return restore_win32_apis();
}
void stubdrm::set_cleanup_cb(void (*fn)())
{
cleanup_cb = fn;
}