Prepare arxan patching

It's still fully broken
This commit is contained in:
momo5502 2022-05-28 19:13:44 +02:00
parent 362a8e7a4e
commit e28c72e643
6 changed files with 584 additions and 38 deletions

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@ -5,6 +5,8 @@
#include "steam/steam.hpp"
#include <utils/hook.hpp>
#include "utils/string.hpp"
#define ProcessDebugPort 7
#define ProcessDebugObjectHandle 30 // WinXP source says 31?
#define ProcessDebugFlags 31 // WinXP source says 32?
@ -277,21 +279,6 @@ namespace arxan
return STATUS_INVALID_HANDLE;
}
LONG WINAPI exception_filter(const LPEXCEPTION_POINTERS info)
{
if (info->ExceptionRecord->ExceptionCode == STATUS_INVALID_HANDLE)
{
return EXCEPTION_CONTINUE_EXECUTION;
}
if (info->ExceptionRecord->ExceptionCode == STATUS_ACCESS_VIOLATION)
{
//MessageBoxA(0, 0, "AV", 0);
}
return EXCEPTION_CONTINUE_SEARCH;
}
void hide_being_debugged()
{
auto* const peb = reinterpret_cast<PPEB>(__readgsqword(0x60));
@ -340,6 +327,22 @@ namespace arxan
loaded = true;
}
LONG WINAPI exception_filter(const LPEXCEPTION_POINTERS info)
{
if (info->ExceptionRecord->ExceptionCode == STATUS_INVALID_HANDLE)
{
return EXCEPTION_CONTINUE_EXECUTION;
}
if (info->ExceptionRecord->ExceptionCode == STATUS_ACCESS_VIOLATION)
{
//MessageBoxA(0, 0, "AV", 0);
//restore_debug_functions();
}
return EXCEPTION_CONTINUE_SEARCH;
}
const char* get_command_line_a_stub()
{
static auto cmd = []
@ -357,6 +360,247 @@ namespace arxan
}
}
uint64_t get_integrity_data_qword(const uint8_t* address)
{
const auto og_data = utils::hook::query_original_data(address, 8);
return *reinterpret_cast<const uint64_t*>(og_data.data());
}
uint32_t get_integrity_data_dword(const uint8_t* address)
{
const auto og_data = utils::hook::query_original_data(address, 4);
return *reinterpret_cast<const uint32_t*>(og_data.data());
}
uint8_t get_integrity_data_byte(const uint8_t* address)
{
const auto og_data = utils::hook::query_original_data(address, 1);
return og_data[0];
}
void patch_check_type_1_xor()
{
const auto checks = "8B 00 33 45 ??"_sig;
for(size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
utils::hook::jump(addr, utils::hook::assemble([addr](utils::hook::assembler& a)
{
a.push(rax);
a.pushad64();
a.mov(rcx, rax);
a.call_aligned(get_integrity_data_dword);
a.mov(rcx, qword_ptr(rsp, 128));
a.movzx(ecx, eax);
a.mov(qword_ptr(rsp, 128), rcx);
a.popad64();
a.pop(rax);
// xor eax, [rbp+??h]
a.embedUInt8(addr[3]);
a.embedUInt8(addr[4]);
a.embedUInt8(addr[5]);
a.jmp(addr + 5);
}));
}
}
void patch_check_type_1_direct()
{
auto patch_addr = [](uint8_t* addr)
{
// Skip false positives
// Prefixed 0x41 encodes a different instruction
if (addr[-1] == 0x41)
{
return;
}
utils::hook::jump(addr, utils::hook::assemble([addr](utils::hook::assembler& a)
{
a.push(rax);
a.pushad64();
a.mov(rcx, rax);
a.call_aligned(get_integrity_data_dword);
a.mov(rcx, qword_ptr(rsp, 128));
a.mov(ecx, eax);
a.mov(qword_ptr(rsp, 128), rcx);
a.popad64();
a.pop(rax);
a.embedUInt8(addr[3]);
a.embedUInt8(addr[4]);
a.embedUInt8(addr[5]);
a.jmp(addr + 5);
}));
};
// mov [rbp+??h], eax
auto checks = "8B 00 89 45 ??"_sig;
for(size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
patch_addr(addr);
}
// xor eax, [rbp+??h]
checks = "8B 00 33 45 ??"_sig;
for (size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
patch_addr(addr);
}
}
void patch_check_type_1_indirect()
{
auto patch_addr = [](uint8_t* addr)
{
const auto rex_prefixed = *addr == 0x48;
const auto jump_target = utils::hook::follow_branch(addr + (rex_prefixed ? 3 : 2));
utils::hook::jump(addr, utils::hook::assemble([addr, jump_target, rex_prefixed](utils::hook::assembler& a)
{
a.push(rax);
a.pushad64();
a.mov(rcx, rax);
if(rex_prefixed)
{
a.call_aligned(get_integrity_data_dword);
a.mov(rcx, qword_ptr(rsp, 128));
a.mov(ecx, eax);
a.mov(qword_ptr(rsp, 128), rcx);
}
else
{
a.mov(qword_ptr(rsp, 128), rax);
}
a.popad64();
a.pop(rax);
a.jmp(jump_target);
}));
};
// mov rax, [rax]; jmp ...
auto checks = "48 8B 00 E9"_sig;
for(size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
patch_addr(addr);
}
// mov eax, [rax]; jmp ...
checks = "8B 00 E9"_sig;
for (size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
patch_addr(addr);
}
}
void patch_check_type_2()
{
const auto checks = "0F B6 00 0F B6 C0 33 45 50 89 45 50"_sig;
for (size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
utils::hook::jump(addr, utils::hook::assemble([addr](utils::hook::assembler& a)
{
a.push(rax);
a.pushad64();
a.mov(rcx, rax);
a.call_aligned(get_integrity_data_byte);
a.mov(rcx, qword_ptr(rsp, 128));
a.movzx(ecx, al);
a.mov(qword_ptr(rsp, 128), rcx);
a.popad64();
a.pop(rax);
a.movzx(eax, al);
a.jmp(addr + 6);
}));
}
}
void patch_check_type_4()
{
const auto checks = "48 8B 04 10 48 89 45 20"_sig;
for (size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
utils::hook::jump(addr, utils::hook::assemble([addr](utils::hook::assembler& a)
{
a.mov(rax, qword_ptr(rax, rdx));
a.push(rax);
a.pushad64();
a.mov(rcx, rax);
a.call_aligned(get_integrity_data_qword);
a.mov(qword_ptr(rsp, 128), rax);
a.popad64();
a.pop(rax);
a.mov(qword_ptr(rbp, 0x20), rax);
a.jmp(addr + 8);
}));
}
}
void patch_check_type_5()
{
const auto checks = "0F B6 00 88 02"_sig;
for (size_t i = 0; i < checks.count(); ++i)
{
auto* addr = checks.get(i);
// Skip false positives
// Prefixed 0x41 encodes a different instruction
if(addr[-1] == 0x41)
{
continue;
}
utils::hook::jump(addr, utils::hook::assemble([addr](utils::hook::assembler& a)
{
a.push(rax);
a.pushad64();
a.mov(rcx, rax);
a.call_aligned(get_integrity_data_byte);
a.mov(rcx, qword_ptr(rsp, 128));
a.movzx(ecx, al);
a.mov(qword_ptr(rsp, 128), rcx);
a.popad64();
a.pop(rax);
a.mov(byte_ptr(rdx), al);
a.jmp(addr + 5);
}));
}
}
class component final : public component_interface
{
public:
@ -365,11 +609,8 @@ namespace arxan
hide_being_debugged();
scheduler::loop(hide_being_debugged, scheduler::pipeline::async);
//restore_debug_functions();
create_mutex_ex_a_hook.create(CreateMutexExA, create_mutex_ex_a_stub);
const utils::nt::library ntdll("ntdll.dll");
nt_close_hook.create(ntdll.get_proc<void*>("NtClose"), nt_close_stub);
@ -397,6 +638,15 @@ namespace arxan
}
}
void post_unpack() override
{
patch_check_type_1_direct();
patch_check_type_1_indirect();
patch_check_type_2();
patch_check_type_4();
patch_check_type_5();
}
void pre_destroy() override
{
utils::hook::copy(GetWindowTextA, this->window_text_buffer_, sizeof(this->window_text_buffer_));

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@ -28,12 +28,12 @@ namespace console
{
utils::hook::detour d;
d.create(0x142333B40_g, utils::hook::assemble([](utils::hook::assembler& a)
{
a.mov(r8, "BOIII Console");
a.mov(r9d, 0x80CA0000);
a.sub(eax, edx);
a.jmp(0x142333B4F_g);
}));
{
a.mov(r8, "BOIII Console");
a.mov(r9d, 0x80CA0000);
a.sub(eax, edx);
a.jmp(0x142333B4F_g);
}));
create_game_console();
}

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@ -110,16 +110,114 @@ namespace
return true;
}
class patch
{
public:
patch() = default;
patch(void* source, void* target)
: source_(source)
{
memcpy(this->data_, source, sizeof(this->data_));
utils::hook::jump(this->source_, target, true, true);
}
~patch()
{
if (source_)
{
utils::hook::copy(this->source_, this->data_, sizeof(this->data_));
}
}
patch(patch&& obj) noexcept
: patch()
{
this->operator=(std::move(obj));
}
patch& operator=(patch&& obj) noexcept
{
if (this != &obj)
{
this->~patch();
this->source_ = obj.source_;
memcpy(this->data_, obj.data_, sizeof(this->data_));
obj.source_ = nullptr;
}
return *this;
}
private:
void* source_{ nullptr };
uint8_t data_[15]{};
};
std::vector<patch> initialization_hooks{};
uint8_t* get_entry_point()
{
const utils::nt::library game{};
return game.get_ptr() + game.get_optional_header()->AddressOfEntryPoint;
}
std::vector<uint8_t*> get_tls_callbacks()
{
const utils::nt::library game{};
const auto& entry = game.get_optional_header()->DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS];
if(!entry.VirtualAddress || !entry.Size)
{
return {};
}
const auto* tls_dir = reinterpret_cast<IMAGE_TLS_DIRECTORY*>(game.get_ptr() + entry.VirtualAddress);
auto* callback = reinterpret_cast<uint8_t**>(tls_dir->AddressOfCallBacks);
std::vector<uint8_t*> addresses{};
while(callback && *callback)
{
addresses.emplace_back(*callback);
++callback;
}
return addresses;
}
int patch_main()
{
initialization_hooks.clear();
if(!run())
{
return 1;
}
return reinterpret_cast<int(*)()>(get_entry_point())();
}
void nullsub()
{
}
void patch_entry_point()
{
initialization_hooks.emplace_back(get_entry_point(), patch_main);
for(auto* tls_callback : get_tls_callbacks()) {
initialization_hooks.emplace_back(tls_callback, nullsub);
}
}
}
BOOL WINAPI DllMain(HINSTANCE, const DWORD reason, LPVOID)
{
if (reason == DLL_PROCESS_ATTACH)
{
if (!run())
{
return FALSE;
}
patch_entry_point();
}
return TRUE;
}

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@ -1,12 +1,162 @@
#include "hook.hpp"
#include <map>
#include <MinHook.h>
#include "concurrency.hpp"
#include "string.hpp"
#include <MinHook.h>
#ifdef max
#undef max
#endif
#ifdef min
#undef min
#endif
namespace utils::hook
{
namespace
{
uint8_t* allocate_somewhere_near(const void* base_address, const size_t size)
{
size_t offset = 0;
while (true)
{
offset += size;
auto* target_address = static_cast<const uint8_t*>(base_address) - offset;
if (is_relatively_far(base_address, target_address))
{
return nullptr;
}
const auto res = VirtualAlloc(const_cast<uint8_t*>(target_address), size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (res)
{
if (is_relatively_far(base_address, target_address))
{
VirtualFree(res, 0, MEM_RELEASE);
return nullptr;
}
return static_cast<uint8_t*>(res);
}
}
}
class memory
{
public:
memory() = default;
memory(const void* ptr)
: memory()
{
this->length_ = 0x1000;
this->buffer_ = allocate_somewhere_near(ptr, this->length_);
if (!this->buffer_)
{
throw std::runtime_error("Failed to allocate");
}
}
~memory()
{
if (this->buffer_)
{
VirtualFree(this->buffer_, 0, MEM_RELEASE);
}
}
memory(memory&& obj) noexcept
: memory()
{
this->operator=(std::move(obj));
}
memory& operator=(memory&& obj) noexcept
{
if(this != &obj)
{
this->~memory();
this->buffer_ = obj.buffer_;
this->length_ = obj.length_;
this->offset_ = obj.offset_;
obj.buffer_ = nullptr;
obj.length_ = 0;
obj.offset_ = 0;
}
return *this;
}
void* allocate(const size_t length)
{
if(!this->buffer_) {
return nullptr;
}
if(this->offset_ + length > this->length_) {
return nullptr;
}
const auto ptr = this->get_ptr();
this->offset_ += length;
return ptr;
}
void* get_ptr() const
{
return this->buffer_ + this->offset_;
}
private:
uint8_t* buffer_{};
size_t length_{};
size_t offset_{};
};
void* get_memory_near(const void* address, const size_t size)
{
static concurrency::container<std::vector<memory>> memory_container{};
return memory_container.access<void*>([&](std::vector<memory>& memories)
{
for(auto& memory : memories)
{
if(!is_relatively_far(address, memory.get_ptr()))
{
return memory.allocate(size);
}
}
memories.emplace_back(address);
return memories.back().allocate(size);
});
}
concurrency::container<std::map<const void*, uint8_t>>& get_original_data_map()
{
static concurrency::container<std::map<const void*, uint8_t>> og_data{};
return og_data;
}
void store_original_data(const void* data, size_t length)
{
get_original_data_map().access([data, length](std::map<const void*, uint8_t>& og_map)
{
const auto data_ptr = static_cast<const uint8_t*>(data);
for(size_t i = 0; i < length; ++i)
{
const auto pos = data_ptr + i;
if(!og_map.contains(pos))
{
og_map[pos] = *pos;
}
}
});
}
void* initialize_min_hook()
{
static class min_hook_init
@ -140,6 +290,7 @@ namespace utils::hook
{
this->clear();
this->place_ = place;
store_original_data(place, 14);
if (MH_CreateHook(this->place_, target, &this->original_) != MH_OK)
{
@ -192,6 +343,8 @@ namespace utils::hook
auto* const ptr = library.get_iat_entry(target_library, process);
if (!ptr) return false;
store_original_data(ptr, sizeof(*ptr));
DWORD protect;
VirtualProtect(ptr, sizeof(*ptr), PAGE_EXECUTE_READWRITE, &protect);
@ -203,6 +356,8 @@ namespace utils::hook
void nop(void* place, const size_t length)
{
store_original_data(place, length);
DWORD old_protect{};
VirtualProtect(place, length, PAGE_EXECUTE_READWRITE, &old_protect);
@ -219,6 +374,8 @@ namespace utils::hook
void copy(void* place, const void* data, const size_t length)
{
store_original_data(place, length);
DWORD old_protect{};
VirtualProtect(place, length, PAGE_EXECUTE_READWRITE, &old_protect);
@ -244,7 +401,15 @@ namespace utils::hook
{
if (is_relatively_far(pointer, data))
{
throw std::runtime_error("Too far away to create 32bit relative branch");
auto* trampoline = get_memory_near(pointer, 14);
if (!trampoline)
{
throw std::runtime_error("Too far away to create 32bit relative branch");
}
call(pointer, trampoline);
jump(trampoline, data, true, true);
return;
}
auto* patch_pointer = PBYTE(pointer);
@ -274,7 +439,14 @@ namespace utils::hook
if (!use_far && is_relatively_far(pointer, data))
{
throw std::runtime_error("Too far away to create 32bit relative branch");
auto* trampoline = get_memory_near(pointer, 14);
if(!trampoline)
{
throw std::runtime_error("Too far away to create 32bit relative branch");
}
jump(pointer, trampoline);
jump(trampoline, data, true, true);
return;
}
auto* patch_pointer = PBYTE(pointer);
@ -386,4 +558,26 @@ namespace utils::hook
return extract<void*>(data + 1);
}
std::vector<uint8_t> query_original_data(const void* data, const size_t length)
{
std::vector<uint8_t> og_data{};
og_data.resize(length);
memcpy(og_data.data(), data, length);
get_original_data_map().access([data, length, &og_data](const std::map<const void*, uint8_t>& og_map)
{
auto* ptr = static_cast<const uint8_t*>(data);
for(size_t i = 0; i < length; ++i)
{
auto entry = og_map.find(ptr + i);
if(entry != og_map.end())
{
og_data[i] = entry->second;
}
}
});
return og_data;
}
}

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@ -186,13 +186,7 @@ namespace utils::hook
template <typename T>
static void set(void* place, T value)
{
DWORD old_protect;
VirtualProtect(place, sizeof(T), PAGE_EXECUTE_READWRITE, &old_protect);
*static_cast<T*>(place) = value;
VirtualProtect(place, sizeof(T), old_protect, &old_protect);
FlushInstructionCache(GetCurrentProcess(), place, sizeof(T));
copy(place, &value, sizeof(value));
}
template <typename T>
@ -212,4 +206,6 @@ namespace utils::hook
{
return static_cast<T(*)(Args ...)>(func)(args...);
}
std::vector<uint8_t> query_original_data(const void* data, size_t length);
}

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@ -4,6 +4,14 @@
#include <intrin.h>
#ifdef max
#undef max
#endif
#ifdef min
#undef min
#endif
namespace utils::hook
{
void signature::load_pattern(const std::string& pattern)