chenx221/Textractor
1
0
Fork 0
forked from Public-Mirror/Textractor
Code Pull Requests Activity

hook search through all exported functions, hook search deeper into stack, fix bug with dlls being loaded next to each other

Browse Source
This commit is contained in:
Akash Mozumdar 2019-09-04 12:23:23 -04:00
parent 3794afc7c4
commit 96f235732c
3 changed files with 62 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
GUI/mainwindow.cpp
View File

@ -500,8 +500,16 @@ void MainWindow::FindHooks()
layout.addWidget(&startButton);
connect(&startButton, &QPushButton::clicked, &dialog, &QDialog::accept);
if (!dialog.exec()) return;
QByteArray pattern = QByteArray::fromHex(patternInput.text().replace("??", QString::number(XX, 16)).toUtf8());
memcpy(sp.pattern, pattern.data(), sp.length = min(pattern.size(), 25));
if (patternInput.text().contains('.'))
{
wcsncpy_s(sp.module, S(patternInput.text()).c_str(), MAX_MODULE_SIZE - 1);
sp.length = 1;
}
else
{
QByteArray pattern = QByteArray::fromHex(patternInput.text().replace("??", QString::number(XX, 16)).toUtf8());
memcpy(sp.pattern, pattern.data(), sp.length = min(pattern.size(), PATTERN_SIZE));
}
try { filter = S(filterInput.text()); } catch (std::regex_error) {}
}
else
@ -510,10 +518,13 @@ void MainWindow::FindHooks()
filter = std::wregex(cjkCheckbox.isChecked() ? L"[\\u3000-\\ua000]{4,}" : L"[\\u0020-\\u1000]{4,}");
}
auto hooks = std::make_shared<std::vector<std::pair<HookParam, std::wstring>>>();
auto hooks = std::make_shared<std::vector<QString>>();
try
{
Host::FindHooks(processId, sp, [hooks, filter](HookParam hp, const std::wstring& text) { if (std::regex_search(text, filter)) hooks->push_back({ hp, text }); });
Host::FindHooks(processId, sp, [hooks, processId, filter](HookParam hp, const std::wstring& text)
{
if (std::regex_search(text, filter)) hooks->push_back(S(Util::GenerateCode(hp, processId) + L" => " + text));
});
}
catch (std::out_of_range) { return; }
std::thread([this, hooks, processId]
@ -529,8 +540,7 @@ void MainWindow::FindHooks()
hookList->setAttribute(Qt::WA_DeleteOnClose);
hookList->resize({ 750, 300 });
hookList->setWindowTitle(SEARCH_FOR_HOOKS);
for (auto [hp, text] : *hooks)
new QListWidgetItem(S(Util::GenerateCode(hp, processId) + L" => " + text), hookList);
for (const auto& hook : *hooks) new QListWidgetItem(hook, hookList);
connect(hookList, &QListWidget::itemClicked, [this](QListWidgetItem* item) { AddHook(item->text().split(" => ")[0]); });
hookList->show();
@ -538,8 +548,11 @@ void MainWindow::FindHooks()
if (!saveFileName.isEmpty())
{
QTextFile saveFile(saveFileName, QIODevice::WriteOnly | QIODevice::Truncate);
for (auto [hp, text] : *hooks)
saveFile.write(S(Util::GenerateCode(hp, processId) + L" => " + text + L"\n").toUtf8());
for (const auto& hook : *hooks)
{
saveFile.write(hook.toUtf8());
saveFile.write("\n");
}
}
hooks->clear();
});

1
include/types.h
View File

@ -67,6 +67,7 @@ struct SearchParam
maxRecords = 100000,
codepage = SHIFT_JIS;
uintptr_t padding = 0, minAddress = 0, maxAddress = (uintptr_t)-1;
wchar_t module[MAX_MODULE_SIZE] = {};
wchar_t text[PATTERN_SIZE] = {}; // text to search for
void(*hookPostProcessor)(HookParam&) = nullptr;
};

48
texthook/hookfinder.cc
View File

@ -15,7 +15,7 @@ namespace
{
SearchParam sp;
constexpr int CACHE_SIZE = 500'000;
constexpr int MAX_STRING_SIZE = 500, CACHE_SIZE = 300'000;
struct HookRecord
{
~HookRecord()
@ -32,7 +32,7 @@ namespace
}
uint64_t address = 0;
int offset = 0;
char text[500] = {};
char text[MAX_STRING_SIZE] = {};
};
std::unique_ptr<HookRecord[]> records;
long recordsAvailable;
@ -114,18 +114,31 @@ namespace
#endif
}
bool IsBadStrPtr(void* str)
{
if (str < (void*)0x1000) return true;
MEMORY_BASIC_INFORMATION info;
if (VirtualQuery(str, &info, sizeof(info)) == 0 || info.Protect < PAGE_READONLY || info.Protect & (PAGE_GUARD | PAGE_NOACCESS)) return true;
void* regionEnd = (BYTE*)info.BaseAddress + info.RegionSize;
if ((BYTE*)str + MAX_STRING_SIZE <= regionEnd) return false;
return IsBadStrPtr(regionEnd);
}
void Send(char** stack, uintptr_t address)
{
// it is unsafe to call ANY external functions from this, as they may have been hooked (if called the hook would call this function making an infinite loop)
// the exceptions are compiler intrinsics like _InterlockedDecrement
if (recordsAvailable <= 0) return;
for (int i = -registers; i < 6; ++i)
for (int i = -registers; i < 10; ++i)
{
int length = 0, sum = 0;
char* str = stack[i] + sp.padding;
__try { for (; (str[length] || str[length + 1]) && length < 500; length += 2) sum += str[length] + str[length + 1]; }
if (IsBadStrPtr(str)) return; // seems to improve performance; TODO: more tests and benchmarks to confirm
__try { for (; (str[length] || str[length + 1]) && length < MAX_STRING_SIZE; length += 2) sum += str[length] + str[length + 1]; }
__except (EXCEPTION_EXECUTE_HANDLER) {}
if (length > STRING && length < 499)
if (length > STRING && length < MAX_STRING_SIZE - 1)
{
__try
{
@ -156,6 +169,24 @@ void Send(char** stack, uintptr_t address)
}
}
std::vector<uint64_t> GetFunctions(uintptr_t module)
{
if (!module) return {};
IMAGE_DOS_HEADER* dosHeader = (IMAGE_DOS_HEADER*)module;
if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE) return {};
IMAGE_NT_HEADERS* ntHeader = (IMAGE_NT_HEADERS*)(module + dosHeader->e_lfanew);
if (ntHeader->Signature != IMAGE_NT_SIGNATURE) return {};
DWORD exportAddress = ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
if (!exportAddress) return {};
IMAGE_EXPORT_DIRECTORY* exportDirectory = (IMAGE_EXPORT_DIRECTORY*)(module + exportAddress);
std::vector<uint64_t> functions;
for (int i = 0; i < exportDirectory->NumberOfNames; ++i)
//char* funcName = (char*)(module + *(DWORD*)(module + exportDirectory->AddressOfNames + i * sizeof(DWORD)));
functions.push_back(module + *(DWORD*)(module + exportDirectory->AddressOfFunctions +
sizeof(DWORD) * *(WORD*)(module + exportDirectory->AddressOfNameOrdinals + i * sizeof(WORD))));
return functions;
}
void SearchForHooks(SearchParam spUser)
{
std::thread([=]
@ -175,12 +206,13 @@ void SearchForHooks(SearchParam spUser)
{
VirtualQuery((void*)moduleStopAddress, &info, sizeof(info));
moduleStopAddress = (uintptr_t)info.BaseAddress + info.RegionSize;
} while (info.Protect > PAGE_NOACCESS);
} while (info.Protect > PAGE_EXECUTE);
moduleStopAddress -= info.RegionSize;
ConsoleOutput(STARTING_SEARCH);
std::vector<uint64_t> addresses = Util::SearchMemory(sp.pattern, sp.length, PAGE_EXECUTE, sp.minAddress, sp.maxAddress);
for (auto& addr : addresses) addr += sp.offset;
std::vector<uint64_t> addresses;
if (*sp.module) addresses = GetFunctions((uintptr_t)GetModuleHandleW(sp.module));
else for (auto& addr : addresses = Util::SearchMemory(sp.pattern, sp.length, PAGE_EXECUTE, sp.minAddress, sp.maxAddress)) addr += sp.offset;
addresses.erase(std::remove_if(addresses.begin(), addresses.end(), [&](uint64_t addr) { return addr > moduleStartAddress && addr < moduleStopAddress; }), addresses.end());
*(void**)(trampoline + send_offset) = Send;
auto trampolines = (decltype(trampoline)*)VirtualAlloc(NULL, sizeof(trampoline) * addresses.size(), MEM_COMMIT, PAGE_READWRITE);