mirror of
https://github.com/hasherezade/tiny_tracer
synced 2026-06-08 14:36:37 +00:00
hasherezade
476 lines
19 KiB
C++
476 lines
19 KiB
C++
#include "AntiDebug.h"
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <map>
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#include "ProcessInfo.h"
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#include "Util.h"
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#include "TraceLog.h"
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#include "Settings.h"
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#include "PinLocker.h"
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#include "TinyTracer.h"
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#include "win/win_paths.h"
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#define ANTIDBG_LABEL "[ANTIDEBUG] --> "
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using namespace LEVEL_PINCLIENT;
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/* ================================================================== */
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// Global variables used by AntiDebug
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/* ================================================================== */
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ADDRINT pebAddr = 0;
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ADDRINT heapFlags = 0;
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ADDRINT heapForceFlags = 0;
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std::vector<std::string> loadedLib;
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std::map<std::string, std::string> funcToLink;
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typedef VOID AntiDBGCallBack(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5);
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/* ==================================================================== */
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// Leveraging the existing paramToStr, extracts only the string after '->'
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/* ==================================================================== */
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std::wstring paramToStrSplit(VOID* arg1)
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{
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if (arg1 == NULL) {
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return L"0";
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}
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std::wstring inStr = paramToStr(arg1);
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size_t arrowPos = inStr.find(L"->");
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if (arrowPos != 0) {
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// Extract the substring after the arrow symbol and contained in quotes
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std::wstring secondPart = inStr.substr(arrowPos + 3);
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size_t startPos = secondPart.find('"');
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if (startPos != std::string::npos) {
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size_t endPos = secondPart.rfind('"');
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if (endPos != std::string::npos) {
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secondPart = secondPart.substr(startPos + 1, endPos - startPos - 1);
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}
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}
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return secondPart;
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}
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return L"0";
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}
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/* ==================================================================== */
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// Wrappers for Windows functions
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/* ==================================================================== */
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BOOL WinIsNativeOs32(void)
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{
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BOOL isNativeOs32 = FALSE;
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#ifndef _WIN64
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{ // scope
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using namespace WINDOWS;
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WINDOWS::BOOL(WINAPI * _IsWow64Process)(HANDLE, WINDOWS::PBOOL) =
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(WINDOWS::BOOL(WINAPI*)(HANDLE, WINDOWS::PBOOL)) WINDOWS::GetProcAddress(GetModuleHandleA("kernel32"), "IsWow64Process");
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if (!_IsWow64Process) {
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return TRUE; //function not found -> 32-bit system
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}
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WINDOWS::BOOL isWow64 = FALSE;
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_IsWow64Process(WINDOWS::GetCurrentProcess(), &isWow64);
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isNativeOs32 = !isWow64;
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} // !scope
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#endif
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return isNativeOs32;
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}
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BOOL WinIsWindowsVistaOrGreater(void)
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{
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using namespace WINDOWS;
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DWORD dwVersion = WINDOWS::GetVersion();
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DWORD dwMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
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DWORD dwMinorVersion = (DWORD)(HIBYTE(LOWORD(dwVersion)));
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if (dwMajorVersion >= 6) {
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return TRUE;
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}
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return FALSE;
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}
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/* ==================================================================== */
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// Log info with antidebug label
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/* ==================================================================== */
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VOID LogAntiDbg(const ADDRINT insAddr, const char* msg, const char *link=nullptr)
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{
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if (!msg) return;
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const ADDRINT RvaFrom = addr_to_rva(insAddr);
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std::stringstream ss;
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ss << std::hex << RvaFrom << TraceLog::DELIMITER << ANTIDBG_LABEL << msg;
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if (link) {
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ss << TraceLog::DELIMITER << link;
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}
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traceLog.logLine(ss.str());
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}
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/* ==================================================================== */
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// Callback function to be executed when memory is accessed
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/* ==================================================================== */
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VOID AntidebugMemoryAccess(ADDRINT addr, UINT32 size, const ADDRINT insAddr)
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{
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PinLocker locker;
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if (isWatchedAddress(insAddr) == WatchedType::NOT_WATCHED) return;
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// Check the accessed memory address for antidebug tricks
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if (addr == pebAddr + 2) {
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return LogAntiDbg(insAddr, "PEB!BeingDebugged accessed");
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}
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if (addr == 0x7ffe02d4) {
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return LogAntiDbg(insAddr, "KUSER_SHARED_DATA accessed",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#kuser_shared_data");
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}
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#ifdef _WIN64
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if (addr == pebAddr + 0xBC) {
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return LogAntiDbg(insAddr, "PEB!NtGlobalFlag accessed");
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}
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if (addr == heapFlags || addr == heapForceFlags) {
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return LogAntiDbg(insAddr, "Heap Flags accessed",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#manual-checks-heap-flags");
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}
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#else
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if (addr == pebAddr + 0x68) {
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return LogAntiDbg(insAddr, "PEB!NtGlobalFlag accessed");
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}
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if (addr == heapFlags || addr == heapForceFlags) {
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return LogAntiDbg(insAddr, "Heap Flags accessed",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#manual-checks-heap-flags");
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}
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#endif
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}
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VOID FlagsCheck(const CONTEXT* ctxt)
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{
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PinLocker locker;
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const ADDRINT Address = (ADDRINT)PIN_GetContextReg(ctxt, REG_INST_PTR);
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const WatchedType wType = isWatchedAddress(Address);
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if (wType == WatchedType::NOT_WATCHED) return;
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ADDRINT pushedVal = UNKNOWN_ADDR;
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const ADDRINT* stackPtr = reinterpret_cast<ADDRINT*>(PIN_GetContextReg(ctxt, REG_STACK_PTR));
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size_t copiedSize = PIN_SafeCopy(&pushedVal, stackPtr, sizeof(pushedVal));
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if (copiedSize != sizeof(pushedVal)) {
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return;
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}
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const bool isTrap = (pushedVal & 0x100) ? true : false;
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if (!isTrap) return;
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return LogAntiDbg(Address, "Trap Flag set");
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}
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/* ==================================================================== */
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// Process API calls (related to AntiDebug techniques)
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/* ==================================================================== */
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VOID AntiDbgLogFuncOccurrence(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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PinLocker locker;
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std::stringstream ss;
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ss << "^ " << name;
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auto itr = funcToLink.find(name);
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if (itr != funcToLink.end()) {
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return LogAntiDbg(Address, ss.str().c_str(),
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itr->second.c_str());
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}
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return LogAntiDbg(Address, ss.str().c_str());
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}
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VOID AntiDbg_LoadLibrary(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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if (!argCount) return;
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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if (!arg1 || !PIN_CheckReadAccess(arg1)) return;
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// Track LoadLibraryX to detect access to LOAD_DLL_DEBUG_INFO
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// Get the library name from argument
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std::wstring argStr = paramToStrSplit(arg1);
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// Convert from wide string for comparison
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std::string _argStr(argStr.begin(), argStr.end());
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loadedLib.push_back(_argStr);
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}
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VOID AntiDbg_RaiseException(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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if (!argCount) return;
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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// RaiseException constants
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enum ExceptionCode { kDBG_CONTROL_C = 0x40010005, kDBG_RIPEVENT = 0x40010007 };
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// kernel32!RaiseException() with DBG_CONTROL_C or DBG_RIPEVENT
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if (int((size_t)arg1) == ExceptionCode::kDBG_CONTROL_C || int((size_t)arg1) == ExceptionCode::kDBG_RIPEVENT) {
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return LogAntiDbg(Address, "^ kernel32!RaiseException()",
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"https://anti-debug.checkpoint.com/techniques/exceptions.html#raiseexception");
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}
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}
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VOID AntiDbg_NtQuerySystemInformation(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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if (!argCount) return;
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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enum SystemInformationClass { SystemKernelDebuggerInformation = 0x23 };
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// function ntdll!NtQuerySystemInformation() with first parameter set to 0x23 (SystemKernelDebuggerInformation)
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if (int((size_t)arg1) == SystemInformationClass::SystemKernelDebuggerInformation) {
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return LogAntiDbg(Address, "^ ntdll!NtQuerySystemInformation (SystemKernelDebuggerInformation)",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-checks-ntquerysysteminformation");
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}
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}
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VOID AntiDbg_NtQueryInformationProcess(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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if (argCount < 2) return;
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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enum ProcessInformationClass { ProcessDebugPort = 0x7, ProcessDebugFlags = 0x1f, ProcessDebugObjectHandle = 0x1e };
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// function ntdll!NtQueryInformationProcess with ProcessInformationClass == 7 (ProcessDebugPort)
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if (int((size_t)arg2) == ProcessInformationClass::ProcessDebugPort) {
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return LogAntiDbg(Address, "^ ntdll!NtQueryInformationProcess (ProcessDebugPort)",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-ntqueryinformationprocess-processdebugport");
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}
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// function ntdll!NtQueryInformationProcess with ProcessInformationClass == 0x1f (ProcessDebugFlags)
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if (int((size_t)arg2) == ProcessInformationClass::ProcessDebugFlags) {
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return LogAntiDbg(Address, "^ ntdll!NtQueryInformationProcess (ProcessDebugFlags)",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-ntqueryinformationprocess-processdebugflags");
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}
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// function ntdll!NtQueryInformationProcess with ProcessInformationClass == 0x1e (ProcessDebugObjectHandle)
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if (int((size_t)arg2) == ProcessInformationClass::ProcessDebugObjectHandle) {
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return LogAntiDbg(Address, "^ ntdll!NtQueryInformationProcess (ProcessDebugObjectHandle)",
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"https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-ntqueryinformationprocess-processdebugobjecthandle");
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}
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}
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VOID AntiDbg_NtQueryObject(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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if (argCount < 2) return;
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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enum ObjectInformationClass { ObjectAllTypesInformation = 3 };
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// ntdll!NtQueryObject() to access DebugObject (with ObjectAllTypesInformation as 2nd argument)
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if (int((size_t)arg2) == ObjectInformationClass::ObjectAllTypesInformation) {
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return LogAntiDbg(Address, "^ ntdll!NtQueryObject (ObjectAllTypesInformation)",
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"https://anti-debug.checkpoint.com/techniques/object-handles.html#ntqueryobject");
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}
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}
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VOID AntiDbg_CreateFile(const ADDRINT Address, const CHAR* name, uint32_t argCount, VOID* arg1, VOID* arg2, VOID* arg3, VOID* arg4, VOID* arg5)
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{
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if (argCount < 3) return;
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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// kernel32!CreateFileX called on the module itself with Exclusive access, or on loaded libraries
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// Check only exclusive accesses for optimization
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if (int((size_t)arg3) == 0) {
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IMG img = IMG_FindByAddress(Address);
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if (!IMG_Valid(img)) return;
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if (!arg1 || !PIN_CheckReadAccess(arg1)) return;
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// Get the module name from image
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std::string moduleName = IMG_Name(img);
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// Get the module name from arguments
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std::wstring argStr = paramToStrSplit(arg1);
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// Convert from wide string for comparison
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std::string _argStr(argStr.begin(), argStr.end());
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// Check if open is done on module
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if (util::isStrEqualI(_argStr, moduleName)) {
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return LogAntiDbg(Address, "^ kernel32!CreateFile on module",
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"https://anti-debug.checkpoint.com/techniques/object-handles.html#createfile");
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}
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// Check if open is done on loaded libraries
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for (size_t i = 0; i < loadedLib.size(); i++) {
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if (util::isStrEqualI(_argStr, loadedLib[i])) {
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return LogAntiDbg(Address, "^ kernel32!CreateFile on loaded lib",
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"https://anti-debug.checkpoint.com/techniques/object-handles.html#loadlibrary");
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}
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}
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}
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}
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/* ==================================================================== */
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// Collect some infos at Thread start, to be used later in checks
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/* ==================================================================== */
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VOID ThreadStart(THREADID threadid, CONTEXT* ctxt, INT32 flags, VOID* v)
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{
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PinLocker locker;
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// Checks only the first thread
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if (threadid != 0) {
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return;
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}
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#ifdef _WIN64
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// Read the value from the memory address pointed by GS:[60h] and save it in the global variable
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ADDRINT gsValue;
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PIN_GetContextRegval(ctxt, REG_SEG_GS_BASE, reinterpret_cast<UINT8*>(&gsValue));
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gsValue += 0x60;
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// Save PEB Address
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PIN_SafeCopy(&pebAddr, reinterpret_cast<VOID*>(gsValue), sizeof(pebAddr));
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// Get Heap flags addresses (https://anti-debug.checkpoint.com/techniques/debug-flags.html#manual-checks-heap-flags)
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ADDRINT heapBase;
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PIN_SafeCopy(&heapBase, reinterpret_cast<VOID*>(pebAddr + 0x30), sizeof(heapBase));
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ADDRINT heapFlagsOffset = WinIsWindowsVistaOrGreater()
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? 0x70
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: 0x14;
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ADDRINT heapForceFlagsOffset = WinIsWindowsVistaOrGreater()
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? 0x74
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: 0x18;
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heapFlags = heapBase + heapFlagsOffset;
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heapForceFlags = heapBase + heapForceFlagsOffset;
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#else
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// Read the value from the memory address pointed by FS:[30h] and save it in the global variable
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ADDRINT fsValue;
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PIN_GetContextRegval(ctxt, REG_SEG_FS_BASE, reinterpret_cast<UINT8*>(&fsValue));
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fsValue += 0x30;
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// Save PEB Address
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PIN_SafeCopy(&pebAddr, reinterpret_cast<VOID*>(fsValue), sizeof(pebAddr));
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// Get Heap flags addresses (https://anti-debug.checkpoint.com/techniques/debug-flags.html#manual-checks-heap-flags)
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ADDRINT heapBase;
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ADDRINT heapBaseOffset = WinIsNativeOs32()
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? 0x18
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: 0x1030;
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PIN_SafeCopy(&heapBase, reinterpret_cast<VOID*>(pebAddr + heapBaseOffset), sizeof(heapBase));
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ADDRINT heapFlagsOffset = WinIsWindowsVistaOrGreater()
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? 0x40
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: 0x0C;
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ADDRINT heapForceFlagsOffset = WinIsWindowsVistaOrGreater()
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? 0x44
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: 0x10;
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heapFlags = heapBase + heapFlagsOffset;
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heapForceFlags = heapBase + heapForceFlagsOffset;
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#endif
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}
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//* ==================================================================== */
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// "CloseHandle" instrumentation, detects invalid handlers
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/* ===================================================================== */
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VOID AntiDbg_After_CloseHandle(ADDRINT Address, ADDRINT result)
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{
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PinLocker locker;
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if (isWatchedAddress(Address) == WatchedType::NOT_WATCHED) return;
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if (!result) {
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// Invalid closure
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return LogAntiDbg(Address, "^ kernel32!CloseHandle (INVALID_HNDL_VAL)",
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"https://anti-debug.checkpoint.com/techniques/object-handles.html#closehandle");
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}
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}
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/* ==================================================================== */
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// Add single function
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/* ==================================================================== */
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bool AntiDbgAddCallbackBefore(IMG Image, char* fName, uint32_t argNum, AntiDBGCallBack callback)
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{
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const size_t argMax = 5;
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if (argNum > argMax) argNum = argMax;
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RTN funcRtn = RTN_FindByName(Image, fName);
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if (RTN_Valid(funcRtn)) {
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RTN_Open(funcRtn);
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RTN_InsertCall(funcRtn, IPOINT_BEFORE, AFUNPTR(callback),
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IARG_RETURN_IP,
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IARG_ADDRINT, fName,
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IARG_UINT32, argNum,
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IARG_FUNCARG_ENTRYPOINT_VALUE, 0,
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IARG_FUNCARG_ENTRYPOINT_VALUE, 1,
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IARG_FUNCARG_ENTRYPOINT_VALUE, 2,
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IARG_FUNCARG_ENTRYPOINT_VALUE, 3,
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IARG_FUNCARG_ENTRYPOINT_VALUE, 4,
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IARG_END
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);
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RTN_Close(funcRtn);
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return true;
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}
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return false;
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}
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/* ==================================================================== */
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// Add to monitored functions all the API needed for AntiDebug.
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// Called by ImageLoad
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/* ==================================================================== */
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VOID AntidebugMonitorFunctions(IMG Image)
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{
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funcToLink["IsDebuggerPresent"] = "https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-isdebuggerpresent";
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funcToLink["CheckRemoteDebuggerPresent"] = "https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-checkremotedebuggerpresent";
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funcToLink["RtlQueryProcessHeapInformation"] = "https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-checks-rtlqueryprocessheapinformation";
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funcToLink["RtlQueryProcessDebugInformation"] = "https://anti-debug.checkpoint.com/techniques/debug-flags.html#using-win32-api-checks-rtlqueryprocessdebuginformation";
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funcToLink["HeapWalk"] = "https://anti-debug.checkpoint.com/techniques/debug-flags.html#manual-checks-heap-protection";
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funcToLink["CsrGetProcessId"] = "https://anti-debug.checkpoint.com/techniques/object-handles.html#openprocess";
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funcToLink["SetUnhandledExceptionFilter"] = "https://anti-debug.checkpoint.com/techniques/exceptions.html#unhandledexceptionfilter";
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funcToLink["RaiseException"] = "https://anti-debug.checkpoint.com/techniques/exceptions.html#raiseexception";
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// API needed for Antidebug
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const std::string dllName = util::getDllName(IMG_Name(Image));
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if (util::iequals(dllName, "ntdll")) {
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AntiDbgAddCallbackBefore(Image, "CsrGetProcessId", 0, AntiDbgLogFuncOccurrence);
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AntiDbgAddCallbackBefore(Image, "RtlQueryProcessHeapInformation", 1, AntiDbgLogFuncOccurrence);
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AntiDbgAddCallbackBefore(Image, "RtlQueryProcessDebugInformation", 3, AntiDbgLogFuncOccurrence);
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AntiDbgAddCallbackBefore(Image, "NtQueryInformationProcess", 5, AntiDbg_NtQueryInformationProcess);
|
|
AntiDbgAddCallbackBefore(Image, "NtQuerySystemInformation", 4, AntiDbg_NtQuerySystemInformation);
|
|
|
|
////////////////////////////////////
|
|
// If AntiDebug level is Deep
|
|
////////////////////////////////////
|
|
if (m_Settings.antidebug >= ANTIDEBUG_DEEP) {
|
|
AntiDbgAddCallbackBefore(Image, "NtQueryObject", 5, AntiDbg_NtQueryObject);
|
|
}
|
|
}
|
|
if (util::iequals(dllName, "kernel32")) {
|
|
AntiDbgAddCallbackBefore(Image, "LoadLibraryW", 1, AntiDbg_LoadLibrary);
|
|
AntiDbgAddCallbackBefore(Image, "LoadLibraryA", 1, AntiDbg_LoadLibrary);
|
|
AntiDbgAddCallbackBefore(Image, "CreateFileW", 5, AntiDbg_CreateFile);
|
|
AntiDbgAddCallbackBefore(Image, "CreateFileA", 5, AntiDbg_CreateFile);
|
|
AntiDbgAddCallbackBefore(Image, "IsDebuggerPresent", 0, AntiDbgLogFuncOccurrence);
|
|
AntiDbgAddCallbackBefore(Image, "CheckRemoteDebuggerPresent", 2, AntiDbgLogFuncOccurrence);
|
|
AntiDbgAddCallbackBefore(Image, "HeapWalk", 2, AntiDbgLogFuncOccurrence);
|
|
AntiDbgAddCallbackBefore(Image, "SetUnhandledExceptionFilter", 1, AntiDbgLogFuncOccurrence);
|
|
AntiDbgAddCallbackBefore(Image, "RaiseException", 4, AntiDbg_RaiseException);
|
|
}
|
|
|
|
// CloseHandle return value hook
|
|
RTN funcRtn = RTN_FindByName(Image, "CloseHandle");
|
|
if (!RTN_Valid(funcRtn)) return; // failed
|
|
|
|
RTN_Open(funcRtn);
|
|
|
|
RTN_InsertCall(funcRtn, IPOINT_AFTER, AFUNPTR(AntiDbg_After_CloseHandle),
|
|
IARG_RETURN_IP,
|
|
IARG_FUNCRET_EXITPOINT_VALUE,
|
|
IARG_END);
|
|
|
|
RTN_Close(funcRtn);
|
|
}
|