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refactor hooking code and add some more logging

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This commit is contained in:
Akash Mozumdar 2018-11-04 20:48:27 -05:00
parent 46ffaf017c
commit 3db253c790
2 changed files with 121 additions and 153 deletions
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271
vnrhook/hijack/texthook.cc
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@ -26,34 +26,22 @@ TextHook *hookman;
namespace { // unnamed namespace { // unnamed
#ifndef _WIN64 #ifndef _WIN64
const BYTE common_hook[] = { BYTE common_hook[] = {
0x9c, // pushfd 0x9c, // pushfd
0x60, // pushad 0x60, // pushad
0x9c, // pushfd 0x9c, // pushfd ; Artikash 11/4/2018: not sure why pushfd happens twice. Anyway, after this a total of 0x28 bytes are pushed
0x8d,0x54,0x24,0x28, // lea edx,[esp+0x28] ; esp value 0x8d, 0x44, 0x24, 0x28, // lea eax,[esp+0x28]
0x8b,0x32, // mov esi,[edx] ; return address 0x50, // push eax ; dwDatabase
0xb9, 0,0,0,0, // mov ecx, $ ; pointer to TextHook 0xb9, 0,0,0,0, // mov ecx,@this
0xe8, 0,0,0,0, // call @hook 0xbb, 0,0,0,0, // mov ebx,@TextHook::Send
0xff, 0xd3, // call ebx
0x9d, // popfd 0x9d, // popfd
0x61, // popad 0x61, // popad
0x9d, // popfd 0x9d, // popfd
0xe9 // jmp @original 0x68, 0,0,0,0, // push @original
0xc3 // ret ; basically absolute jmp to @original
}; };
__declspec(naked) // jichi 10/2/2013: No prolog and epilog
int ProcessHook(DWORD dwDataBase, DWORD dwRetn, TextHook *hook) // Use SEH to ensure normal execution even bad hook inserted.
{
// jichi 12/17/2013: The function parameters here are meaning leass. The parameters are in esi and edi
__asm
{
push esi
push edx
call TextHook::Send
retn // jichi 12/13/2013: return near, see: http://stackoverflow.com/questions/1396909/ret-retn-retf-how-to-use-them
}
}
#else #else
const BYTE common_hook[] = { const BYTE common_hook[] = {
0x9c, // push rflags 0x9c, // push rflags
@ -114,109 +102,96 @@ bool TextHook::InsertHook()
} }
#ifndef _WIN64 #ifndef _WIN64
// jichi 12/2/2013: This function mostly return 0.
// It return the hook address only for auxiliary case.
// However, because no known hooks are auxiliary, this function always return 0.
//
// jichi 5/11/2014: // jichi 5/11/2014:
// - dwDataBase: the stack address // - dwDataBase: the stack address
// - dwRetn: the return address of the hook void TextHook::Send(DWORD dwDataBase)
DWORD TextHook::Send(DWORD dwDataBase, DWORD dwRetn)
{ {
DWORD ret = 0; __try
ITH_WITH_SEH(ret = UnsafeSend(dwDataBase, dwRetn)); {
return ret; DWORD dwCount,
} dwAddr,
dwDataIn,
dwRetn,
dwSplit;
BYTE pbData[PIPE_BUFFER_SIZE];
DWORD dwType = hp.type;
DWORD TextHook::UnsafeSend(DWORD dwDataBase, DWORD dwRetn) dwAddr = hp.insertion_address;
{ dwRetn = *(DWORD*)dwDataBase; // first value on stack (if hooked start of function, this is return address)
DWORD dwCount,
dwAddr,
dwDataIn,
dwSplit;
BYTE pbData[PIPE_BUFFER_SIZE];
DWORD dwType = hp.type;
dwAddr = hp.insertion_address; /** jichi 12/24/2014
* @param addr function address
* @param frame real address of the function, supposed to be the same as addr
* @param stack address of current stack - 4
* @return If success, which is reverted
*/
if (::trigger)
::trigger = Engine::InsertDynamicHook((LPVOID)dwAddr, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase - 0x18));
/** jichi 12/24/2014 // jichi 10/24/2014: generic hook function
* @param addr function address if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp))
* @param frame real address of the function, supposed to be the same as addr hp.hook_fun = nullptr;
* @param stack address of current stack - 4
* @return If success, which is reverted
*/
if (::trigger)
::trigger = Engine::InsertDynamicHook((LPVOID)dwAddr, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase - 0x18));
// jichi 10/24/2014: generic hook function if (dwType & HOOK_EMPTY) return; // jichi 10/24/2014: dummy hook only for dynamic hook
if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp))
hp.hook_fun = nullptr;
if (dwType & HOOK_EMPTY) // jichi 10/24/2014: dummy hook only for dynamic hook dwCount = 0;
return 0; dwSplit = 0;
dwDataIn = *(DWORD *)(dwDataBase + hp.offset); // default value
dwCount = 0; if (hp.text_fun) {
dwSplit = 0; hp.text_fun(dwDataBase, &hp, 0, &dwDataIn, &dwSplit, &dwCount);
dwDataIn = *(DWORD *)(dwDataBase + hp.offset); // default value }
else {
if (hp.text_fun) { if (dwDataIn == 0)
hp.text_fun(dwDataBase, &hp, 0, &dwDataIn, &dwSplit, &dwCount); return;
} if (dwType & FIXING_SPLIT)
else { dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating
if (dwDataIn == 0) else if (dwType & USING_SPLIT) {
return 0; dwSplit = *(DWORD *)(dwDataBase + hp.split);
if (dwType & FIXING_SPLIT) if (dwType & SPLIT_INDIRECT) {
dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating if (IthGetMemoryRange((LPVOID)(dwSplit + hp.split_index), 0, 0)) dwSplit = *(DWORD *)(dwSplit + hp.split_index);
else if (dwType & USING_SPLIT) { else return;
dwSplit = *(DWORD *)(dwDataBase + hp.split); }
if (dwType & SPLIT_INDIRECT) {
if (IthGetMemoryRange((LPVOID)(dwSplit + hp.split_index), 0, 0))
dwSplit = *(DWORD *)(dwSplit + hp.split_index);
else
return 0;
} }
if (dwType & DATA_INDIRECT) {
if (IthGetMemoryRange((LPVOID)(dwDataIn + hp.index), 0, 0)) dwDataIn = *(DWORD *)(dwDataIn + hp.index);
else return;
}
dwCount = GetLength(dwDataBase, dwDataIn);
} }
if (dwType & DATA_INDIRECT) { // jichi 12/25/2013: validate data size
if (IthGetMemoryRange((LPVOID)(dwDataIn + hp.index), 0, 0)) if (dwCount == 0 || dwCount > PIPE_BUFFER_SIZE - sizeof(ThreadParam)) return;
dwDataIn = *(DWORD *)(dwDataIn + hp.index);
else if (hp.length_offset == 1) {
return 0; dwDataIn &= 0xffff;
if ((dwType & BIG_ENDIAN) && (dwDataIn >> 8))
dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
if (dwCount == 1)
dwDataIn &= 0xff;
*(WORD *)(pbData + sizeof(ThreadParam)) = dwDataIn & 0xffff;
}
else
::memcpy(pbData + sizeof(ThreadParam), (void *)dwDataIn, dwCount);
// jichi 10/14/2014: Add filter function
if (hp.filter_fun && !hp.filter_fun(pbData + sizeof(ThreadParam), &dwCount, &hp, 0) || dwCount <= 0) return;
if (dwType & (NO_CONTEXT | FIXING_SPLIT))
dwRetn = 0;
*(ThreadParam*)pbData = { GetCurrentProcessId(), dwAddr, dwRetn, dwSplit };
if (dwCount) {
DWORD unused;
//CliLockPipe();
WriteFile(::hookPipe, pbData, dwCount + sizeof(ThreadParam), &unused, nullptr);
//CliUnlockPipe();
} }
dwCount = GetLength(dwDataBase, dwDataIn);
} }
// jichi 12/25/2013: validate data size __except (EXCEPTION_EXECUTE_HANDLER)
if (dwCount == 0 || dwCount > PIPE_BUFFER_SIZE - sizeof(ThreadParam)) {
return 0; ConsoleOutput("Textractor: Send ERROR (likely an incorrect H-code)");
if (hp.length_offset == 1) {
dwDataIn &= 0xffff;
if ((dwType & BIG_ENDIAN) && (dwDataIn >> 8))
dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
if (dwCount == 1)
dwDataIn &= 0xff;
*(WORD *)(pbData + sizeof(ThreadParam)) = dwDataIn & 0xffff;
} }
else
::memcpy(pbData + sizeof(ThreadParam), (void *)dwDataIn, dwCount);
// jichi 10/14/2014: Add filter function
if (hp.filter_fun && !hp.filter_fun(pbData + sizeof(ThreadParam), &dwCount, &hp, 0) || dwCount <= 0) {
return 0;
}
if (dwType & (NO_CONTEXT | FIXING_SPLIT))
dwRetn = 0;
*(ThreadParam*)pbData = { GetCurrentProcessId(), dwAddr, dwRetn, dwSplit };
if (dwCount) {
DWORD unused;
//CliLockPipe();
WriteFile(::hookPipe, pbData, dwCount + sizeof(ThreadParam), &unused, nullptr);
//CliUnlockPipe();
}
return 0;
} }
bool TextHook::InsertHookCode() bool TextHook::InsertHookCode()
@ -226,9 +201,9 @@ bool TextHook::InsertHookCode()
if (hp.type & MODULE_OFFSET) // Map hook offset to real address if (hp.type & MODULE_OFFSET) // Map hook offset to real address
if (hp.type & FUNCTION_OFFSET) if (hp.type & FUNCTION_OFFSET)
if (FARPROC function = GetProcAddress(GetModuleHandleW(hp.module), hp.function)) hp.insertion_address += (uint64_t)function; if (FARPROC function = GetProcAddress(GetModuleHandleW(hp.module), hp.function)) hp.insertion_address += (uint64_t)function;
else return ConsoleOutput("Textractor: UnsafeInsertHookCode: FAILED: function not present"), false; else return ConsoleOutput("Textractor: InsertHookCode FAILED: function not present"), false;
else if (HMODULE moduleBase = GetModuleHandleW(hp.module)) hp.insertion_address += (uint64_t)moduleBase; else if (HMODULE moduleBase = GetModuleHandleW(hp.module)) hp.insertion_address += (uint64_t)moduleBase;
else return ConsoleOutput("Textractor: UnsafeInsertHookCode: FAILED: module not present"), false; else return ConsoleOutput("Textractor: InsertHookCode FAILED: module not present"), false;
BYTE* original; BYTE* original;
insert: insert:
@ -240,18 +215,15 @@ insert:
} }
else else
{ {
ConsoleOutput(("Textractor: UnsafeInsertHookCode: FAILED: error " + std::string(MH_StatusToString(err))).c_str()); ConsoleOutput(("Textractor: InsertHookCode FAILED: error " + std::string(MH_StatusToString(err))).c_str());
return false; return false;
} }
void* thisPtr = (void*)this;
void* funcPtr = (void*)((BYTE*)ProcessHook - (BYTE*)(trampoline + 19)); *(TextHook**)(common_hook + 9) = this;
DWORD dist = original - (trampoline + sizeof(common_hook)) - 4; *(void(TextHook::**)(DWORD))(common_hook + 14) = &TextHook::Send;
*(BYTE**)(common_hook + 24) = original;
memcpy(trampoline, common_hook, sizeof(common_hook)); memcpy(trampoline, common_hook, sizeof(common_hook));
memcpy(trampoline + 10, &thisPtr, sizeof(void*));
memcpy(trampoline + 15, &funcPtr, sizeof(void*));
memcpy(trampoline + sizeof(common_hook), &dist, sizeof(dist));
//BYTE* original; //BYTE* original;
//MH_CreateHook((void*)hp.address, (void*)trampoline, (void**)&original); //MH_CreateHook((void*)hp.address, (void*)trampoline, (void**)&original);
@ -274,41 +246,38 @@ DWORD WINAPI ReaderThread(LPVOID hookPtr)
BYTE buffer[PIPE_BUFFER_SIZE] = {}; BYTE buffer[PIPE_BUFFER_SIZE] = {};
unsigned int changeCount = 0; unsigned int changeCount = 0;
int dataLen = 0; int dataLen = 0;
const void* currentAddress = (void*)hook->hp.insertion_address; __try
while (true)
{ {
if (!IthGetMemoryRange((void*)hook->hp.insertion_address, nullptr, nullptr)) const void* currentAddress = (void*)hook->hp.insertion_address;
while (true)
{ {
ConsoleOutput("Textractor: can't read desired address"); if (hook->hp.type & DATA_INDIRECT) currentAddress = *((char**)hook->hp.insertion_address + hook->hp.index);
break; Sleep(500);
} if (memcmp(buffer + sizeof(ThreadParam), currentAddress, dataLen + 1) == 0)
if (hook->hp.type & DATA_INDIRECT) currentAddress = *((char**)hook->hp.insertion_address + hook->hp.index); {
if (!IthGetMemoryRange(currentAddress, nullptr, nullptr)) changeCount = 0;
{ continue;
ConsoleOutput("Textractor: can't read desired address"); }
break; if (++changeCount > 10)
} {
Sleep(500); ConsoleOutput("Textractor: memory constantly changing, useless to read");
if (memcmp(buffer + sizeof(ThreadParam), currentAddress, dataLen + 1) == 0) break;
{ }
changeCount = 0;
continue;
}
if (++changeCount > 10)
{
ConsoleOutput("Textractor: memory constantly changing, useless to read");
break;
}
if (hook->hp.type & USING_UNICODE) if (hook->hp.type & USING_UNICODE)
dataLen = wcslen((const wchar_t*)currentAddress) * 2; dataLen = wcslen((const wchar_t*)currentAddress) * 2;
else else
dataLen = strlen((const char*)currentAddress); dataLen = strlen((const char*)currentAddress);
*(ThreadParam*)buffer = { GetCurrentProcessId(), hook->hp.insertion_address, 0, 0 }; *(ThreadParam*)buffer = { GetCurrentProcessId(), hook->hp.insertion_address, 0, 0 };
memcpy(buffer + sizeof(ThreadParam), currentAddress, dataLen + 1); memcpy(buffer + sizeof(ThreadParam), currentAddress, dataLen + 1);
DWORD unused; DWORD unused;
WriteFile(::hookPipe, buffer, dataLen + sizeof(ThreadParam), &unused, nullptr); WriteFile(::hookPipe, buffer, dataLen + sizeof(ThreadParam), &unused, nullptr);
}
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
ConsoleOutput("Textractor: ReaderThread ERROR (likely an incorrect R-code)");
} }
ConsoleOutput("Textractor: remove read code"); ConsoleOutput("Textractor: remove read code");
hook->ClearHook(); hook->ClearHook();

3
vnrhook/hijack/texthook.h
View File

@ -20,7 +20,6 @@ class TextHook
{ {
bool InsertHookCode(); bool InsertHookCode();
bool InsertReadCode(); bool InsertReadCode();
DWORD UnsafeSend(DWORD dwDataBase, DWORD dwRetn);
int GetLength(DWORD base, DWORD in); // jichi 12/25/2013: Return 0 if failed int GetLength(DWORD base, DWORD in); // jichi 12/25/2013: Return 0 if failed
void RemoveHookCode(); void RemoveHookCode();
void RemoveReadCode(); void RemoveReadCode();
@ -32,7 +31,7 @@ public:
bool InsertHook(); bool InsertHook();
void InitHook(const HookParam &hp, LPCSTR name, DWORD set_flag); void InitHook(const HookParam &hp, LPCSTR name, DWORD set_flag);
DWORD Send(DWORD dwDataBase, DWORD dwRetn); void Send(DWORD dwDataBase);
void ClearHook(); void ClearHook();
}; };