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improve IAT hooks

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This commit is contained in:
FunkyFr3sh 2021-09-04 06:24:43 +02:00
parent 50adf5d46e
commit b279fefa88
1 changed files with 115 additions and 4 deletions
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119
src/hook.c
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@ -117,8 +117,117 @@ void hook_patch_iat(HMODULE hmod, BOOL unhook, char* module_name, char* function
hook_patch_iat_list(hmod, unhook, (HOOKLIST*)&hooks);
}
void hook_patch_obfuscated_iat_list(HMODULE hmod, BOOL unhook, HOOKLIST* hooks)
{
if (!hmod || hmod == INVALID_HANDLE_VALUE || !hooks)
return;
#ifdef _MSC_VER
__try
{
#endif
PIMAGE_DOS_HEADER dos_header = (PIMAGE_DOS_HEADER)hmod;
if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
return;
PIMAGE_NT_HEADERS nt_headers = (PIMAGE_NT_HEADERS)((DWORD)dos_header + (DWORD)dos_header->e_lfanew);
if (nt_headers->Signature != IMAGE_NT_SIGNATURE)
return;
PIMAGE_IMPORT_DESCRIPTOR import_desc = (PIMAGE_IMPORT_DESCRIPTOR)((DWORD)dos_header +
(DWORD)(nt_headers->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress));
if (import_desc == (PIMAGE_IMPORT_DESCRIPTOR)nt_headers)
return;
while (import_desc->FirstThunk)
{
for (int i = 0; hooks[i].module_name[0]; i++)
{
char* imp_module_name = (char*)((DWORD)dos_header + (DWORD)(import_desc->Name));
if (_stricmp(imp_module_name, hooks[i].module_name) == 0)
{
PIMAGE_THUNK_DATA first_thunk =
(PIMAGE_THUNK_DATA)((DWORD)dos_header + (DWORD)import_desc->FirstThunk);
PIMAGE_THUNK_DATA original_first_thunk =
(PIMAGE_THUNK_DATA)((DWORD)dos_header + (DWORD)import_desc->OriginalFirstThunk);
while (first_thunk->u1.Function)
{
for (int x = 0; hooks[i].data[x].function_name[0]; x++)
{
DWORD org_function =
(DWORD)GetProcAddress(
GetModuleHandle(hooks[i].module_name),
hooks[i].data[x].function_name);
if ((!unhook && !hooks[i].data[x].new_function) || !org_function)
continue;
if (unhook)
{
if (first_thunk->u1.Function == (DWORD)hooks[i].data[x].new_function)
{
DWORD op;
if (VirtualProtect(
&first_thunk->u1.Function,
sizeof(DWORD),
PAGE_READWRITE,
&op))
{
first_thunk->u1.Function = org_function;
VirtualProtect(&first_thunk->u1.Function, sizeof(DWORD), op, &op);
}
break;
}
}
else
{
if (first_thunk->u1.Function == org_function)
{
DWORD op;
if (VirtualProtect(
&first_thunk->u1.Function,
sizeof(DWORD),
PAGE_READWRITE,
&op))
{
first_thunk->u1.Function = (DWORD)hooks[i].data[x].new_function;
VirtualProtect(&first_thunk->u1.Function, sizeof(DWORD), op, &op);
}
break;
}
}
}
first_thunk++;
original_first_thunk++;
}
}
}
import_desc++;
}
#ifdef _MSC_VER
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
}
#endif
}
void hook_patch_iat_list(HMODULE hmod, BOOL unhook, HOOKLIST* hooks)
{
hook_patch_obfuscated_iat_list(hmod, unhook, hooks);
if (!hmod || hmod == INVALID_HANDLE_VALUE || !hooks)
return;
@ -168,10 +277,13 @@ void hook_patch_iat_list(HMODULE hmod, BOOL unhook, HOOKLIST* hooks)
if (_stricmp((const char*)import->Name, hooks[i].data[x].function_name) == 0)
{
DWORD old_protect;
DWORD op;
if (VirtualProtect(
&first_thunk->u1.Function, sizeof(DWORD), PAGE_READWRITE, &old_protect))
&first_thunk->u1.Function,
sizeof(DWORD),
PAGE_READWRITE,
&op))
{
if (unhook)
{
@ -190,8 +302,7 @@ void hook_patch_iat_list(HMODULE hmod, BOOL unhook, HOOKLIST* hooks)
first_thunk->u1.Function = (DWORD)hooks[i].data[x].new_function;
}
VirtualProtect(
&first_thunk->u1.Function, sizeof(DWORD), old_protect, &old_protect);
VirtualProtect(&first_thunk->u1.Function, sizeof(DWORD), op, &op);
}
break;