OD/CE 过掉TMD壳附加检查

chc2203

恢复OD进程附加原理


1、恢复DbgBreakPoint和DbgUiRemoteBreakin被HOOK代码


//由于我是使用ntdll SDK,可直接使用NTDLL中的API,如果你们不能使用,直接用GetProcAddress获取API

注意该处的修复,自己可以写个HOOK，放到LoadLibrary，每次加载DLL时候，就处理一次,防止某些DLL还有TMD壳，又会被恢复

ntdll->DbgBreakPoint 被TMD壳修改为retn
-> 0xC3


DWORD lpflOldProtect;
LPVOID ulAddress
= DbgBreakPoint;
VirtualProtect(ulAddress,1,PAGE_EXECUTE_READWRITE,&lpflOldProtect);

*(BYTE*)(ulAddress) =
0xCC;


ntdll->DbgUiRemoteBreakin 被TMD修改为JMP LdrShutdownProcess

ulAddress = DbgUiRemoteBreakin

VirtualProtect(ulAddress,1,PAGE_EXECUTE_READWRITE,&lpProtect);
*(BYTE*)(ulAddress) =
0x6A;
*(DWORD*)((BYTE*)ulAddress+1)= 0xFC686808;

2、修复允许CE的附加

第一步虽然修复了允许附加,但TMD壳本身还自带线程检查ANTI，所以我们要终止掉这些线程


BOOL WINAPI _AhnHS_GetThreadModuleName(char* szModuleName,DWORD szThreadId,LPVOID & StartAddress,HANDLE & hThread)
{
hThread  = OpenThread(THREAD_ALL_ACCESS, FALSE, szThreadId);


if (!hThread) return FALSE;


LONG status
= ZwQueryInformationThread(hThread, ThreadQuerySetWin32StartAddress, &StartAddress, sizeof(StartAddress), NULL);
if(status <0)
{
CloseHandle(hThread);
SetLastError(RtlNtStatusToDosError(status));
return FALSE;
}


return (GetMappedFileNameA(GetCurrentProcess(), StartAddress, szModuleName, MAX_PATH)>=0) ? TRUE : FALSE;
}

void WINAPI _AhnHS_PassThreadByTMD()
{
HANDLE hThreadSnap , hThread;
THREADENTRY32 te32
= {0};
CONTEXT    context
= {0};


hThreadSnap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if ( hThreadSnap == INVALID_HANDLE_VALUE )
return;


memset(&te32, 0, sizeof(THREADENTRY32));
te32.dwSize  = sizeof(THREADENTRY32);


BOOL dwRet
= Thread32First(hThreadSnap, &te32);
DWORD dwCurrentProcessId
= GetCurrentProcessId();


do
{
if (te32.th32OwnerProcessID != dwCurrentProcessId) continue;


char szModuleFileName[MAX_PATH];
LPVOID  StartAddress;


if(!_AhnHS_GetThreadModuleName(szModuleFileName,te32.th32ThreadID,StartAddress,hThread)) continue;


char* pszName
= (strrchr(szModuleFileName,'\\')) ? strrchr(szModuleFileName,'\\')+1 : szModuleFileName;


//AntiHookGetMainThreadId()=主线程ID，可自行修改


if(lstrcmpiA(pszName,AntiHookGetModuleInfo()->AppName)==0 && AntiHookGetMainThreadId()!=te32.th32ThreadID)
{
//远程线程非代码块,为其它检查线程，终止
HMODULE  lib = GetModuleHandleA(pszName);
PIMAGE_NT_HEADERS
nth =  PIMAGE_NT_HEADERS(PBYTE(lib) + PIMAGE_DOS_HEADER(lib)->e_lfanew);
IMAGE_SECTION_HEADER
*pSection =
(IMAGE_SECTION_HEADER*)((DWORD)nth + sizeof(IMAGE_NT_HEADERS));

if((DWORD)StartAddress>(pSection[0].VirtualAddress+(DWORD)lib) && (DWORD)StartAddress<pSection[1].VirtualAddress+(DWORD)lib) continue;

TerminateThread(hThread,0);
}

CloseHandle(hThread);

}while(Thread32Next(hThreadSnap, &te32));


CloseHandle(hThreadSnap);
}

OK，万事大吉，世界清静了

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