BHO object won't load, probable registration trouble? - bho

Question

I can't get Internet Explorer or Windows Explorer to load this BHO. Sure there's no COM objects that can be created, but Explorer can't know that until it loads the DLL and checks, but LoadLibrary isn't getting called.
The message box shows when I run regsvr32.
Windows Version = 8.1
Internet Epxlorer Version = 11
Enhance Protected Mode on or off doesn't seem to make a difference.
#include <windows.h>
#include <olectl.h>
#include <stddef.h>
#include <string.h>
#define wstrlen wcslen
HINSTANCE me;
DWORD WINAPI M4(void *junk)
{
MessageBox(NULL, "Loaded", "bho", 0);
}
BOOL WINAPI DllMain(HINSTANCE hInstDll, DWORD fdwReason, LPVOID lpReserved)
{
wchar_t mainexe[1024];
if (fdwReason == DLL_PROCESS_ATTACH) {
me = hInstDll;
DisableThreadLibraryCalls(me);
/* GetModuleFileNameW(NULL, mainexe, 1024); */
/* len = wstrlen(mainexe); */
HANDLE th = CreateThread(NULL, 32768, M4, NULL, 0, NULL);
}
return TRUE;
}
STDAPI DllGetClassObject(REFIID rclsid,REFIID riid,LPVOID *ppv)
{
return CLASS_E_CLASSNOTAVAILABLE;
}
STDAPI DllCanUnloadNow()
{
return FALSE;
}
const char *CLSID_NAME = "CLSID\\{2D3E480A-0000-0000-0000-64756D796C6472}";
const char *CLSID_IPS32 = "CLSID\\{2D3E480A-0000-0000-0000-64756D796C6472}\\InProcServer32";
const char *BHO = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Browser Helper Objects\\{2D3E480A-0000-0000-0000-64756D796C6472}";
const wchar_t *name = L"Redacted BHO";
const char *apt = "Apartment";
STDAPI DllRegisterServer()
{
HKEY hk;
wchar_t dllpath[1024];
GetModuleFileNameW(me,dllpath,1024);
if (RegCreateKeyEx(HKEY_CLASSES_ROOT, CLSID_NAME, 0, NULL, 0, KEY_ALL_ACCESS, NULL, &hk, NULL) != ERROR_SUCCESS)
return SELFREG_E_CLASS;
RegSetValueExW(hk, NULL, 0, REG_SZ, (const BYTE *)(name), (wstrlen(name) + 1) << 1);
RegCloseKey(hk);
if (RegCreateKeyEx(HKEY_CLASSES_ROOT, CLSID_IPS32, 0, NULL, 0, KEY_ALL_ACCESS, NULL, &hk, NULL) != ERROR_SUCCESS)
return SELFREG_E_CLASS;
RegSetValueExW(hk, NULL, 0, REG_SZ, (const BYTE *)(dllpath), (wstrlen(dllpath) + 1) << 1);
RegSetValueEx(hk, "ThreadingModel", 0, REG_SZ, (const BYTE *)(apt), 10);
RegCloseKey(hk);
if (RegCreateKeyEx(HKEY_LOCAL_MACHINE, BHO, 0, NULL, 0, KEY_ALL_ACCESS, NULL, &hk, NULL) != ERROR_SUCCESS)
return SELFREG_E_CLASS;
RegCloseKey(hk);
return S_OK;
}
STDAPI DllUnregisterServer()
{
RegDeleteKey(HKEY_LOCAL_MACHINE, BHO);
RegDeleteKey(HKEY_CLASSES_ROOT, CLSID_IPS32);
RegDeleteKey(HKEY_CLASSES_ROOT, CLSID_NAME);
}

Answer 1

For IE11 in enhanced protected mode (EPM), the registry must be updated with:
HKEY_CLASSES_ROOT\CLSID\{your BHO CLSID}\Implemented
Categories\{59FB2056-D625-48D0-A944-1A85B5AB2640}