What are the specific registry paths and file naming conventions used for this 64-bit system backdoor?

On 64-bit systems, two registry keys are needed: HKCU\Software\Classes\CLSID\{b5f8350b-0548-48b1-a6ee-88bd00b4a5e7} for 64-bit processes, and HKCU\Software\Classes\Wow6432Node\CLSID\{BCDE0395-E52F-467C-8E3D-C4579291692E} for 32-bit WOW64 processes. The DLLs are stored in %APPDATA%\Microsoft\Installer\{BCDE0395-E52F-467C-8E3D-C4579291692E}\ and named api-ms-win-downlevel-1x64-l1-1-0._dl (64-bit) and api-ms-win-downlevel-1x86-l1-1-0._dl (32-bit). Full details are in the article Use COM Object hijacking to maintain persistence——Hijack CAccPropServicesClass and MMDeviceEnumerator.