Reg Add Hkcu Software Classes Clsid 86ca1aa034aa4e8ba50950c905bae2a2 Inprocserver32 F Ve -

Your command uses HKCU (HKEY_CURRENT_USER), which affects only the current user’s session. This is safer than HKLM (local machine) because it doesn’t require administrator rights, but it also means the change won’t affect other users.

Here is a corrected and complete version of the command you referenced:

reg add "HKCU\Software\Classes\CLSID\86CA1AA0-34AA-4E8B-A509-50C905BAE2A2\InProcServer32" /ve /t REG_SZ /d "C:\Windows\System32\my_example.dll" /f

Note: The CLSID must be in standard GUID format with braces and hyphens. Your original 86ca1aa034aa4e8ba50950c905bae2a2 is valid but missing hyphens and braces – Windows expects 86CA1AA0-34AA-4E8B-A509-50C905BAE2A2. Note: The CLSID must be in standard GUID

Registry-only persistence (no new file in startup folder) often evades simple antivirus scans. By the time you see the reg add command in logs, the malware may already be active.

Attackers don’t need to add a Run key. They wait for any application to instantiate a specific CLSID — sometimes one used by Explorer, Office, or browsers. Every time that COM object is called, the malware runs. Attackers don’t need to add a Run key

| Mistake | Consequence | |---------|-------------| | Missing braces or hyphens in CLSID | Command fails with “invalid syntax” | | Forgetting quotes around paths with spaces | Only part of the path is written | | No /f flag | Command prompts for confirmation (not an error, but may hang scripts) | | Missing /t REG_SZ | Default type is REG_SZ, but explicit is safer |

reg delete HKCU\Software\Classes\CLSID\86ca1aa0-34aa-4e8b-a509-50c905bae2a2 /f

Also consider deleting the referenced DLL after verifying it is not a legitimate Windows file. since it’s empty

Normally, InprocServer32’s default value should contain the full path to a DLL that implements the COM object. Here, since it’s empty, any attempt to instantiate that CLSID would fail (or fall back to other registration).