Reg Add Hkcu Software Classes Clsid 86ca1aa034aa4e8ba50950c905bae2a2 Inprocserver32 Ve D F Portable May 2026

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reg add hkcu software classes clsid 86ca1aa034aa4e8ba50950c905bae2a2 inprocserver32 ve d f portable

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Abstract

This paper analyzes the command reg add HKCU\Software\Classes\CLSID\86CA1AA0-34AA-4e8b-A509-50C905BAE2A2\InprocServer32 with flags /ve, /d, and /f, often used in Windows environments to modify the default value of an InprocServer32 subkey. Such modifications can redirect COM object instantiation to an arbitrary DLL, enabling persistence, privilege escalation, or malware execution. This study explains the syntax, registry paths, security risks, and detection methods.

Part 1: Anatomy of the reg add Command

The reg add command is a built-in Windows tool for modifying the registry via command line. Its structure is: Abstract This paper analyzes the command reg add

reg add <KeyPath> /v <ValueName> /t <Type> /d <Data> /f

A malicious actor targeting InprocServer32 would write:

reg add "HKCU\Software\Classes\CLSID\MALICIOUS-CLSID\InprocServer32" /ve /t REG_SZ /d "C:\Windows\Temp\bad.dll" /f

Breaking it down:

• HKCU → Current user hive (no admin rights needed).
• InprocServer32 → Tells Windows this is an in-process COM server (a DLL).
• /ve → Modifies the "(Default)" value.
• /d → Path to the attacker's DLL.
• /f → Silent overwrite.

Then this would:

• Add a registry key under Current User (HKCU) — no admin rights needed.
• Set the default value (named (Default) — that’s what /ve does) to a DLL path.
• Register that DLL as a COM in-process server.

Attackers use this to:

• Make a malicious DLL load when any app tries to use that CLSID.
• Bypass antivirus because the DLL is loaded inside a trusted process.