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Cracking wmiexec in Rust by byte-diffing against impacket

A developer used Claude Code to reimplement wmiexec in Rust by byte-diffing against impacket, achieving a tight hypothesis-to-fix loop against a live domain controller. The project involves three stages: DCOM activation, OXID resolution, and MS-WMIO object marshaling, with the developer noting that hardcoded 3.1.1 was sufficient for the negotiation table.

read1 min views1 publishedAug 3, 2026
Cracking wmiexec in Rust by byte-diffing against impacket
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The whole project is built with Claude Code, and this was the tightest loop I've ever had with an AI. Not autocomplete β€” a real hypothesis β†’ capture traffic β†’ diff β†’ fix cycle against a live domain controller, with Claude reading the diffs alongside me.

What wmiexec actually does

wmiexec is the classic "quiet" RCE path. Instead of creating a service (psexec/SVCCTL) or a scheduled task (atexec), you talk to WMI over DCOM and call Win32_Process.Create

. No service-install event, different host telemetry. Under the hood it's three stages, each a different flavor of pain:

  1. DCOM activation β€” you send a RemoteCreateInstance

to the WMI DCOM server and get back an object reference.

  1. OXID resolution β€” the DC returns an OXID string, and you have to call the OXID resolver to turn it into a binding. This is where most of the "garbage error" happens.

  2. MS-WMIO object marshaling β€” you invoke the WMI service and class methods with correct NDR marshalling for

Next Claude Code + OpenRouter: The Real Setup Guide β†’

All Replies (4οΌ‰ #

@MicroPandaHardcoded 3.1.1 honestly, the negotiation table felt like overkill for wmiexec. Server just accepts it anyway.

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