Snagging Active Directory credentials over WiFi - Part 1

This issue has been fixed on Windows 8+ as part of MS16-112 issued in September 2016. I haven’t checked this on a Windows 7 machine which isn’t listed on the Microsoft page.

Basics

The basic theory behind the attack is same as @mubix’s discovery - if you connect a network interface to a Windows system and have Responder tool poisoning the network, you can obtain the hashes (NTML responses) from the machine without any user intervention. This works even with the computer in locked state.

In my scenario, I’m using a rogue Open WiFi network to grab the hashes. The result is the same and at times, I had better results than plugging in a Pi Zero. The Responder tool captures the hashes which can then be cracked using tools like hashcat.

Raspberry Pi Zero for credential snagging

Update: CVE-2016-3302 / MS16-112 patch was released by Microsoft to fix the issue.

Introduction

This post is an extension to Rob Fuller’s (@mubix) work - https://room362.com/post/2016/snagging-creds-from-locked-machines/ to see how a Raspberry Pi Zero can be used for credential snagging. All credits go to @mubix for the original research. It is recommended to read mubix’s post (if you haven’t already !) before proceeding.