Windows 10: Credential Guard ON but not working in Hyper V guest.

Omair. · Feb 19, 2023

I am running a Windows Server 2022 Standard Edition Eval Build 20348 in Hyper V on a Windows 11 22H2 host machine. Even after enabling Credential Guard, I can see the NTLM hash. What am I doing wrong?The following is the screenshot from System InformationFrom Device SecurityCore IsolationTask ManagerIf I run mimikatz, I still see the NTLM hash

:)

Brink · Feb 19, 2023

Credential Guard lab companion

If you have heard about Credential Guard in Windows Server 2016 (and in Windows 10), but do not have an environment to try it out, here is a lab environment we built for you to play.

Lab access

The link will lead you to a sign up page, after that, you will see the following labs listed for Windows Server 2016:

Windows Server 2016 labs

There are 3 exercises in the “Implementing Breach Resistance Security in Windows Server 2016”:

Credential Guard

Remote Credential Guard

Device Guard

This blogpost will walk you through the Credential Guard lab details.

After click on the link of Breach Resistance lab, you be required to sign in and then you can launch the lab:

Sign-in

Launch page

It takes a few minutes to create the VMs, and once it has done, you will see the following machines prepared:

Initialize

DC: domain controller, which is not used for this exercise.

SRV01 and SRV02: both are Windows Server 2016, and used for the lab exercise.

Lab exercise – Explained

The steps are listed in the Content section:

Content

This lab is structured to cover the following in sequence:

Understand how attackers can use the hash in memory to gain access to domain controllers

Configure Credential Guard

Verify the hash in memory is protected using Credential Guard

You can follow the steps listed under the content section to complete the lab, the intent of the blog, is to break the procedures into groups, to help you understand the exercise better.

Prep the hash

Lsass.exe is the process which handles user logon, it stores the user credential information in its memory. The memory is cleared when the machine starts up. In this lab environment, all the virtual machines start at the time lab launches, when you logon to the machine, you will only have the logon user credential information in memory. In order to demonstrate an attacker gaining user access using other account’s hash, the first part of the lab is to simulate a server which has been running for a while, different users had remotely or locally connected to it, therefore, lsass memory stored many different user credential information.
This is accomplished by step 1-8.

Retrieving credential hash

Mimikatz is a popular tool for retrieving lsass memory information. The tool has been copied to the lab machines, step 9-13 walk you through the process of dumping lsass memory using Mimikatz.

Pass the Hash

Pass the hash is a hacking technique that allows an attacker to authenticate by using the underlying NTLM, instead of specifying the user password. In step 14 to 24, you will extract LabAdmin hash from lsass using Mimikatz, and use the hash to open a PowerShell console, and perform a couple of operations using the LabAdmin privilege:

Add a user to the domain admin group

Open remote PowerShell connection to a domain controller

Both operations could not be performed by the logon user. But using the hash of the LabAdmin, an attacker will be able to do it using the information retrieve from Lsass memory.

Configure and verify Credential Guard

Step 25 to 36 illustrate the steps to configure credential guard, then verify its status using msinfo32.exe and PowerShell.

Step 37 to 43 goes further to use Mimikatz to show the hash in Lsass is now encrypted using Credential Guard.

More info

The exercise illustrated the benefit of Credential Guard in Windows Server 2016 as well as Windows 10. For more information, you can find here.
Click to expand...

Source: Credential Guard lab companion Datacenter and Private Cloud Security Blog

See also:

Enable or Disable Credential Guard in Windows 10 Windows 10 Security System Tutorials

Verify if Credential Guard is Enabled or Disabled in Windows 10 Windows 10 Security System Tutorials

Abhishekumar.me · Feb 19, 2023

Hyper-V Automatically being shut down randomly by the guest operating system

Hi, lenfant3 follow these steps

In Hyper-V Manager, choose the VM and then "Settings". Click on the Integration Services option and ensure “Operating System Shutdown” is enabled.

Choose "Automatic Stop Action" option under Management.

Choose "Shut down the guest operating system".

joslackMSFT · Feb 19, 2023

Android emulator is incompatiable with Hyper-V in Android Studio (no Hyper-V installed)

If you're running Windows 10 in an enterprise environment, there's a chance the problem could be new "virtualization based security" features in Windows. If Device Guard or Credential Guard are enabled on your machine, that machine is using Hyper-V's hypervisor.

To check if that's the case, follow the instructions on this page or use the Device Guard and Credential Guard hardware readiness tool. Copied and pasted:

Click Start, type msinfo32.exe, and then click System Information.

Click System Summary.

Confirm that Credential Guard is shown next to Device Guard Security Services Running.

Typically, these features are enabled via Group Policy. If that's actually the root cause of the issue, you'll need to work within your organization to opt out of those policies.

One final note -- I do not recommend disabling Intel VT-x (as suggested by Will P), as I believe HAXM (the hypervisor used by the Android emulator) requires VT-x.

Full disclosure -- I work at Microsoft on the Hyper-V team.

Windows 10: Credential Guard ON but not working in Hyper V guest.

Credential Guard ON but not working in Hyper V guest.

Credential Guard ON but not working in Hyper V guest.

Credential Guard ON but not working in Hyper V guest.

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