Windows 10: Windows security- Credentials ???

TS Bahama · Sep 14, 2018

We have a NAS network that we work through via a D-Link that connects 5 computers. Recently we're having a problem where all of a sudden, we are UNABLE to access our network (it asks us for our credentials).

When we enter out credentials (which have never been changed & are correct), it won't let us into our Nas network.- We know the NAS is not faulty, and neither is the D-link because we can still connect to the internet (via D-link) and it's not all computers at the same time.

Strange thing is that it sometimes lets us in the network & sometimes not, kind of like a lucky packet. Sometimes it's computer 1 & tomorrow it might be computer 2, sometimes it'll let me in 2 hours later etc etc.
So we figured its the computer settings itself, MAYBE WINDOWS or it's SECURITY settings.

HELP !!!!

:)

Brink · Sep 14, 2018

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

Ryan Fra · Sep 14, 2018

Windows Network Credentials

Hi Keith,

We suggest that you disable Credential Manager before mapping your Drives. Please follow these steps to disable Credential Manager:

In the search box type “Services”

Right click on “Services” and select “Run as Administrator”

In the Services Window, look for Credential Manager Service and click “Stop”.

Restart the computer and go back the Credential Manager Service and set it to “Automatic”.

Restart the computer again.

Please keep us updated if you were able to map your drives.

Divya Murugan · Sep 14, 2018

Microsoft security notification

Hi Maria,

Thank you for posting your query on Microsoft Community.

I appreciate your interest in Windows 10.We sincerely regret for the inconvenience caused.

Are you logged in using Microsoft account on the desktop?

You might be face this issue if the Windows login credentials are removed from the Login Credential manger.

I suggest you to try the following steps and check if it helps.

a. Press Start button and type "Credential Manager".

b. Click on the arrow near the "Windows cached credentials".

c. Check whether the Windows login credentials are listed over there.

d. If the credentials are listed, I suggest you to click on "Remove from vault" and follow the onscreen suggestions.

e. Now check for the issue.

Please let us know if you need further assistance.

Thank you.

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