Windows 10: Windows apps forget credentials that have been specified to them

Michael in Paris · Aug 21, 2020

Hello all,

I am using Windows 10 Pro on a fast PC. As of a few days ago, I noticed that the browser I used - Opera - had started "forgetting" login/passwd info to sites I had accessed until now without having to reenter the info. As I failed fixing this, I moved to Edge, but it also suffers from the same problem: not sure when it happens - I enter credentials for a few sites, use them, close Edge, reopen again, and those credentials may still work or have disappeared. I also noticed that another app - OpenVPN - had "forgotten" the password it used to remember in order for me to log to a remote network. This is a recent problem - from a few days ago.

The only recent changes to my PC that I can think of were two: some automatic system update, and a warning from Microsoft about the integrity of my Hotmail mailbox - following which I changed its password. I changed it in the Windows accounts, but regularly there are notifications mainly from the Calendar - if that's the name of the app, my system is French that this account is "obsolete", so I click to fix it, and it says it's fixed. And it recurs sometimes later.

I tried for hours to find on the web anything about it, to no avail. I ran DISM which didn't find any problem and SFC whose log said it found problems and fixed them, but nothing changed.

I ended up caling today Windows Support to which I had subscribed a few months ago, talked to 4 people. Two of them launched a Windows reinstall with my files and parameters kept which lasted 1.5 hour each time, but that didn't change the situation.

Any suggestions as to what I could do to fix this annoying problem would be very welcome.

Thanks,
Michael

:)

Ryan Fra · Aug 21, 2020

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.

Brink · Aug 21, 2020

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

Carlos Tin · Aug 21, 2020

Network Credentials

Hi Sammy,

To assist you better regarding your concern with network credentials, have you checked the Windows credentials for any information about the username and password for the network credentials? If not yet, follow the steps below to access Windows Credentials
manager.

Press the Windows icon on the desktop.

Type in Windows Credentials.

We would appreciate as well if you could provide us a screenshot.

Let us know how it goes.

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