WINDOWS ASKING FOR PASSWORD AT BOOT PLUS
WINDOWS ASKING FOR PASSWORD AT BOOT WINDOWS

Step 25 to 36 illustrate the steps to configure credential guard, then verify its status using msinfo32.exe and PowerShell. But using the hash of the LabAdmin, an attacker will be able to do it using the information retrieve from Lsass memory. Open remote PowerShell connection to a domain controllerīoth operations could not be performed by the logon user.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: Pass the hash is a hacking technique that allows an attacker to authenticate by using the underlying NTLM, instead of specifying the user password. The tool has been copied to the lab machines, step 9-13 walk you through the process of dumping lsass memory using Mimikatz. Mimikatz is a popular tool for retrieving lsass memory information. 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. 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. The memory is cleared when the machine starts up.

Lsass.exe is the process which handles user logon, it stores the user credential information in its memory. 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.

Verify the hash in memory is protected using Credential Guard.

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

This lab is structured to cover the following in sequence: The steps are listed in the Content section:

WINDOWS ASKING FOR PASSWORD AT BOOT WINDOWS

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

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

It takes a few minutes to create the VMs, and once it has done, you will see the following machines prepared: This blogpost will walk you through the Credential Guard lab details.Īfter click on the link of Breach Resistance lab, you be required to sign in and then you can launch the lab: There are 3 exercises in the “Implementing Breach Resistance Security in Windows Server 2016”: The link will lead you to a sign up page, after that, you will see the following labs listed for Windows Server 2016: 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. I've forwarded the port to my test server, so you can try to connect to it using \113.178.30.205, although I can't guarantee it will ask you for credentials. Looks like the junk user + password time out after a few days (even if you do check Remember my credentials). After a few days, he suddenly cannot print using the previously added printer, until he tries to connect and provides a random user + password again (the printer does not need to be re-added). After a client provides a random user + password, he can connect to the server and use the shared printer. To make the problem worse, let's say I have a shared printer on the server. Linux clients do not suffer from that issue, at least by using smb://my-server on Ubuntu's Nautilus and select Connect anonymously.

WINDOWS ASKING FOR PASSWORD AT BOOT PLUS

Sometimes I need to type a random user account with a blank password, and sometimes both a random account plus a random password to pass that stupid prompt. It won't connect if I leave all fields blank.

Windows asking for password at boot