TASK 1: CREATE A GPO: DISABLE LOCAL LINK MULTICAST NAME RESOLUTION (LLMNR)
For this first task, you will investigate and mitigate one of the attack vectors that exists within a Windows domain.

Read about LLMNR vulnerabilities in the the MITRE ATT&CK database.

MITRE is one of the world’s leading organizations for threat intelligence in cybersecurity.
MITRE maintains the Common Vulnerabilities and Exposures database, which catalogs officially known exploits.
It also maintains this MITRE ATT&CK database, which catalogs attack methods and signatures of known hacking groups.

Local Link Multicast Name Resolution (LLMNR) is a vulnerability, so we will be disabling it on our Windows 10 machine (via the GC Computers OU).
A few notes about LLMNR:

LLMNR is a protocol used as a backup (not an alternative) for DNS in Windows.
When Windows cannot find a local address (e.g. the location of a file server), it uses LLMNR to send out a broadcast across the network asking if any device knows the address.
LLMNR’s vulnerability is that it accepts any response as authentic, allowing attackers to poison or spoof LLMNR responses, forcing devices to authenticate to them.
An LLMNR-enabled Windows machine may automatically trust responses from anyone in the network.

Turning off LLMNR for the GC Computers OU will prevent our Windows machine from trusting location responses from potential attackers.

INSTRUCTIONS
Since this task deals with Active Directory Group Policy Objects, you’ll be working in your nested Windows Servermachine.
Create a Group Policy Object that prevents your domain-joined Windows machine from using LLMNR:

On the top-right of the Server Manager screen, open the Group Policy Management tool to create a new GPO.
Right-click Group Policy Objects and select New.
Name the Group Policy Object No LLMNR.
Right-click the new No LLMNR GPO listing and select Edit to open the Group Policy Management Editor and find policies.
In the Group Policy Management Editor, the policy you are looking for is at the following path: Computer ConfigurationPoliciesAdministrative TemplatesNetworkDNS Client.

Find the policy called Turn Off Multicast Name Resolution.
Enable this policy.

Exit the Group Policy Management Editor and link the GPO to the GC Computers organizational unit you previously created.
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