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Golden Ticket Creation:

Kerberos Authentication System: In Windows Active Directory environments, Kerberos is the primary authentication protocol used for network authentication.
Ticket-Granting Ticket (TGT): When a user authenticates to the domain controller (DC), they receive a Ticket-Granting Ticket (TGT), which is a cryptographic token granting access to various network resources.
Ticket-Granting Service (TGS): The TGT can be used to request additional service tickets (TGS) for specific resources within the domain.
Forgery with Mimikatz: An attacker can use tools like Mimikatz to extract the necessary information (such as the NTLM hash of the KRBTGT account, which is the Key Distribution Center Service Account) from memory or Active Directory to forge a TGT.
Ticket Forging: Using the extracted information, the attacker can forge a Golden Ticket by creating a new TGT with arbitrary user credentials, specifying any desired user account, group membership, and desired privileges.
Golden Ticket Attack:

Unrestricted Access: With a forged Golden Ticket, the attacker gains unrestricted access to the domain, essentially granting them the same level of access as a legitimate domain controller.
Persistence: Golden Tickets have a long lifespan (typically 10 years), allowing attackers to maintain persistent access to the network even if passwords are changed or other security measures are implemented.
Stealthy Movement: Since Golden Tickets are signed by the KRBTGT account, they are difficult to detect and are often not logged by standard security monitoring tools.
Access to All Resources: Once the attacker has a Golden Ticket, they can access any network resource, escalate privileges, create backdoors, or perform other malicious activities without being detected.
Mitigation: Mitigating Golden Ticket attacks involves securing the KRBTGT account, implementing strong password policies, monitoring Active Directory for unusual activity, and regularly rotating Kerberos keys.
Overall, Golden Ticket attacks are highly dangerous and can result in severe security breaches if not detected and mitigated promptly.
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