Forged tickets

Silver, Golden, Diamond and Sapphire tickets are similar variants of forged Kerberos tickets, for different purposes and stealth levels, that can be used with pass-the-ticket to access services in an Active Directory domain.

• When one of krbtgt's Kerberos keys is known, a golden ticket (or diamond, or sapphire) attack can be conducted to keep privileged access until that account's password is changed.

• Let service be an account in charge of various services indicated in its ServicePrincipalNames attribute, when one of service's Kerberos keys is known, a silver ticket attack can be conducted to keep privileged access to those managed services until that account's password is changed.

https://github.com/ShutdownRepo/The-Hacker-Recipes/blob/master/ad/persistence/kerberos/broken-reference/README.md