KRBTGT is a default account that exists in all domains of an Active Directory. Its purpose is to act as a KDC (Key Distribution Centre) service account for domain controllers.
When a user wishes to authenticate through Kerberos, they first obtain a TGT ticket which is signed with a key derived from the password of the KRBTGT account. This feature makes this account a critical element, as knowledge of its password would allow a malicious actor to forge arbitrary tickets, better known as Golden Tickets
Cybersecurity articles related to KRBTG
Here are some technical articles on cybersecurity related to KRBTG that have been published on Tarlogic’s website.