Kerberoast
Within Kerberos we have the curious case of the Service Account. The article as follows is built from a number of resources, so as is fair I will be referencing as I go through to try and give as broad an overview of the topic as I can.
https://github.com/nidem/kerberoast
https://adsecurity.org/?p=1508
https://adsecurity.org/?tag=kerberoast
https://blog.stealthbits.com/discovering-service-accounts-without-using-privileges/