krbtgtkeys used legitimately for tickets creation, but also for tickets forging by attackers. The consequences of this attack are similar to an NTDS.dit dump and parsing but the practical aspect differ. A DCSync is not a simple copy & parse of the NTDS.dit file, it's a
DsGetNCChangesoperation transported in an RPC request to the DRSUAPI (Directory Replication Service API) to replicate data (including credentials) from a domain controller.
DS-Replication-Get-Changes-All). Members of the Administrators, Domain Admins, Enterprise Admins, and Domain Controllers groups have these privileges by default. In some cases, over-privileged accounts can be abused to grant controlled objects the right to DCSync.
lsadump::dcsyncto operate a DCSync and recover the
krbtgtkeys for a golden ticket attack for example. For this attack to work, the following mimikatz command should run in an elevated context (i.e. through runas with plaintext password, pass-the-hash or pass-the-ticket).