What is DCSync and what is its primary use in domain penetration?

DCSync is a feature in mimikatz that exploits the Directory Replication Service (DRS) protocol to replicate user credentials from a domain controller, allowing an attacker to export hashes of all domain users. It requires permissions like Domain Admins or a domain controller's computer account. For details, see [Domain Penetration - DCSync](/news/domain-penetration-dcsync).