An attack that abuses the Microsoft Replication Service protocol to extract password hashes from a domain controller — without ever logging on to it.
Any principal with Replicating Directory Changes + Replicating Directory Changes All rights can DCSync. Tools: Mimikatz lsadump::dcsync, secretsdump.py. Defence: audit DS-Replication-Get-Changes ACL holders and alert on DRSUAPI from non-DC sources.
See our web application penetration testing, API security testing, network penetration testing, and cloud security audit services for how we test for and defend against this class of issue.
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