PenTest – Active Directory – Enumeration

Using BloodHound

Use the correct collector * AzureHound for Azure Active Directory * SharpHound for local Active Directory * RustHound for local Active Directory

• use BloodHoundAD/AzureHound (more info: Cloud – Azure Pentest)
• use BloodHoundAD/BloodHound

  # run the collector on the machine using SharpHound.exe
  # https://github.com/BloodHoundAD/BloodHound/blob/master/Collectors/SharpHound.exe
  # /usr/lib/bloodhound/resources/app/Collectors/SharpHound.exe
  .\SharpHound.exe -c all -d active.htb --searchforest
  .\SharpHound.exe -c all,GPOLocalGroup # all collection doesn't include GPOLocalGroup by default
  .\SharpHound.exe --CollectionMethod DCOnly # only collect from the DC, doesn't query the computers (more stealthy)
  
  .\SharpHound.exe -c all --LdapUsername <UserName> --LdapPassword <Password> --JSONFolder <PathToFile>
  .\SharpHound.exe -c all --LdapUsername <UserName> --LdapPassword <Password> --domaincontroller 10.10.10.100 -d active.htb
  .\SharpHound.exe -c all,GPOLocalGroup --outputdirectory C:\Windows\Temp --randomizefilenames --prettyjson --nosavecache --encryptzip --collectallproperties --throttle 10000 --jitter 23
  
  # or run the collector on the machine using Powershell
  # https://github.com/BloodHoundAD/BloodHound/blob/master/Collectors/SharpHound.ps1
  # /usr/lib/bloodhound/resources/app/Collectors/SharpHound.ps1
  Invoke-BloodHound -SearchForest -CSVFolder C:\Users\Public
  Invoke-BloodHound -CollectionMethod All  -LDAPUser <UserName> -LDAPPass <Password> -OutputDirectory <PathToFile>
  
  # or remotely via BloodHound Python
  # https://github.com/fox-it/BloodHound.py
  pip install bloodhound
  bloodhound-python -d lab.local -u rsmith -p Winter2017 -gc LAB2008DC01.lab.local -c all
  
  # or locally/remotely from an ADExplorer snapshot from SysInternals (ADExplorer remains a legitimate binary signed by Microsoft, avoiding detection with security solutions)
  # https://github.com/c3c/ADExplorerSnapshot.py
  pip3 install --user .
  ADExplorerSnapshot.py <snapshot path> -o <*.json output folder path>
  

   

• Collect more data for certificates exploitation using Certipy

  certipy find 'corp.local/john:Passw0rd@dc.corp.local' -bloodhound
  certipy find 'corp.local/john:Passw0rd@dc.corp.local' -old-bloodhound
  certipy find 'corp.local/john:Passw0rd@dc.corp.local' -vulnerable -hide-admins -username user@domain -password Password123
  

• use OPENCYBER-FR/RustHound

  # Windows with GSSAPI session
  rusthound.exe -d domain.local --ldapfqdn domain
  # Windows/Linux simple bind connection username:password
  rusthound.exe -d domain.local -u user@domain.local -p Password123 -o output -z
  # Linux with username:password and ADCS module for @ly4k BloodHound version
  rusthound -d domain.local -u 'user@domain.local' -p 'Password123' -o /tmp/adcs --adcs -z
  

Then import the zip/json files into the Neo4J database and query them.

root@payload$ apt install bloodhound 

# start BloodHound and the database
root@payload$ neo4j console
# or use docker
root@payload$ docker run -itd -p 7687:7687 -p 7474:7474 --env NEO4J_AUTH=neo4j/bloodhound -v $(pwd)/neo4j:/data neo4j:4.4-community

root@payload$ ./bloodhound --no-sandbox
Go to http://127.0.0.1:7474, use db:bolt://localhost:7687, user:neo4J, pass:neo4j

NOTE: Currently BloodHound Community Edition is still a work in progress, it is highly recommended to stay on the original BloodHoundAD/BloodHound version.

git clone https://github.com/SpecterOps/BloodHound
cd examples/docker-compose/
cat docker-compose.yml | docker compose -f - up
# UI: http://localhost:8080/ui/login
# Username: admin
# Password: see your Docker logs

You can add some custom queries like : * Bloodhound-Custom-Queries from @hausec * BloodHoundQueries from CompassSecurity * BloodHound Custom Queries from Exegol – @ShutdownRepo * Certipy BloodHound Custom Queries from ly4k

Replace the customqueries.json file located at /home/username/.config/bloodhound/customqueries.json or C:\Users\USERNAME\AppData\Roaming\BloodHound\customqueries.json.

Using PowerView

• Get Current Domain: Get-NetDomain
• Enum Other Domains: Get-NetDomain -Domain <DomainName>
• Get Domain SID: Get-DomainSID
• Get Domain Policy:

  Get-DomainPolicy
  
  #Will show us the policy configurations of the Domain about system access or kerberos
  (Get-DomainPolicy)."system access"
  (Get-DomainPolicy)."kerberos policy"
  

• Get Domain Controlers:

  Get-NetDomainController
  Get-NetDomainController -Domain <DomainName>
  

• Enumerate Domain Users:

  Get-NetUser
  Get-NetUser -SamAccountName <user> 
  Get-NetUser | select cn
  Get-UserProperty
  
  #Check last password change
  Get-UserProperty -Properties pwdlastset
  
  #Get a specific "string" on a user's attribute
  Find-UserField -SearchField Description -SearchTerm "wtver"
  
  #Enumerate user logged on a machine
  Get-NetLoggedon -ComputerName <ComputerName>
  
  #Enumerate Session Information for a machine
  Get-NetSession -ComputerName <ComputerName>
  
  #Enumerate domain machines of the current/specified domain where specific users are logged into
  Find-DomainUserLocation -Domain <DomainName> | Select-Object UserName, SessionFromName
  

• Enum Domain Computers:

  Get-NetComputer -FullData
  Get-DomainGroup
  
  #Enumerate Live machines 
  Get-NetComputer -Ping
  

• Enum Groups and Group Members:

  Get-NetGroupMember -GroupName "<GroupName>" -Domain <DomainName>
  
  #Enumerate the members of a specified group of the domain
  Get-DomainGroup -Identity <GroupName> | Select-Object -ExpandProperty Member
  
  #Returns all GPOs in a domain that modify local group memberships through Restricted Groups or Group Policy Preferences
  Get-DomainGPOLocalGroup | Select-Object GPODisplayName, GroupName
  

• Enumerate Shares

  #Enumerate Domain Shares
  Find-DomainShare
  
  #Enumerate Domain Shares the current user has access
  Find-DomainShare -CheckShareAccess
  

• Enum Group Policies:

  Get-NetGPO
  
  # Shows active Policy on specified machine
  Get-NetGPO -ComputerName <Name of the PC>
  Get-NetGPOGroup
  
  #Get users that are part of a Machine's local Admin group
  Find-GPOComputerAdmin -ComputerName <ComputerName>
  

• Enum OUs:

  Get-NetOU -FullData 
  Get-NetGPO -GPOname <The GUID of the GPO>
  

• Enum ACLs:

  # Returns the ACLs associated with the specified account
  Get-ObjectAcl -SamAccountName <AccountName> -ResolveGUIDs
  Get-ObjectAcl -ADSprefix 'CN=Administrator, CN=Users' -Verbose
  
  #Search for interesting ACEs
  Invoke-ACLScanner -ResolveGUIDs
  
  #Check the ACLs associated with a specified path (e.g smb share)
  Get-PathAcl -Path "\\Path\Of\A\Share"
  

• Enum Domain Trust:

  Get-NetDomainTrust
  Get-NetDomainTrust -Domain <DomainName>
  

• Enum Forest Trust:

  Get-NetForestDomain
  Get-NetForestDomain Forest <ForestName>
  
  #Domains of Forest Enumeration
  Get-NetForestDomain
  Get-NetForestDomain Forest <ForestName>
  
  #Map the Trust of the Forest
  Get-NetForestTrust
  Get-NetDomainTrust -Forest <ForestName>
  

• User Hunting:

  #Finds all machines on the current domain where the current user has local admin access
  Find-LocalAdminAccess -Verbose
  
  #Find local admins on all machines of the domain:
  Invoke-EnumerateLocalAdmin -Verbose
  
  #Find computers were a Domain Admin OR a specified user has a session
  Invoke-UserHunter
  Invoke-UserHunter -GroupName "RDPUsers"
  Invoke-UserHunter -Stealth
  
  #Confirming admin access:
  Invoke-UserHunter -CheckAccess
  

Using AD Module

• Get Current Domain: Get-ADDomain
• Enum Other Domains: Get-ADDomain -Identity <Domain>
• Get Domain SID: Get-DomainSID
• Get Domain Controlers:

Get-ADDomainController
Get-ADDomainController -Identity <DomainName>

• Enumerate Domain Users:

  Get-ADUser -Filter * -Identity <user> -Properties *
  
  #Get a specific "string" on a user's attribute
  Get-ADUser -Filter 'Description -like "*wtver*"' -Properties Description | select Name, Description
  

• Enum Domain Computers:

  Get-ADComputer -Filter * -Properties *
  Get-ADGroup -Filter * 
  

• Enum Domain Trust:

  Get-ADTrust -Filter *
  Get-ADTrust -Identity <DomainName>
  

• Enum Forest Trust:

  Get-ADForest
  Get-ADForest -Identity <ForestName>
  
  #Domains of Forest Enumeration
  (Get-ADForest).Domains
  

• Enum Local AppLocker Effective Policy:

  Get-AppLockerPolicy -Effective | select -ExpandProperty RuleCollections
  

User Hunting

Sometimes you need to find a machine where a specific user is logged in.
You can remotely query every machines on the network to get a list of the users’s sessions.

• CrackMapExec

  cme smb 10.10.10.0/24 -u Administrator -p 'P@ssw0rd' --sessions
  SMB         10.10.10.10    445    WIN-8OJFTLMU1IG  [+] Enumerated sessions
  SMB         10.10.10.10    445    WIN-8OJFTLMU1IG  \\10.10.10.10            User:Administrator
  

• Impacket Smbclient

  $ impacket-smbclient Administrator@10.10.10.10
  # who
  host:  \\10.10.10.10, user: Administrator, active:     1, idle:     0
  

• PowerView Invoke-UserHunter

  # Find computers were a Domain Admin OR a specified user has a session
  Invoke-UserHunter
  Invoke-UserHunter -GroupName "RDPUsers"
  Invoke-UserHunter -Stealth
  

Other Interesting Commands

• Find Domain Controllers

  nslookup domain.com
  nslookup -type=srv _ldap._tcp.dc._msdcs.<domain>.com
  nltest /dclist:domain.com
  Get-ADDomainController -filter * | Select-Object name
  gpresult /r
  $Env:LOGONSERVER 
  echo %LOGONSERVER%
  

References

• Explain like I’m 5: Kerberos – Apr 2, 2013 – @roguelynn
• Pen Testing Active Directory Environments – Part I: Introduction to crackmapexec (and PowerView)
• Pen Testing Active Directory Environments – Part II: Getting Stuff Done With PowerView
• Pen Testing Active Directory Environments – Part III: Chasing Power Users
• Pen Testing Active Directory Environments – Part IV: Graph Fun
• Pen Testing Active Directory Environments – Part V: Admins and Graphs
• Pen Testing Active Directory Environments – Part VI: The Final Case
• Attacking Active Directory: 0 to 0.9 – Eloy Pérez González – 2021/05/29
• Fun with LDAP, Kerberos (and MSRPC) in AD Environments
• Penetration Testing Active Directory, Part I – March 5, 2019 – Hausec
• Penetration Testing Active Directory, Part II – March 12, 2019 – Hausec
• Using bloodhound to map the user network – Hausec
• PowerView 3.0 Tricks – HarmJ0y