Active Directory (AD) is the backbone of most enterprise Windows environments. From authentication and authorization to domain management and access control, Active Directory handles some of the most critical operations inside an organization. Because of this, attackers heavily target AD environments during real-world cyber attacks.
An Active Directory penetration test helps organizations identify security weaknesses, misconfigurations, privilege escalation paths, exposed credentials, insecure protocols, and attack vectors that could allow a threat actor to compromise an internal network.
In this blog, we will explore the complete Active Directory penetration testing methodology, assessment process, tools, phases, common attack techniques, and best practices used during internal network security assessments.
What is Active Directory Penetration Testing?
Active Directory penetration testing is a security assessment process focused on identifying vulnerabilities and security weaknesses within a Windows domain environment.
The goal is to simulate a real-world attacker who has gained internal network access and wants to:
- Enumerate the environment
- Discover users and systems
- Identify misconfigurations
- Escalate privileges
- Move laterally
- Gain Domain Administrator access
- Access sensitive assets
AD penetration testing is one of the most important parts of an internal infrastructure VAPT because many enterprise breaches start from internal compromise.
Why Active Directory Security Matters
Most organizations depend on Active Directory for:
- User authentication
- Group policy management
- Access control
- Domain administration
- File sharing permissions
- Remote access control
If attackers compromise Active Directory, they often gain complete control over the organization.
Common impacts include:
- Domain takeover
- Ransomware deployment
- Credential theft
- Sensitive data access
- Persistence inside the network
- Lateral movement across systems
This is why internal AD assessments are critical for organizations of all sizes.
Active Directory Penetration Testing Methodology
A professional Active Directory penetration test usually follows multiple phases.
1. Information Gathering and Enumeration
The first phase focuses on collecting information about the domain environment.
During this stage, testers identify:
- Domain names
- Domain controllers
- Users and groups
- Shared folders
- Running services
- Network architecture
- Hostnames
- Operating systems
- Trust relationships
Common tools used:
- Nmap
- NetExec
- BloodHound
- enum4linux
- rpcclient
- CrackMapExec
- LDAP queries
Example Nmap Scan:
nmap -Pn -sV 192.168.1.0/24This helps identify:
- SMB services
- LDAP
- Kerberos
- RDP
- WinRM
- DNS
Common AD Ports:
| Service | Port |
|---|---|
| LDAP | 389 |
| LDAPS | 636 |
| Kerberos | 88 |
| SMB | 445 |
| DNS | 53 |
| WinRM | 5985 |
| RDP | 3389 |
2. User Enumeration
After identifying domain systems, the next step is user enumeration.
The objective is to identify:
- Domain users
- Privileged accounts
- Service accounts
- Disabled accounts
- Password policies
Example Commands:
net user /domainUsing rpcclient:
rpcclient -U "" -N 192.168.1.10Then:
enumdomusersThis phase is extremely important because attackers rely heavily on valid usernames during password attacks.
3. SMB and Share Enumeration
Misconfigured SMB shares are one of the most common weaknesses in internal environments.
Testers check for:
- Anonymous access
- Sensitive documents
- Password files
- Backup configurations
- Scripts containing credentials
Example:
smbclient -L //192.168.1.10/Connecting to share:
smbclient //192.168.1.10/sharedMany organizations accidentally expose:
- HR documents
- VPN credentials
- Password spreadsheets
- Internal scripts
- Backup files
4. Credential Attacks
Credential attacks are one of the most effective techniques during Active Directory penetration testing.
Common approaches include:
- Password spraying
- Brute force attacks
- Kerberoasting
- AS-REP roasting
- NTLM hash attacks
Password Spraying
Password spraying tests a common password against multiple accounts.
Example:
crackmapexec smb 192.168.1.0/24 -u users.txt -p Password@123This helps avoid account lockouts.
5. Kerberoasting
Kerberoasting targets service accounts associated with Service Principal Names (SPNs).
Attackers request Kerberos tickets and attempt offline password cracking.
Common tools:
- Impacket
- Rubeus
- GetUserSPNs.py
Example:
GetUserSPNs.py domain.local/user:password -dc-ip 192.168.1.10Weak service account passwords can lead to privilege escalation.
6. BloodHound Analysis
BloodHound is one of the most powerful tools for Active Directory assessments.
It helps visualize:
- User privileges
- Group memberships
- Attack paths
- Delegation permissions
- ACL misconfigurations
Collectors:
- SharpHound
- BloodHound.py
Common attack path examples:
- GenericAll permissions
- DCSync rights
- Kerberoastable accounts
- Local admin access
BloodHound helps identify hidden privilege escalation paths that are difficult to detect manually.
Learn more from the official BloodHound Project
7. Privilege Escalation
Privilege escalation focuses on obtaining higher-level permissions inside the domain.
Common techniques:
- Weak ACL permissions
- Misconfigured GPOs
- Unquoted service paths
- Token impersonation
- Credential dumping
- Local administrator reuse
Common tools:
- Mimikatz
- Seatbelt
- PowerUp
- WinPEAS
Example Mimikatz command:
sekurlsa::logonpasswordsThis may expose:
- Plaintext credentials
- NTLM hashes
- Kerberos tickets
8. Lateral Movement
After gaining privileged access, attackers attempt lateral movement across systems.
Common protocols used:
- SMB
- RDP
- WinRM
- PsExec
- WMI
Example using PsExec:
psexec.py administrator@192.168.1.20Objectives:
- Access critical servers
- Reach domain controllers
- Deploy persistence
- Exfiltrate data
9. Domain Controller Compromise
The final objective in many AD attacks is compromising the Domain Controller.
Techniques may include:
- DCSync attacks
- Golden Ticket attacks
- Pass-the-Hash
- Pass-the-Ticket
- NTDS.dit extraction
Example DCSync:
lsadump::dcsyncIf successful, attackers can replicate password hashes from the domain controller.
This is considered a critical security compromise.
Common Active Directory Weaknesses
During assessments, the following issues are commonly identified:
| Weakness | Risk |
|---|---|
| Weak Passwords | Credential compromise |
| SMB Signing Disabled | Relay attacks |
| Unrestricted Delegation | Privilege escalation |
| Kerberoastable Accounts | Offline password cracking |
| Shared Local Admin Passwords | Lateral movement |
| Excessive Privileges | Domain compromise |
| Anonymous SMB Access | Information disclosure |
| Legacy Protocols | Exploitation risk |
Active Directory Penetration Testing Tools
Here are some widely used AD security assessment tools:
| Tool | Purpose |
|---|---|
| Nmap | Network discovery |
| NetExec | SMB and authentication testing |
| BloodHound | Attack path mapping |
| Mimikatz | Credential dumping |
| Impacket | AD attack toolkit |
| Rubeus | Kerberos abuse |
| CrackMapExec | Post-exploitation |
| enum4linux | SMB enumeration |
| Responder | LLMNR/NBT-NS poisoning |
Official Resources:
Reporting in Active Directory VAPT
A professional AD penetration testing report should include:
- Executive summary
- Scope and methodology
- Network architecture overview
- Enumeration findings
- Attack paths
- Vulnerabilities identified
- Risk ratings
- Evidence and screenshots
- Mitigation recommendations
- Impact analysis
Each finding should clearly explain:
- Root cause
- Exploitation method
- Business impact
- Technical impact
- Remediation steps
Best Practices for Securing Active Directory
Organizations should implement:
- Strong password policies
- Multi-factor authentication
- SMB signing
- Tiered administration
- Least privilege access
- Privileged Access Workstations (PAW)
- Kerberos hardening
- Regular AD audits
- Monitoring and logging
- Endpoint protection
Security teams should also regularly review:
- Domain Admin memberships
- Service account permissions
- Trust relationships
- Group Policy Objects
- Local administrator usage
Internal PentestHint Resources
You can explore more cybersecurity and penetration testing content on:
Conclusion
Active Directory penetration testing is one of the most important components of internal infrastructure security assessments. Modern attackers heavily target Windows domain environments because compromising Active Directory often leads to full organizational compromise.
A proper AD penetration test helps organizations identify privilege escalation paths, credential exposure risks, insecure configurations, weak permissions, and lateral movement opportunities before attackers exploit them.
Whether you are a cybersecurity student, SOC analyst, red teamer, or penetration tester, learning Active Directory security methodology is essential for understanding modern enterprise attack surfaces.
