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Introduction:
Active Directory (AD) is the cornerstone of modern enterprise identity and access management, making it a prime target for cyber attackers and a critical area for defenders. Mastering its complex structure of domains, trusts, users, computers, and group policies is the first step toward securing—or compromising—a corporate network. The recently updated Orange Cyberdefense AD mindmap provides a comprehensive visual guide to this intricate ecosystem.
Learning Objectives:
- Understand the core components and attack vectors within an Active Directory environment.
- Learn essential commands for enumerating and assessing AD security from both offensive and defensive perspectives.
- Develop a methodology for hardening AD against common exploitation techniques.
You Should Know:
1. Enumerating Domain Information with PowerView
PowerView is an indispensable PowerShell tool for assessing AD. This command helps you understand the domain structure.
Get-NetDomain
Step-by-step guide: This cmdlet, part of the PowerView toolkit, retrieves fundamental information about the current domain, such as the domain name, SID, and forest functionality level. To use it, first import the PowerView module into a PowerShell session (Import-Module .\PowerView.ps1). Then, simply execute the command. The output provides a baseline understanding of the target domain, which is crucial for planning both reconnaissance and defense.
2. Discovering Domain Controllers
Identifying Domain Controllers (DCs) is a primary objective, as they hold the keys to the kingdom.
Get-NetDomainController
Step-by-step guide: This PowerView command lists all Domain Controllers in the current domain. It returns details including the DC’s hostname, OS version, IP address, and whether it holds the Flexible Single Master Operations (FSMO) roles. For defenders, this is vital for identifying all critical assets that require the highest level of security hardening and monitoring.
3. Mapping Domain Trusts
Understanding trust relationships between domains is key to identifying lateral movement paths.
Get-NetDomainTrust
Step-by-step guide: Executing this command will enumerate all domain trusts for the current domain. It shows the source and target domain names, the trust direction (Inbound, Outbound, or Bidirectional), and the trust type. Attackers use this to find paths to escalate privileges across domain boundaries, while defenders need this map to monitor and secure trust boundaries effectively.
4. Enumerating All Domain Users
A comprehensive list of users is a goldmine for an attacker crafting phishing campaigns or finding high-value targets.
Get-NetUser | select cn,description,logoncount,lastlogon
Step-by-step guide: This powerful PowerView query fetches all user objects in the domain. The `select` statement filters the output to show the common name, description (often containing passwords or service accounts), logon count, and last logon timestamp. Defenders should regularly audit this list for stale or improperly described accounts, which are common security weaknesses.
5. Finding High-Value Group Members
Privileged groups like Domain Admins and Enterprise Admins are the ultimate targets.
Get-NetGroupMember -GroupName "Domain Admins"
Step-by-step guide: This command lists all members of the specified privileged group. From a defensive standpoint, the membership of these groups should be extremely limited and meticulously audited. Any unexpected user or service account in this list is a major red flag indicating a potential compromise.
6. Uncovering Kerberoastable Accounts
Service accounts with SPNs are susceptible to Kerberoasting attacks.
Get-NetUser -SPN | select samaccountname,serviceprincipalname
Step-by-step guide: This query finds all user accounts that have a Service Principal Name (SPN) set, which typically indicates a service account. Attackers can request Kerberos tickets for these accounts and attempt to crack the passwords offline. Defenders should ensure these accounts have long, complex, and regularly rotated passwords.
7. Windows Built-in: Querying Domain Controllers
You don’t always need external tools; native Windows commands are equally important.
nltest /dclist:<domain_name>
Step-by-step guide: This native Windows command-line utility lists all Domain Controllers for a specified domain. It’s a trusted command available on all domain-joined Windows systems and is less likely to be flagged by security software compared to PowerShell scripts, making it valuable for both red and blue teams.
8. Windows Built-in: Checking Domain Trusts
A simple native method to verify domain trusts.
nltest /domain_trusts
Step-by-step guide: Similar to the PowerView command, `nltest` provides a list of all domain trusts from the perspective of the local machine. It’s a quick and easy way to get a snapshot of the trust relationships without importing any external scripts, useful for a rapid initial assessment.
9. Linux Reconnaissance with ldapsearch
Attackers often use Linux-based tooling. `ldapsearch` allows for AD enumeration from a Linux machine.
ldapsearch -x -H ldap://<DC_IP> -D "<user@domain>" -w "<password>" -b "dc=domain,dc=com" "(objectClass=user)" samaccountname
Step-by-step guide: This command connects to a Domain Controller’s LDAP service to query all user objects and extract their SAM account names. The `-x` specifies simple authentication, `-H` is the LDAP server URI, `-D` and `-w` are the credentials, and `-b` is the base Distinguished Name for the search. Defenders should monitor for LDAP anonymous binds and brute-force attempts.
10. Hardening: Preventing Password Spraying with Lockout Policy
A key defensive mitigation is implementing a strong account lockout policy.
net accounts /lockoutthreshold:10 /lockoutwindow:30 /lockoutduration:30
Step-by-step guide: This command sets the account lockout policy: locking an account after 10 invalid attempts (/lockoutthreshold:10) within a 30-minute observation window (/lockoutwindow:30), and keeping it locked for 30 minutes (/lockoutduration:30). This significantly hinders password spraying attacks. This should be configured via Group Policy Object (GPO) for enterprise-wide enforcement.
What Undercode Say:
- A detailed AD mindmap is not just a cheatsheet; it’s a strategic roadmap that highlights the interconnectedness of assets and the potential attack paths an adversary would follow.
- The fundamental difference between a successful red team operation and a robust defense often boils down to who knows the AD environment better. Comprehensive enumeration is the common denominator for both.
The Orange Cyberdefense mindmap crystallizes the vast complexity of Active Directory into a single, actionable document. For offensive security professionals, it serves as a checklist to ensure no attack vector is overlooked during an assessment. For defenders and system administrators, it is an essential audit framework, highlighting every component that needs to be hardened, monitored, and maintained. In the ongoing battle for control of the network, this knowledge is the ultimate weapon. The tools and commands listed are the practical application of this knowledge, allowing for the translation of strategic understanding into tactical action.
Prediction:
As cloud identity systems like Azure AD become more integrated with traditional on-premise Active Directory, the attack surface will continue to evolve. Future large-scale compromises will increasingly leverage misconfigurations in these hybrid identity environments. Mindmaps and methodologies will need to expand beyond the traditional forest to encompass a holistic view of “Identity” as the new perimeter, making foundational AD knowledge more critical than ever.
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IT/Security Reporter URL:
Reported By: Jmetayer La – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
