Active Directory is the identity backbone of almost every enterprise, and for IAM professionals it is where the most serious security problems live. Attackers target AD relentlessly because compromising it means controlling the whole organisation. Here are the security fundamentals every IAM professional must know to protect it.
Understand the Kerberos Attack Surface
Kerberos authentication powers Windows domain access, and its ticket flow is the favourite target of attackers. Techniques like Kerberoasting and golden ticket attacks exploit how tickets are issued and used. IAM professionals do not need to be exploit engineers, but they must understand what these attacks are and which controls – like disabling unnecessary service principal names and auditing ticket use – reduce the risk.
Protect Privileged Accounts First
Domain admins, service accounts and emergency accounts carry the keys to everything. Unnecessary administrative memberships are one of the most common weaknesses found in real audits. Apply the principle of least privilege: remove standing admin rights, use dedicated admin accounts, and implement just-in-time access for high-risk actions.
Watch the Security Boundaries
Group Policy, certificate services and the AD trust relationships are all frequently abused. Disabling NTLM where possible, monitoring certificate enrolment and auditing group membership changes belong on every IAM professional’s checklist, because attackers exploit configuration gaps far more often than software bugs.
Monitoring Is the Control That Matters
You cannot protect what you cannot see. Enable advanced auditing, forward logs to a SIEM, and build alerts for the highest-risk events: account lockout spikes, privilege escalation, new admin memberships and unusual logon hours. Most real-world AD attacks succeed because nobody noticed the warning signs.
Make It a Continuous Process
AD security is not a one-time project. Regular reviews of privileged access, quarterly certification campaigns and continuous monitoring keep the environment safe as the company changes. SkilBrill’s IAM training covers Active Directory security fundamentals with practical labs, so you understand exactly where risk lives and how to protect it.