Active Directory Hardening Best Practices

A domain controller should do one thing: control the domain. Why ADDS belongs on a DC and which roles, tools, and apps to keep off it to shrink the attack surface.

An updated classic on AD's structural weaknesses—legacy defaults built for discovery, easily enumerated privileged groups—and five common attack methods, with countermeasures for protection.

DC security essentials: promotion changes a server's logon model and access must be tightly restricted. GPOs linked to the Domain Controllers OU affect all DCs, so mistakes are high-impact.

An unsecured directory exposed a red team's toolkit — Cobalt Strike, Havoc and Villain C2 frameworks, BloodHound data and kerberoasted hashes — after poor OPSEC, as first spotted by Justin Elze.

Semperis argues AI-driven attacks are outpacing identity teams as machine identities outnumber human ones 10:1, and urges building organization-wide cyber resilience around hybrid identity protection before the next crisis.

Why Microsoft is retiring RC4 encryption to blunt Kerberoasting, which applications depend on it, and how to audit your AD environment to find RC4-dependent accounts before enforcement bites.