Active Directory Tiering & Hardening
A penetration test revealed that a single phished workstation could reach Domain Admin within hours. The bank had 47 accounts in Domain Admins, no separation between administration tiers, and a regulatory exam approaching that scrutinized privileged access controls.
Performed an AD security assessment scored against tiered-administration best practices.
Designed a Tier 0/1/2 model with dedicated admin accounts and secure admin workstation guidance.
Cleaned up privileged group membership and implemented least-privilege delegation.
Deployed authentication policies and silos to prevent Tier 0 credential exposure on lower tiers.
Documented break-glass procedures and produced exam-ready evidence.
Privileged accounts were reduced by 87%, and the tiered model contained credential-theft lateral movement. The bank passed its regulatory exam with no privileged-access findings.
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