Privileged Accounts: Attack & Defense Guide

Privileged accounts are accounts granted elevated permissions beyond standard user rights. They include local administrators, domain admins, service accounts, built-in SYSTEM accounts, and cloud IAM roles with broad scopes. These accounts are central to cybersecurity because compromising one gives an attacker lateral movement capability and often full domain or tenant control. Privilege is defined by access to sensitive resources: Active Directory objects, GPO management, credential stores, backup systems, and hypervisor consoles. The attack surface is large because privileged accounts are often shared, rarely rotated, and poorly monitored. In Active Directory environments, accounts in groups such as Domain Admins, Enterprise Admins, Schema Admins, and Account Operators carry implicit trust across the entire forest. Service accounts compound the risk because they frequently hold elevated rights while running unattended processes, making them ideal targets for credential extraction. Understanding what constitutes a privileged account is the first step toward reducing the blast radius of any compromise.

Detecting abuse of privileged accounts requires event log correlation across multiple Windows security event IDs. Event ID 4672 logs special privileges assigned at logon — every occurrence should be reviewed for unexpected accounts or workstations. Event ID 4624 with logon type 3 or 10 from a privileged account on a non-admin workstation is a strong lateral movement indicator. Event ID 4728, 4732, and 4756 track membership changes to sensitive groups and should trigger immediate alerts. Event ID 4769 and 4768 are critical for detecting Kerberoasting and AS-REP roasting attempts targeting service accounts. LSASS access attempts are captured through Sysmon Event ID 10, filtering for access rights 0x1010 or 0x1038. A SIEM rule correlating 4625 failures followed by 4624 success on privileged accounts reveals brute-force or password-spray patterns. Privileged Access Workstation (PAW) enforcement can be validated by monitoring logon source IP or hostname against an approved inventory. Microsoft Defender for Identity provides behavioral baselines and flags pass-the-hash, pass-the-ticket, and golden ticket usage directly without manual log parsing.

Red Team operators target privileged accounts through multiple chained techniques. Kerberoasting requests TGS tickets for service accounts with SPNs set. Offline cracking then recovers cleartext credentials without any direct account interaction. AS-REP roasting targets accounts with Kerberos pre-authentication disabled, a misconfiguration common in legacy environments. Once local admin credentials are obtained, tools such as Mimikatz extract LSASS memory to retrieve NTLM hashes or Kerberos tickets, enabling pass-the-hash or pass-the-ticket attacks. BloodHound maps shortest paths to Domain Admin, revealing over-permissioned accounts, ACL misconfigurations, and delegation abuse. Unconstrained delegation on computer accounts allows ticket capture and impersonation of any user authenticating to that host. Counter-measures include deploying Microsoft LAPS to rotate local admin passwords per machine, enforcing a three-tier AD model to isolate admin accounts by asset sensitivity, enabling Protected Users group membership for all tier-0 accounts, and requiring smart card authentication for domain admin logons. Regularly auditing SPN registrations, disabling legacy Kerberos delegation, and rotating service account credentials via managed service accounts (gMSA) significantly reduce the exploitable attack surface.