Technical Guides 15 min read

Active Directory & Lateral Movement: What Happens After the External Perimeter Breach?

Gaining an initial foothold in a corporate network is merely stage one. The attacker's ultimate prize is Active Directory domination to deploy ransomware network-wide in minutes. Analyzing internal privilege escalation tactics and defensive tiering architectures.

Author: Areg Arakelyan
Current as of:
Audit standard: ISO/IEC 27001

Internal Escalation Realities

  • The Domain Controller (DC): Control over the DC grants complete dominion over every corporate asset, workstation, and confidential file.
  • Kerberoasting & AS-REP Roasting: Stealthy extraction of service account password hashes for offline dictionary cracking without alerting security logs.
  • Tiered Administration Architecture: The only proven architectural defense preventing local workstation compromises from cascading into Domain Admin takeovers.

1. From Initial Foothold to Domain Dominance

  1. Local credential harvesting from LSASS memory on the compromised host.
  2. Lateral movement to neighboring application servers using WMI, WinRM, or SMB.
  3. DCSync attack impersonating a replica domain controller to retrieve all domain hashes.
  4. Global ransomware execution via Active Directory Group Policy Objects (GPOs).
Areg Arakelyan

Areg Arakelyan

Lead Security Analyst, Suisse IT GmbH. Specialist in adversary simulation, attack surface assessment, and hardening of Swiss healthcare, local government, and enterprises.