Windows Security Hardening: 15 Essential Configuration Steps
Derek H.
Why Hardening Matters
A default Windows installation is designed for compatibility, not security. Many features and services that ship enabled are unnecessary for most users and expand the attack surface. Hardening is the process of configuring the operating system to minimize vulnerabilities while maintaining the functionality you need.
Account and Authentication Hardening
Rename or disable the built-in Administrator account. Create named admin accounts for specific administrators so actions can be attributed to individuals. Enable Local Security Policy settings that lock accounts after five failed login attempts. Require complex passwords of at least 14 characters. Enable Windows Hello for Business or smart card authentication where possible. Disable NTLM authentication in favor of Kerberos.
Attack Surface Reduction
Disable SMBv1, which has been the vector for devastating attacks like WannaCry and NotPetya. Turn off Remote Desktop Protocol (RDP) unless specifically required, and if required, restrict it to specific IP addresses and require Network Level Authentication. Remove PowerShell v2, which lacks modern logging capabilities. Enable Attack Surface Reduction rules in Windows Defender to block common malware techniques like Office macros launching child processes.
Logging and Auditing
Enable advanced audit policies through Group Policy. Log successful and failed logon events, process creation with command-line arguments, privilege use, and object access for sensitive files. Forward these logs to a central SIEM. Without logging, you cannot detect or investigate security incidents. True Protection supplements Windows native logging with additional telemetry that captures file system changes, network connections, and registry modifications at the process level.
Keeping Windows Updated
Enable automatic updates and ensure they are applied within 48 hours of release for critical patches. Use Windows Server Update Services (WSUS) or a similar tool in enterprise environments to test and deploy patches systematically. Monitor for failed updates and address them immediately - an update that fails silently leaves the system vulnerable indefinitely.