Novel Windows Registry Persistence Technique Evasion Bypasses EDR Detection via NTUSER.MAN Manipulation

A newly disclosed Windows registry persistence technique demonstrates how attackers can maintain medium-integrity persistence while evading detection from all tested EDR solutions. The method, developed over 18 months, exploits modifications to the NTUSER.MAN file within %USERPROFILE%, which corresponds to the HKCU hive. Unlike traditional registry persistence methods that trigger EDR callbacks through direct registry API calls, this approach writes directly to the registry hive file, bypassing monitoring hooks. The technique's effectiveness stems from security solutions typically focusing on HKLM modifications rather than user-specific HKCU changes. For cybersecurity professionals, this underscores critical detection gaps in current EDR implementations. Defenders should prioritize monitoring NTUSER.MAN file modifications in user profile directories and review EDR configurations to ensure comprehensive coverage of HKCU registry activity. This development highlights the ongoing evolution of persistence techniques targeting less-monitored system components, necessitating defense-in-depth strategies that include file system monitoring alongside traditional registry monitoring.