EDR Evasion Stack Helps Process Injection Slip Past Defenses
New EDR evasion technique uses process parameter poisoning for code injection.
A novel technique for injecting code into running processes, dubbed 'process parameter poisoning,' has been identified. This method bypasses traditional Endpoint Detection and Response (EDR) solutions by manipulating process initialization structures without invoking common Windows APIs that EDR tools monitor, making it harder to detect.
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The lesson from this incident
Full lessonAttackers have developed a novel process injection technique called 'process parameter poisoning' that manipulates Windows process initialization structures (RTL_USER_PROCESS_PARAMETERS) without triggering the common API calls that EDR tools rely on to detect malicious activity. This exposes a fundamental weakness in signature- and API-hook-based detection strategies: if defenders only watch known-bad API calls, adversaries will simply route around them. The technique underscores that EDR solutions, while valuable, should never be treated as a complete defense in isolation. Organizations that rely solely on EDR for endpoint visibility are left blind to evasion techniques that operate below or beside monitored API layers. A layered, defense-in-depth posture combining behavioral analytics, memory scanning, and robust logging is essential to closing these gaps.
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