New Windows Bind Link Techniques Enable EDR Evasion for Attackers

Bitdefender researchers have identified three new techniques that exploit Windows Bind Links to bypass endpoint detection and response (EDR) systems. These techniques—File-Binding, Process-Binding, and Silo-Binding—allow attackers with administrator privileges to redirect file paths to malicious files while appearing legitimate to security tools. File-Binding hijacks DLL paths, such as AMSI.dll, to load harmful code undetected. Process-Binding makes malicious executables masquerade as trusted processes, like winver.exe. The most advanced, Silo-Binding, utilizes Windows silos to create isolated filesystem views, evading detection from external scanners. Microsoft has assessed the threat as low severity, citing the requirement for admin access, but Bitdefender warns that this method poses a significant risk for ransomware groups. The techniques can bypass security measures like AppLocker and Windows Firewall, making them potent tools for post-compromise scenarios.

Key Points: • Three techniques exploiting Windows Bind Links allow EDR evasion. • Attackers need administrator privileges to execute these methods. • Microsoft classified the threat as low severity despite its potential impact.