Windows Bind Link Attacks Can Bypass EDR Tools, Leaving Malware Undetected
Security researchers at Bitdefender have uncovered a vulnerability in Windows that allows attackers to evade detection by Endpoint Detection and Response (EDR) tools using a legitimate feature called bind links. This technique can be exploited to load hidden malware onto a system, making it nearly impossible for EDR tools to detect.
Bind links are a kernel-level redirection mechanism used by Windows to create virtual paths that map onto real backing paths. They are employed by Store apps, Windows Sandbox, and Windows containers. However, if an attacker alters the bind link so that the backing path points to a malicious file, it becomes nearly invisible to EDR tools. The system sees only a valid link pointing to an innocuous file, making it difficult for defenses to detect the malware.
The researchers demonstrated three attack techniques that manipulate bind links: file-binding, process-binding, and silo-binding. File-binding involves hijacking DLL paths, which are trusted by other processes, allowing attackers to redirect them to malicious files without being detected. This technique was used to evade AMSI.dll (the Antimalware Scan Interface) in PowerShell.
The second attack, process-binding, is an extension of file-binding applied to executable images. It can be used to bypass EDR detection and load malware onto a system. When the EDR is loaded, it checks the file path and assumes it to be correct, but in reality, it’s looking at a harmless file.
The most sophisticated attack technique demonstrated by Bitdefender is silo-binding, which requires creating a user-defined Windows silo. A silo provides an isolated view of the system for the processes within it, making it difficult for EDR tools to detect bind links inside the silo. This method allows attackers to create two filesystem views: one where the trusted name resolves to the payload and another where the payload path resolves back to a clean file.
Microsoft assessed Bitdefender’s findings as low severity since it requires admin access. However, the researchers argue that this is not a significant obstacle for attackers, who often obtain administrator access to carry out their malicious activities.
The implications of these attack techniques are alarming, as they can be used to load malware onto a system without being detected by EDR tools. This highlights the need for security professionals to revisit their defenses and consider alternative approaches that don’t rely solely on path-based detection.
So what does this mean for you? If you’re responsible for securing your organization’s systems, it’s essential to recognize the limitations of traditional EDR tools and explore additional measures such as behavioral analysis or sandboxing. Additionally, stay vigilant and monitor your system’s behavior for any signs of suspicious activity. Remember that attacker ingenuity knows no bounds, so it’s crucial to stay ahead of the curve by continuously updating and adapting your security posture.
Source: SecurityWeek — 2026-07-15