Researchers at Bitdefender reveal that Windows bind links can be exploited to hide malware from EDR tools. This manipulation allows attackers to redirect legitimate paths to malicious files, evading detection by security systems reliant on path validation.
Windows bind links, implemented by bindflt.sys, serve as a kernel-level feature that directs virtual paths to real backing paths. Used in Windows Store apps, Windows Sandbox, and containers, this function helps manage file accessibility and path redirection.
Bitdefender demonstrates how altering the backing paths of bind links can allow the loading of malicious files undetected. If a bind link points to a DLL, it can facilitate file-binding, where processes load an attacker's malicious file perceived to be legitimate.
Defenses that rely primarily on path validation may overlook manipulated bind links, mistaking them for valid, trusted paths. As a result, systems might allow access to malicious content while perceiving it as safe.
Bitdefender describes attack techniques such as simple path hijacking, which can circumvent the Antimalware Scan Interface (AMSI). An attacker can redirect legitimate power shell commands to invoke a malicious DLL without detection, thus neutralizing security measures without modifying them directly.
Although Microsoft assessed the severity of these findings as low because admin access is required, Bitdefender highlights that attackers commonly gain such access, emphasizing the threat's relevance.
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Researchers at Bitdefender reveal that Windows bind links can be exploited to hide malware from EDR tools. This manipulation allows attackers to redirect legitimate paths to malicious files, evading detection by security systems reliant on path validation.