WinSOS – Harnessing Trusted Binaries For Stealthy DLL Hijacking

WinSOS represents a sophisticated technique that turns the Windows operating system’s own features against it.

By manipulating executables in the WinSxS folder, a component trusted by Windows, attackers can discreetly execute malicious code.

This method, building on DLL Search Order Hijacking, does not require elevated privileges, making it a stealthy approach for infiltrating Windows 10 and 11 systems.

It stands out for its ability to bypass traditional defense mechanisms, leveraging the inherent trust in system binaries to conceal malicious activities.

This technique utilizes executables within the WinSxS folder, commonly trusted by Windows, to exploit the classic DLL Search Order Hijacking method.

By leveraging these executables, threat actors can execute malicious code within Windows applications without requiring elevated privileges.

This approach eliminates the need for additional binaries in the attack chain and enables the execution of malicious code from any location.

It is compatible with both Windows 10 and 11 and can evade detection by defense software and responders, as the malicious code runs within the memory space of a trusted binary.

This technique simplifies the classic DLL Search Order Hijacking and exploits native Windows functionalities without directly exploiting an OS issue.