Perfect DLL Proxy – Streamlining DLL Hijacking With Absolute Path Forwarding

In the complex landscape of cybersecurity, DLL hijacking stands out as a notable technique for exploiting software vulnerabilities.

This article introduces “Perfect DLL Proxy,” a sophisticated method that refines the traditional approach to DLL hijacking.

By leveraging a unique trick that utilizes absolute paths for forwarding, it bypasses the limitations of ASM stubs, offering a cleaner, more efficient proxy solution for advanced users and developers alike.

A while ago I needed a proxy to perform DLL hijacking, but I did not like how existing solutions generated ASM stubs to deal with the forwarding. It turns out that there is a trick to get forwards to work with an absolute path:

#pragma comment(linker,
"/EXPORT:CredPackAuthenticationBufferA=\\\\.\\GLOBALROOT\\SystemRoot\\System32\\credui.dll.CredPackAuthenticationBufferA"
)

See the references for more information.

Usage

python -m pip install pefile
python perfect-dll-proxy.py credui.dll

Varshini

Varshini is a Cyber Security expert in Threat Analysis, Vulnerability Assessment, and Research. Passionate about staying ahead of emerging Threats and Technologies.