*DLL Function Proxying* I started playing with this technique after finding a fair bit of intel within our dataset, while testing our new search interface (internal tool). For those that aren’t familiar with this vector, a malicious dll replaces the functionality of a legitimate dll, proxying legitimate functionality and executing malicious code (in this case shellcode). While we did test this on an MDE protected endpoint, some assumptions were made. FileZilla client (latest version) would have to be installed and a UAC bypass needed to access program files. Regardless, the point was just to investigate how function proxying works so that a more comprehensive vector could be developed.
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