The libffi bindings are now working, which means that RustRAT is now able to execute WebAssembly binaries, and those binaries can call arbitrary functions from dlls. I have also uploaded the code to github, so it is possible to follow the progress at https://github.com/rustrat/rustrat
. In this post I will briefly mention what has been done so far, the next step on the way to a full-fledged RAT, and finally a little guide on how to call MessageBoxA from a WebAssembly binary.
The present Currently RustRAT is not very exciting, but it is possible to demonstrate the libffi capabilities. The “rustrat-client” executables can be used to execute WebAssembly binaries, for example from the “demo-messagebox” crate, which will call MessageBoxA.