I'm trying to MITM an Android application but I cannot get it to work properly. Usually, I'm using Burp for those kind of attacks, which allows me to intercept and decrypt HTTPS traffic. (Assuming the certificate is installed on the Android device.)
However, it seems the application I'm currently testing is using a non-HTTP(S) protocol, but still TCP at port 443. I've googled my issue and discovered the following Burp plugin: https://github.com/summitt/Burp-Non-HTTP-Extension
Sadly, this plugin does not work properly for me and other's seem to have similar issues. I've also discovered mitmproxy but this just like burp only works on HTTP(S) traffic.
Does someone have any idea on how to perform a MITM on this application and which tool I should be using?