I bet it would be the next level (if it doesn't exists already) to be used by top-level agencies, or by bad guys. Some code already found in the wild couldn't

I bet it would be the next level (if it doesn't exists already) to be used by top-level agencies, or by bad guys. Some code already found in the wild couldn't be decrypted (e.g., stuxnet), has obfuscated connection (e.g. https://news.ycombinator.com/item?id=18864895 https://news.ycombinator.com/item?id=18864895) and is updated as needed (any C&C that sends new modules to the infected machine). Add some capability to self modify and you can have hard times generating signatures ou behaviours that are traced by "antivirus", firewall, and so on.