Regardless of what is really contained in this file (and it looks fishy indeed), the above quote is the most important thing. Steve15, if you wanted to play fair, you should disclose the vulnerability as a whole and in detail. Then:
1. Miners would know what the danger really is, without running some encrypted, suspicious executables. Then they can react fast and protect their rigs.
2. KNC would be forced to patch their firmware quickly, if really needed.
3. You would be acknowledged as the discoverer and would show your real pentesting skill.
I would go for disclosure, especially as you said that KNC tried to hide the problem under the carpet. Instead, the fact is the whole story is directed by you in a way that try to encourage people to run some encrypted, probably dangerous, application. As ici_lemmy said, if they are dumb enough, well...