Earlier quoted context omitted.
> "White hats" do not in fact routinely sell software intended almost solely to harvest financial information from botnets. The indictment doesn't allege that the defendant sold it, only that he wrote it and someone else sold it. And as you know, white hats create proof of concept code all the time. And give it to various people (including, in the end, anyone) for various meritorious reasons.
You are suggesting he spent time and energy to build a proof of concept whose explicit task was to demonstrate banking theft from browsers, and he chose to never release it but keep it secret, and a friend decided to sell it on the dark web? And as a malware researcher when he became aware that his proof of concept was indeed being used to conduct fraud, he turned a blind eye?
The least plausible part of this chain of events is that Kronos, from what I can see, is not a very interesting piece of software - more a tedious exercise in plumbing than an interesting proof-of-concept.