You don't test your cyber weapons so anyone notices. It's giving away that you have a weapon and gives your enemy time to adapt and protect themselves. Mabe it's someone tired of the boss not listening to the complaints of potentially crippling bugs in the security and is now doing a presentation of what would happen to society if he does not get to fix the bug?

Or a provider of DDOS-protection that is running their own DDOS botnet for kicks? Mirai comes to mind here... :-)