That’s my prediction: these guys are like bike thieves who found out the hard way that they just stole a bike belonging to the police chief and so it’s actually being investigated rather than written off. I don’t think they were remotely prepared for this level of scrutiny.
My thoughts exactly. Isn't the tactic to phish multiple potential victims and then they just get email responses from the victims whose data was caught? From the attackers' perspective they could have accidentally made a big catch instead of "targeted critical national infrastructure".