We've seen quite a few of these phishing kits popping up lately. Here's some insight into one called Knight Office. Analysis by Andrea Hatcher, @threatresearch@infosec.exchange @tanner@infosec.exchange and @LindseyODWelch@infosec.exchange from @huntress@infosec.exchange
https://www.huntress.com/blog/inside-knight-office-m365-aitm-attack