It's probably not a single project, but the insights of many projects for years, finally merged on one that took a long time as well.

For the 0days, probably.

But even the integration is impressive.

I think devising this plan altogether was a huge investment in time and patience. Consider the social engineering feats needed to get your hands on the driver signature cerificates, for example. And that's just one step in the entire sequence of lateral movement.