One person on reddit mentioned that there seems to be a correlation between the drifter invasions and the presence of a drifter wormhole. This information is unverified and uncorroborated however.
If it’s true than the best defense would be to roll the wormhole shut.
Also in suitonia’s stream yesterday several folks in chat suggested the drifters can be led away from a structure by simply warping on grid with them and then warping off, and they may follow you.
I know with reasonable certainty that if you go into a drifter wormhole and then leave you become “marked” and the drifters will chase you, sometimes even jumping gates.
Much of this is basically hearsay, but at the moment that’s all we really have.
-they can scramble from extreme range, at least 100km. Some players are reporting 500km scrams.
-they can apply their damage from equally long ranges and with near perfect tracking
-they’re extremely aggressive
So basically, don’t try to fight them. If you see them on grid, run.