How to get rid of moon stations?

I have a story where a powerful outside force killed (next to) all humans on earth some decades ago.

The way I want to build it is that it required that the human outposts on the moon to die as well. Unfortunately I want to have the reason of the dying be connected to the air on planet earth. (Kind of a reverse War of the Worlds ending.) But the outposts would have air filters and other high tech stuff available that should have prevented that.

The aliens would strongly prefer to never interact with humans at all; they prefer killing from distance (like the air thing where they introduced a created pathogen). It's okay if there are some dozen survivors - just not enough to make humans relevant for a long Long time. Just sending rockets would not do as the stations are hardened against asteroids, etc. (After all, they are permanent outposts, meant to last.)

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How to get rid of moon stations?

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