Imagine super-advanced aliens who know nothing of humans because their only view of Earth is from light that left Earth billions of years ago.. perhaps even from light that left before Earth was formed. The aliens purposefully emit signals of some kind in every direction, in order to try to hack the computers of planets that take in those signals. Humans take in the signals via our telescopes, or in some other way, etc. And from there our computers become hacked (perhaps even our robots become hacked, if this takes place in an earth a few hundred years from now..) by them, even though the aliens knew literally nothing about us, and maybe the aliens no longer even exist by the time we receive the hacking signals they sent our way?
What do y'all think? Is it sci-fi plausible.. How might the "details" work?
Update: alternatively, what if the aliens were not located billions of light-years away, but only (say) thousands of light-years away. So, they could have observed the Earth from afar a few thousand years ago, and based on that information could attempt a hack of Earth today...?