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Operophtera brumata
Grey moth of some kind, wingspan of about 20-25mm.
Found it on the wall of my apartment building, most likely resting on threes of the same color as the moth, it was cold outside so it took a pitstop on the wall to wait for better temperatures.
Thank you Fyn Kynd for your suggestion, it seems you are right. I didn't take the measurement of the species accurately so it probably was larger than what I estimated.