Operophtera brumata - Fresh female
Almost all females that I see have most of their scales rubbed off - I'm guessing due to previous copulas where the males climb (stumble?) over the females and try to cover them with their wings. This one still seems to have most of her scales and hence looks very, very different from what I see most.
The winter moth is a moth of the family Geometridae. It is an abundant species of Europe and the Near East and one of very few Lepidoptera of temperate regions in which the adults are active in the depth of winter. The female of this species is virtually wingless and cannot fly, but the male is fully winged and flies strongly.