help

7y or more ago I remember watching a horror movie , when I started looking for it based on what I remember I never managed to find it , i recall a little from the ending , the events happened on the daylight / it was rainy and foggy in … I wouldn’t call that a forest because I remember it was smaller than that , in front of a black castle , the characters where probably teens or in their 20s , so the story was a group of friends exploring or something like that and they ended up dying except one male survivor , one of the characters died after trying to hide inside a car and then it locked on her until she suffocated