1 - A family moves to a mysterious house.
2 - Something wrong with the attic! Noises come from attic.
3 - The scene i remember best: The man goes to attic and there's a locked door and strange object near it in the attic. The light shines on that object so that shadow of that strange object appears on the door like a finger pointing that door.
4 - At the end, the monster like yeti, ogre or something comes out from that hidden room behind the locked door. I remember that the electricity goes out and in the dark, we hear the footsteps of the monster coming downstairs!
Could be the Swedish horror flick The Visitors - new house, creepy attic, locked room, big footstep noises, monster.
does the"monster" save the family from the bad guys?
This description kind of reminds me of Poltergeist.