I was very little when I saw this horrifying at the time movie, so take what i describe with a grain of salt. I saw it between 1997-1999 on VHS but I believe the movie could be anywhere between the 70s and 1996. The events took place somewhere remote, far from big buildings, population and skyscrapers. A setting very similar to the movie Demonwarp (1988).
What I remember is a Bigfoot-sized monster, possibly hairy, coming out of the floor by breaking through the wooden floorboard, possibly in a cabin of sorts. The monster broke through behind an unaware woman who was sitting on a sofa or couch and hugged around her before dragging her down. That happened unexpectedly and i believe during the daylight with other people close by.
The monster had a red vision that was spying people with (it was seeing Crimson red), a bit similar to the Predator without the heat detection but more like the Night of the Demon (1980) creature and Pumpkinhead 2.
In addition a very ominous, diabolical theme was playing when the creature was stalking humans, which left a big impression on me and is one of the main reasons i want to find this movie.
I was under the impression that this monster came from space but i could be totally wrong about that.
After some debate a small group of people went to hunt it down in its underground lair that looked like a cave but had a hellish feel to it with possibly human skulls and lava.
I have searched many years for this movie and I can't find it. I've looked at all the horror movies of the 80s in the wiki. It's not a well known cult classic movie that's for sure.