I saw this 6 or 7 years ago and even then I thought it looked pretty old so I think it was made in the late 80s – early 00s. It was in color and it was in English.
The whole plot takes place in a rural area, with some forests and log houses. It probably takes place in the modern era. Somehow the creature (alien?) starts possessing other people in town and I vaguely remember the main character was a sibling or a family.
I remember one scene towards the end where the creature takes a form of a small black goo/blob and attacks the main female character from the crotch. I think she died.