I was quite young (toddler) when I saw this so my memory's might be quite fuzzy.
It was seen in either late 80's or very early in the 90's.
The movie was about a monster/alien creature that would kidnap people, than use a sort of tentacle connected to its right arm that would strike the victims in their chest, and suck blood out of it, then collect the blood in tiny vials in an apparatus on its arm, some sort of high-tech gauntlet.
The movie might however been older, since my siblings enjoyed other movie content, but my only clue temporal wise is from when I saw it.
What's clouded to me, so take this part with a grain of salt, is that the creature was brownish, probably a bronze-ish metal suit.
A scene I clearly remember was a woman being bound, her shirt being ripped open by the creature's hands, and then the tentacle like appendage striking her in the middle of her sternum.
I'll update this question once I remember more details.