Ending ruins and otherwise decent movie.

Now this is an ending that comes out of nowhere, and i dont mean it in a good way.

I had a good time with this movie up to the last 5 minutes, it balanced the line between a thriller and dark comedy without going into camp, everything was player seriously and with a sinister tone.
I expected her crimes to catch up with her, but no, she gets attacked by a random guy we never see who has no real motives for his actions and ... thats it.
Movie ends with no real closure on anything.

What a way to ruin a movie.