It is pretty damn hard for any metal band to produce a song that is genuinely "creepy". I am not into much "dark metal" or "ambient" stuff, never appealed to me, and certainly does not strike me as creepy, even though that is the direction some responses were going.
Regardless, I guess there are two songs that come to mind:
"Hunted Ordure" - LUGUBRUM off there split w/Finsteris called "Al Ghemist"
"Hail Sathanas" - BEHERIT off "Oath of Black Blood" - very evil tune...
What is with that link someone posted? Good tune to download, or what?
Mike.