Alien Stowaway Horror Movie

About 10 years ago my brother and I were flipping channels and we came across a movie that we have been looking for ever since. All we really remember is that some kind of slimy alien was stowed away on some spacecraft that humans brough back to earth (possibly the lunar lander) and no one notices it until it starts to kill them all. It took place at NASA headquarters or something and I specifically remember a scene where the alien is hiding in the ceiling of a bathroom and kills someone in a stall – does anyone have any idea of what movie this might be?

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