Quite frankly, there is simply too much here. It is a massive wall of text that describes every detail of 965 in a very uninteresting way. It's like you wrote 965, thought to yourself, "Hmmm. This isn't creepy enough" and began piling on details.
It stares at you through the window, making you paranoid. Oh, and it also can move between windows. Oh, and it also starts cutting people in their sleep. Oh, and these cuts turn out to make runes of some kind. Oh, it also engraves the final rune in your heart. Oh, it also seems to be getting stronger each time it kills some one.
I love the idea of a creepy guy staring at you through your window who makes you piss blood. Everything else seems too much. I would be in favor of seeing this SCP stripped down. Less is more.
Edit: And the [DATA EXPUNGED] doesn't add to the creep factor without any hints. As it is, it seems like a bit of a cop-out.