So like I was saying in the comments. I think this is an FM based synth stab. I started to make one in FM8 (by native instruments). So I have a one oscillator with a slow attack at a 1 ratio and another feeding into it at a 3 ratio, with a slightly faster attack. Then I put on a shelving filter to cut out all the low end, and added a fat reverb on 100% wet. It's pretty close, but could use a bit more tweaking.
Alternatively, I was thinking that it sounds quite a bit like an electric drill which has been modified. If you go on a free SFX site, you can find an electric drill, EQ out all the low end, add in some reverb, and have a high-pass filter that opens slowly as the sample is played.