Trapcode 3D Stroke is good for making results like that.
Everybody is assuming you're talking about the light streaks, but if you're talking about the box, it looks like a precomp with Fractal Noise and a blur effect on a solid inside it. Then the precomp is either scaled down or masked off.
Or, are you talking about the lens flare? That could be any of a number of lens flare plugins (Optical Flares, Knoll Light Factory, etc.) or even just a layer in After Effects since I only see the main flare image and none of the other lens elements.