You could make that by making very blocky animated Fractal Noise and then use something to cut it out in bands like that. You could use masks, a shape layer or, heck, another layer with really large Fractal Noise as a track matte.
- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')
No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.