That sounds alot like a violin does if you just rake the bow at a retarded angle across the strings, with a timpani or some other kind of thud behind it.
If it was done with synthesizers the thud was done easily... and the stringy part was probably done using some high resonance squarewave with fast PWM, filtered somehow... (if it was analog synths)
if it was FM, I imagine they just messed around awhile til it sounded like they wanted...
that or they used samples from some kind of synth (like a Roland MT-32) and just applied effects and messed with it... it almost sounds like they reversed a different sound, and applied flange to it.