I just youtubed the track and to me it sounds like a lowpassed reese.
Basically a reese is a detuned saw-wave (there are VST plugins like the Hotelsinus Reese Bassline and NI Massive), used by a lot of drum'n'bass producers (it's roots are actually in early techno tracks, originally the sound was created with a Roland Juno-106 I believe)
To get it in NI Massive, from the top of my head; you open up a new patch, turn the unison to 3 and the pitch cutoff slider to 1/3ish in the "Voicing"-tab until the sound starts to "wave".
I've personally aped most of my reeses from watching Sub Focus' Computer Music masterclasses (they're on youtube too!)