There's a funky little riff going on here, which is probably for the bass but you'll 
no problem with it on the guitar too with the aid of a few effects.

Listen to the song to get the timing of the hammer-ons right.

    E|----------------------------------------|
    B|----------------------------------------|
    G|----------------------------------------|       *Repeat*
    D|---------------------6--4--3--1---------|
    A|----6--4--3--1-------------------4h6----|
    E|----------------3h4---------------------|

Short but sweet.
This carries throughout the rest of the song, pretty much.