Probably done using a synthesiser, but sounds good on bass :)

Riff 1
G-------------------------------------------------|
D-------------------------------------------------|
A-6-6-6-6-6-6-6-6-8-8-8-8-8-8-8-8-3-3-3-3-3-3-3-3-|
E-------------------------------------------------|

Riff 2
G-------------------------------|
D-------------------------------|
A-----------------5-5-5-3-3-3-3-|
E-3-3-3-3-5-3-3-5---------------|

Riff 3
G-----------------------------------------------------------|
D-----------------------------------------------------------|
A-----------------------------------------------------------|
E-3-3-3-3-3-3-3-3-3-3-6-8-9h10-6-6-6-6-6-6-6-0h3p0-6-6-5-4--|

Riff 4
G---------------------------------------------------|
D---------------------------------------------------|
A-8-6-6-6-6-6-6-6-6-8-8-8-8-8-8-8-8-3-3-3-3-3-3-3-3-|
E---------------------------------------------------|


Put some more riffs on soon