A simple riff in the C-minor pentatonic scale (5th position).

Intro
(This is riff is played in most parts of the song as well) 
e|---------------------------------|
B|----------11b13-11-8----8--------|
G|-----8-10------------10-----(x3)-|
D|-s10-----------------------------|
A|---------------------------------|
E|---------------------------------|

e|-----------------------------------------|
B|----------11b13-11-8----8----8----8----8-|
G|-----8-10------------10---10---10---10---|
D|-s10-------------------------------------|
A|-----------------------------------------|
E|-----------------------------------------|

Feel free to add some licks in the C-minor pentatonic scale, sounds brilliant:
|----1-----3--------6-----8---------11-|-----13------15----------18------20----------23-|
|----1--------4-----6-----8---------11-|-----13----------16------18------20----------23-|
|-0--------3-----5--------8-----10-----|-12----------15------17----------20------22-----|
|----1-----3-----5--------8-----10-----|-----13------15------17----------20------22-----|
|----1-----3--------6-----8-----10-----|-----13------15----------18------20------22-----|
|----1-----3--------6-----8---------11-|-----13------15----------18------20----------23-|