Standard tuning
Capo 1st fret
Relative to capo

Riff 1

E|-----------------------------------------------|
B|------5---------5------------5---------5-------|
G|----4--4------4--4--------4--4------4--4-------|
D|---6-----6---6----6-----6-----6----6-----------|
A|--4---------0----------------------------------|
E|-------------------------0----------0----------|

Riff 2

E|-------------------------------------------------|
B|------5----------5-----------5---------5---------|
G|----4--4------4---4-------4--4-----4---4---------|
D|---6----6---6-------6----6----6---6--------------|
A|--4--------0-------------2--------2--------------|
E|-------------------------------------------------|

Riff 3

E|---------------------------------------------------|
B|------5----------5------------5------------5-------|
G|----4--4------4---4--------4--4--------4---4-------|
D|---6----6---6-------6----6------6----6-------------|
A|--0--------2------------4-----------4--------------|
E|---------------------------------------------------|

Im not so sure about riff 3, it fits but it might not be exactly whats played.
Hope i helped, there wasnt a tab on the whole internet before so at least its better than nothing.
Please rate