Not sure about the tuning (may be dropped D) but this main riff only uses the higher 
strings anyway

Key:
p-pull off
~-vibrato
h-hammer on

First part
E|-12p11-7-9----------------7----12p11-7-9------------7-|
B|-----------7-7-7-7-7-9-10----------------7-7-7-9-10---|
G|----------------------------9~------------------------|
D|------------------------------------------------------|
A|------------------------------------------------------|
E|------------------------------------------------------|

Second part
E|-12p11-7-9----------------7----12p11-7-9------------7p5-3h5-|
B|-----------7-7-7-7-7-9-10----------------7-7-7-9-10---------|
G|----------------------------9~------------------------------|
D|------------------------------------------------------------|
A|------------------------------------------------------------|
E|------------------------------------------------------------|