This is the main Bass riff with slight variations throughout. Hope it helps.
G|---------------|---------------|---------------|---------------|
D|---------------|---------------|---------------|---------------|
A|-0---0---------|-0---0---------|-0---0---------|-0---0---------|
E|-------0--3--4-|-------0--0-3--|-------0--3--4-|-------0--0-3--|
G|-----------------|-----------------|-----------|------------------|
D|-----------------|-----0-4---------|-----------|--------------0-2-|
A|0---0------------|-----------5-0---|-----------|--------0-2-3-----|
E|------0--3-5-4-3-|-2-------------2-|-0----2----|-3----4-----------|