Its a cover by Sepultura!
But one hell of a good one!
Its in dropped tuning I'm pretty sure it's in
either B or A
I could be wrong I tabbed it in C# and it sounds good! 

Tablature Legend
^=bend
T=tremolo pick
*=palm mute
~=let ring
H=hammer on
P=pull off

|-------------|------------------------|--------|
|-------------|------------------------|--------|
|-------------|------------------------|--------|
|--2--2--2--2-|--7^-------4/3--2--3----|-7~-----|
|--2--2--2--2-|--7^-------4/3--2--3----|-7~-----|
|--0--0--0--0-|--5^--0-0--2/1--0--1-x4-|-5~-----| 
   *  *  *  *        * *       *  

|---------------------------|--------|
|---------------------------|--------|
|---------------------------|--------|
|--------------4/3--2--3----|-3~---6-|
|--------------4/3--2--3----|-3~---6-|
|--3H4P3--0-0--2/1--0--1-x6-|-1~---4-| ------Verse riff
          * *       *

|----------------------------------------|
|----------------------------------------|
|----------------------------------------|
|--7~---7-7-7-7--7/9-9-9-9---12-12-11-11-|
|--7~---7-7-7-7--7/9-9-9-9---12-12-11-11-|
|--5~---5-5-5-5--5/7-7-7-7---10-10-9--9--| ------Chorus Riff
        * * * *

   T    T     T
|-----------------------------------|
|-------/15b--15b-15b--15b--15b-----|
|-12b/--/18b--18b---18b--18b--18b---| ----Keep them bent while picking
|-11b/--/17b------------------------|
|-----------------------------------|
|-----------------------------------| ---------Solo Riff////Find rythmn in the song  

RIGHT BEFORE ENDING VERSE
    T
|-------|
|---9---|
|--12---|
|-------|
|-------|

ENDING
|-------------|
|-------------|
|-------------|
|--2-2-2-2-2--|
|--2-2-2-2-2--|
|--0-0-0-0-0--|
   * * * * *