it is Sepultura's Arise
http://www.metalreview.com/Interviews/30160/Antti-Kokko-of-Kalmah.aspx
its near the middle
AK: [Laughs] Swamplord and stuff with the swamps we have. Every band has some kind of metal, so we decided [laughs] to play swamp metal. In the area we live, 60 percent of the soil is covered by swamps.
MR: The studio diary mentions one cover song, but not by name. I dont recognize any of the song titles from the promo copy as covers. Did that song you referred to there make it onto the album, or no?
AK: Its going to be on the Japanese import.
MR: Can you reveal which cover song it is?
AK: [Laughs] Its Sepulturas Arise.