There is more than one artist with this name. 1) Malleus (Brazil) is a black metal band formed back in '04, responsible for songs like "Behated Unholy Order", "Beyond The Black Fog" and "Renegated By Sight", all from their demo "Into The Black Path".
More info about this especific Malleus can be found in their official website http://www.malleusbrasil.com/ 2) Malleus (Portugal) is an extreme satanist andanti-human black metal duo responsible by songs like "Império do Mal" (Evil Empire)...

Read more about Malleus on Last.fm.