Certain embodiments of the present invention provide methods and systems for software classification. Certain embodiments provide a method for identification of malware. Certain embodiments provide a method for identification of unwanted software. The method includes identifying one or more functional blocks and/or properties of software. The method further includes identifying genes in the functional blocks and/or properties. The method also includes matching the resulting list of genes against one or more combinations of classifications of groupings of genes. Additionally, the method includes classifying the software. Certain embodiments provide a method for generating classifications. The method includes identifying functional blocks and/or properties. Furthermore, the method includes combining a plurality of genes to form a classification.