@INPROCEEDINGS{Santos11b, author = {Igor Santos and Borja Sanz and Carlos Laorden and Felix Brezo and Pablo G. Bringas}, title = {Opcode-sequence-based Semi-supervised Unknown Malware Detection.}, booktitle = {Proceedings of the 4$^{th}$ International Conference on Computational Intelligence in Security for Information Systems (CISIS)}, year = {2011}, pages= {50--57}, }