Balduzzi, MarcoCavallaro, LorenzoDell'Amico, MatteoFattori, AristideNappa, Antonio2010-08-102010-08-102010-08-10http://hdl.handle.net/2003/2735210.17877/DE290R-643en004Take a Deep Breatha Stealthy, Resilient and Cost-Effective Botnet Using Skypeconference contribution