On behalf of the Program Committee, it is our pleasure to present the p- ceedings of the 6th GI International Conference on Detection of Intrusions and Malware, and Vulnerability Assessment (DIMVA). Since 2004, DIMVA annually brings together leading researchers and practitioners from academia, government and industry to present and discuss novel security research. DIMVA is organized by the Special Interest Group Security-Intrusion Detection and Response (SIDAR)-of the German Inf- matics Society (GI). The DIMVA 2009 Program Committee received 44 submissions from ind- trial and academic organizations from 17 di?erent countries. Each submission was carefully reviewed by at least three Program Committee members or ext- nal experts. The submissions were evaluated on the basis of scienti?c novelty, importance to the ?eld and technical quality. The ?nal selection took place at the Program Committee meeting held on March 23, 2009, in Brussels, Belgium. Ten full papers and three extended abstracts were selected for presentation and publication in the conference proceedings. TheconferencetookplaceduringJuly9-10,2009,atVillaGallia,LakeComo, Italy, with the program grouped into ?ve sessions.
Two keynote speeches were presented by Richard A. Kemmerer (University of California, Santa Barbara) and HenryStern (Ironport/ Cisco).The conferenceprogramwascomplemented by the Capture-the-Flag contest CIPHER (Challenges in Informatics: Progr- ming, Hosting and ExploRing) organized by Lexi Pimenidis (iDev GmbH) and a rump session organized by Sven Dietrich (Stevens Institute of Technology). A successful conference is the result of the joint e?ort of many people. In particular, we would like to thank all the authors who submitted contributions.