IT security community is recently facing a change of trend from closed to open working groups and from restrictive information to full information disclosure and sharing. One major feature for this trend change is the number of incidents and various Indicators of compromise (IoC) that appear on a daily base, which can only be faced and solved in a collaborative way. Sharing information is key to stay on top of the threats. To cover the needs of having a medium for information sharing, different initiatives were taken such as the Open Source Threat Intelligence and Sharing Platform called MISP. At current state, this sharing and collection platform has become far more than a malware information sharing platform. It includes all kind of IoCs, malware and vulnerabilities, but also financial threat or fraud information. Hence, the volume of information is increasing and evolving. In this paper we present implemented distributed data interaction methods for MISP followed by a generic scoring model for decaying information that is shared within MISP communities. As the MISP community members do not have the same objectives, use cases and implementations of the scoring model are discussed. A commonly encountered use case in practice is the detection of indicators of compromise in operational networks.
@cite_1: This paper provides a case study for information sharing within a public private not-for-profit partnership organization called ACTRA -- Arizona Cyber Threat Response Alliance, Inc.. This initiative is comprised of public and private entities, with government agencies as invited guests, aligned around the goal of improved response to cyber security events. Technical, political, legal and organizational issues arise when multiple parties attempt to exchange information in a formal setting. Benefits and specific solutions developed are discussed. The study concludes with several areas for future improvement and investigation, as well as recommendations for newly forming sharing groups.
A case study on information sharing is presented in @cite_1 , where a survey was performed on different aspects as hurdles, problems and legal aspects in information sharing. The major outcome was that information sharing remains a group or community activity. Another interesting outcome of this survey was the need for accurate information sharing practices and low false positive rates.