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Download Gaining Big Picture Awareness in Enterprise Cyber Security Defense Pdf

Gaining Big Picture Awareness in Enterprise Cyber Security Defense false
By:Jun Dai
Published on 2014 by


Cyber security is nowadays facing |a sea of sensed data|, especially in the enterprise environment. All the information technologies in enterprise security deployment, such as firewalls and the various intrusion alert systems, contribute their data in disparate format to the sea. Detecting and preventing intrusions in cyber space is like |catching big fishes in the sea|. Like fishermen, we need a well-knit |fishing net| to capture cyber attacks. As researchers, we first propose an interconnected enterprise-level and multiple-layer model called SKRM (Situation Knowledge Reference Model). This model seamlessly integrates different abstraction layers of cyber situation knowledge in an enterprise network, and serves as the fishing net. It breaks the |isolation| in-between heterogeneous data sources, and enables a |big picture| to deliver the macroscopic perspective and holistic understanding.Using SKRM as a reference model helps us identify problems that were not well addressed or even didn't get recognized in previous research work. Three such problems are identified: the zero-day attack path problem, the network service dependency discovery problem and the challenges to traditional cyber security diagnosis. This paper then presents solutions to them as three systems. The first system is named Patrol to correctly and efficiently identify zero-day attack paths. The second system is called Snake to accurately and quickly discover the network service dependencies. The third system is named X-ray to raise alerts in a profile by taking X-ray pictures for cyber-attacks in a fine-grained and cross-machine way.All the three systems' design benefits from the cross-layer paradigm of SKRM. With their soul rooted in SKRM, the idea and design evolve from system to system. At the same time, all systems contribute to the whole construction of SKRM-enabled big picture situation awareness. Specifically, Patrol constructs the network-wide system object dependency graph as the OS Layer graph, Snake further generates the network service dependency graph as the App/Service Layer graph, and X-ray further correlates alerts with the system object dependency graph (OS Layer) at the points of policy violations.

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