Validation Methods of Suspicious Network Flows for Unknown Attack Detection

摘要: The false rate of the detection methods which are based on abnormal traffic behavior is a little high and accuracy signature generation relatively low. Moreover, it not suitable to detect exploits generate its signature. In this paper, we have presented ZASMIN (Zeroday-Attack Signature Management Infrastructure) system, developed for novel network attack detection. This system provides early warning at moment attacks start spread block cyber by automatically generating that could be used security appliance such as IPS. adopted various technologies — suspicious monitoring, validation, polymorphic worm recognition, unknown Especially, validation functions in able cover 1) polymorphism, an encrypted code penetration operation step, 2) executables, any binary each 3) malicious string. And also, introduce two concepts validate pre- processing traffic. one attack-based other signature-based validation. These can reduce order check feasibility ZASMIN, installed real honeynet environment, then analyzed result about attack. Even though short-period analysis enough long attacks, confirmed some without well-known month. Such wide-spread vulnerabilities software add today's insecure computing/networking environment. Similar new networks applications discov- ered published daily basis. environment has given rise ever evolving field intrusion prevention. classification point view typical methodology, consider "zero- day" problem extension anomaly methodology. However, zero-day became more sophisticated faster spreading across network, differs from existing methodology researches. initial research field, was initiated (26), (31), (32) using content prevalence model considers propagation super including Code-Red, Slammer, etc. But signature, if look into recent trend attacks. For example, after Sasser occurred 2004, similar type markedly decreases. mainly E-mail, downloader, dropper, Therefore, researches (16) property similarity or repeatability traffic, effectiveness decreases, while static dynamic method packet gotten attention detecting software. Zeroday-Attack Sig- nature Infrastructure(ZASMIN) function network. also contain releasing attack, technologies, composed gener- ation. Some these functionalities implemented with hardware-based accelerator deal giga-bit speed therefore, applicable Internet back- bone bottle-neck high-speed enterprize loss After honey-net internet exchange (IX), results days. two-day