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研究生： 洪健豪
Hung, Chien-Hau
論文名稱： 一個使用機器學習分析網路流量特徵的殭屍網路檢測系統
A Botnet Detection System Based on Machine-Learning using Flow-Based Features
指導教授： 孫宏民
Sun, Hung-Min
口試委員: 顏嵩銘
Yen, Sung-Ming
曾文貴
Tzeng, Wen-Guey
學位類別： 碩士
Master
系所名稱：
論文出版年： 2017
畢業學年度： 105
語文別： 英文
論文頁數： 38
中文關鍵詞： 殭屍網路 、流量特徵 、偵測系統 、機器學習 、特徵選取 、J48
外文關鍵詞： botnet, flow-based, detection system, machine learning, feature selection, J48
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    • 殭屍網絡一直是強大的網絡安全威脅。如今，當物聯網（IOT）成為一個重要
    的議題時，智能設備（有連接網路的設備）的增長率每年都有超過15％的增長，
    當中會有許多設備安全是充滿疑慮的，因此殭屍網路的快速成長將成為更大的問
    題。PC 的防毒軟體雖然已經發展了很長的時間但問題仍然很多；智慧型手機的
    安全問題才剛剛開始幾年，更不用說智能設備或是物聯網仍然正在發展，當中的
    安全議題更是充滿不確定性，所以可以預見會有更多的設備成為殭屍網絡的一部
    分。
    在本論文中，我們提出了一種透過分析網路上的封包來檢測潛在的殭屍網絡。
    它將各個流量的統計信息分組，然後提取每個組的行為模式進行機器學習。該系
    統將能用於分析p2p 架構的殭屍網絡，另外它將提取資訊到應用層，所以使用
    http 協定溝通的殭屍網絡也會分析。

    Botnets have always been a formidable cyber security threat. They are growing rapidly nowadays when the Internet of Things(IOT) has become an important issue and the number of internet-connected smart devices has increased by more than 15% annually. Although PC antivirus solution has been developed for a long time, it is still problematic. And the security issue of smart phones has just come into the spotlight in the near few years, not to mention the fact that smart devices and IoT are still at their growing stages. As such, security issues of the smart devices are full of uncertainty. In the foreseeable future, more devices will become a bot of botnet.
    In this thesis, we propose a system for detecting potential botnet by analyzing the flows on the Internet. The system classifies similar flow traffic into groups, and then extracts the behavior patterns of each group for machine learning. The system not only can analyze p2p botnets but also extract the patterns to application layer, it can analyze botnets using http protocols.

    Table of Contents .......................................................................................... i List of Figures ................................................................................................ iii Chapter 1 Introduction.............................................................................. 1 1.1 Motivation........................................................................................... 2 1.2 Our Contribution ................................................................................ 3 1.3 Organization ....................................................................................... 3 Chapter 2 Background ............................................................................... 4 2.1 Botnet ................................................................................................. 4 2.1.1 Botnet Introduction ............................................................. 4 2.1.2 Client-Server Botnet............................................................. 4 2.1.3 P2P Botnet .......................................................................... 5 2.1.4 Internet of Things with Botnet ............................................ 6 2.2 Machine learning................................................................................. 7 2.2.1 Flow based ........................................................................... 7 2.2.2 WEKA Introduction............................................................. 7 2.2.3 Machine Learning................................................................. 8 2.2.4 Classifier - J48 Decision Tree ............................................... 8 2.2.5 C4.5 Algorithm [1]................................................................ 8 2.2.6 Features selection ................................................................. 9 Chapter 3 Related Works.......................................................................... 11 3.1 Related Paper ..................................................................................... 11 3.2 Tools ................................................................................................... 12 Chapter 4 System Architecture and Design.......................................... 13 4.1 Goal .................................................................................................... 13 4.2 System Framework.............................................................................. 13 i 4.3 Features............................................................................................... 15 Chapter 5 Implementation ........................................................................ 19 5.1 Preparation ......................................................................................... 19 5.1.1 Requirement ......................................................................... 19 5.1.2 Data set................................................................................ 20 5.2 Preprocess ........................................................................................... 20 5.2.1 parsing packets ..................................................................... 20 5.2.2 construct flow and conversation ........................................... 22 5.2.3 calculate features for machine learning ................................ 23 5.2.4 Noise algorithm .................................................................... 25 Chapter 6 Evaluation ................................................................................. 27 6.1 Experiment Design.............................................................................. 27 6.1.1 Purposes............................................................................... 27 6.1.2 Experiment process .............................................................. 27 6.2 Evaluation........................................................................................... 28 6.3 Comparison ......................................................................................... 31 Chapter 7 Conclusions ............................................................................... 34 7.1 Conclusion........................................................................................... 34 7.2 Future work......................................................................................... 34

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