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研究生： 彭士家
Shi-Jia Peng
論文名稱： 使用Openflow 交換器偵測Botnet 受害者與通知機制
Botnet Victim Detection and Notification based on Openflow Switch
指導教授： 曾黎明
Li-Ming Tseng
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 資訊工程學系
Department of Computer Science & Information Engineering
畢業學年度： 98
語文別： 中文
論文頁數： 57
中文關鍵詞： Openflow 、封包轉向 、NetFPGA 、殭屍網路
外文關鍵詞： Botnet, Openflow, redirect, NetFPGA
相關次數： 點閱：6  下載：0 
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    • 隨著網路不斷的發展，網路上的資料越來越重要，網路交易也越來越頻繁。
    同時網路犯罪開始興起，而殭屍網路（botnet）就是其中一種。殭屍網路有攻擊
    者隱密、且彈性大的特性，而且能夠一次對多台電腦進行控制。
    本篇論文以IRC 協定的botnet 為研究對象，首先說明botnet 的運作機制，
    和botnet 對於資安人員難以解決的問題。接著介紹由史丹佛大學開發的NetFPGA
    網卡和openflow 計劃的特色及優點，並說明用linux gateway 來阻擋的效率問題。
    本篇論文透過史丹佛大學設計的NetFPGA 和openflow 網路，設計了一套可以使
    用openflow switch 來偵測已中毒的電腦。我們假設正常使用者皆會瀏覽網頁，
    利用openflow switch 將中毒的電腦導向至一個警告頁面，告知使用者中毒資訊，
    再透過網路的封鎖策略，讓使用者了解解決中毒情況的必要性和急迫性。

    Over the years, the network developed quickly and constantly. Because the rise
    of trade networks, data on the network become more and more important.
    Unfortunately, the rise of internet crime became a big problem at the same time such
    as Botnet. Botnet have hidden attackers, and the characteristics of high flexibility, but
    also an ability to control multiple computers.
    This paper describes the IRC-based botnet. First, we explain the botnet behavior
    and the hard to solve problems for security officer. Then we introduced the NetFPGA
    card developed by the Stanford University and explained the openflow project
    features and advantages. These devices are used as a linux gateway to be an efficient
    firewall. This paper use the NetFPGA card and openflow network project designed by
    Stanford University to detect bot in the botnet. Assume that normal users browser web
    everyday, we use openflow switch redirect the bot traffic to a particular page that
    show the warning information. Then through the network disconnected strategy, we
    try to let the user know the necessity and urgency.

    第一章 簡介 ............................................................................................................... 1 1.1 研究背景.................................................................................................... 1 1.2 研究動機.................................................................................................... 5 1.3 論文架構.................................................................................................... 6 第二章 相關研究 ....................................................................................................... 7 2.1 偵測botnet 的方法 ...................................................................................... 7 2.2 利用Honey Pot 來取得可疑C&C 名單 ..................................................... 7 2.3 透過封包分析偵測並瓦解殭屍網路........................................................... 8 2.4 Ethane ......................................................................................................... 10 2.5 Openflow ..................................................................................................... 12 第三章 問題分析與對策 ......................................................................................... 14 3.1 針對botnet 的bot 部份進行阻擋 ............................................................. 14 3.2 使用linux 閘道與NetFPGA 的差異性 ................................................ 14 3.3 如何通知使用者中毒資訊......................................................................... 15 3.4 導向通知頁面............................................................................................. 16 3.4.1 利用DNS 導向[8] ........................................................................... 16 3.4.2 利用DNS 的WPAD RECORD ................................................... 17 3.4.3 利用Transparent Proxy 導向 .......................................................... 17 3.5 中毒後之網路封鎖策略............................................................................. 18 3.6 使用者已解毒之判定................................................................................. 18 3.7 總結............................................................................................................. 19 第四章 系統設計 ..................................................................................................... 20 4.1 系統設計之假設......................................................................................... 20 4.1.1 使用者皆會使用www 服務之假設 ............................................... 20 4.1.2 使用honeypot 誘捕系統蒐集到可疑位址之假設 ........................... 20 4.2 實驗架構..................................................................................................... 21 4.3 系統流程..................................................................................................... 23 4.4 規劃中毒封鎖策略..................................................................................... 24 4.5 中毒通知頁面設計 .................................................................................... 26 4.6 規劃解毒之判定......................................................................................... 26 第五章 系統實驗與分析 ......................................................................................... 28 5.1 實驗環境..................................................................................................... 28 5.2 系統架設..................................................................................................... 29 5.3 封包過濾與轉向......................................................................................... 31 5.3.2 紀錄封包資訊.................................................................................. 32 5.3.3 將特定來源封包轉向...................................................................... 34 5.3.4 通知使用者中毒資訊...................................................................... 34 5.3.5 中毒期間將封包轉向且紀錄封包.................................................. 36 5.3.6 阻擋特定來源封包.......................................................................... 38 5.4 效能分析..................................................................................................... 39 5.5 實驗結果與討論 ........................................................................................ 42 第六章 結論與未來工作 ......................................................................................... 43 參考文獻 ……………………………………………………………………………..44

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