A Study of Native API Protection Mechanism against Malicious Codes in Windows Kernel Mode

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研究生：	王勛
論文名稱：	A Study of Native API Protection Mechanism against Malicious Codes in Windows Kernel Mode 於視窗系統核心模式中阻止惡意程式的保護機制之研究
指導教授：	孫宏民
口試委員:
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 資訊系統與應用研究所 Institute of Information Systems and Applications
論文出版年：	2008
畢業學年度：	96
語文別：	英文
論文頁數：	46
中文關鍵詞：	惡意程式、核心模式
相關次數：	點閱：3 下載：0
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越來越多的弱點在視窗作業系統上被發現，也出現許多惡意程式
碼利用這些已公佈的弱點在網路上蔓延。相對於使用的特徵辨識為基
礎的防禦機制而言，對於攻擊程式的異常行為的偵測被認為是較有效
率的一種方法。目前已經有多種針對程式異常行為的偵測方法被提出
來。但多數的偵測方法都是針對高階的API(Application Programming Interface)來辨別是否有異常的呼叫。但是這樣的防禦機制並無法對
直接取用系統呼叫(system call)的惡意程式碼有任何抵擋的效果。
在本篇論文中，我們提出一個針對於直接取用系統呼叫的惡意程
式碼的防禦架構。我們將架構放置於作業系統核心模式中，這是一個
一般惡意程式碼不容易取得控制的區域，在此將程式導向檢查的函
式。我們的系統經過一系列的實驗及安全性分析，對於現實存在的惡
意程式碼能有效的阻擋，並且對於系統效能的影響不大。

Table of Contents ......................................................................................................... I
List of Figures............................................................................................................... III
List of Tables ................................................................................................................ V
Chapter 1 Introduction .............................................................................................. 1
Chapter 2 Background ............................................................................................... 4
1 Native APIs................................................................................................... 4
2 Shellcodes ...................................................................................................... 5
3 Hooking Methodology ................................................................................... 8
3.1 API Hooking in User Mode ............................................................ 8
3.2 System Call Hooking in Kernel Mode............................................. 12
4 Windows System Call.................................................................................... 16
4.1 introduce of Invoking System Call .................................................. 16
4.2 Proposed Protection Mechanism on Windows System Call............ 17
Chapter 3 Related Work ............................................................................................ 18
1 Static Source Analysis................................................................................... 18
2 Compiler Patch ............................................................................................. 19
3 Shellcodes Simulation.................................................................................... 20
4 Virtual Machine Based.................................................................................. 21
5 API and System Call Hooking ...................................................................... 22
6 Summary....................................................................................................... 23
Chapter 4 Approach................................................................................................... 25
1 Overview ....................................................................................................... 25
2 Monitor ......................................................................................................... 27
3 Hook.dll......................................................................................................... 28
4 The Pre-validation Function ......................................................................... 29
5 Driver ............................................................................................................ 30
6 Validation Function....................................................................................... 33
Chapter 5 Experiment and Analysis .......................................................................... 34
1 Experiment.................................................................................................... 34
2 Performance Overhead Evaluation ................................................................ 35
Chapter 6 Discussion.................................................................................................. 37
1 Security Analysis........................................................................................... 37
2 Comparison with Nguyen's scheme ............................................................... 38
3 Load Time Overhead Reduction ................................................................... 39
4 Multi-processes and Multi-threading............................................................. 39
5 Whole Native APIs Hooking ......................................................................... 40
6 False Positive................................................................................................. 41
7 APIs Level..................................................................................................... 41
Chapter 7 Conclusion................................................................................................. 42

                                

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