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Rootkit tw(0224)
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Chia-Hao Tsai
本文件介绍了Linux中的rootkit,包括其定义、目的和实现级别。rootkit可以用来隐藏信息,包含管理工具特性,并能够与其他恶意软件集成。文档还分别讨论了三种实现级别的优缺点及其示例。
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Rootkit tw(0224)
1.
Rootkit in Linux
hack-stuff
2.
Rootkit ● Rootkit 簡介
○ 概念與目的 ● Level 0 ○ 簡單但可能很有效的... ● Level 1 ○ 容易實作但也容易被發現... ● Level 2 ○ 十分有效...
3.
簡介 (接續) ● Rootkit
== 軟體 ○ 設計用來隱藏訊息 ○ 可以跟其他惡意軟體整合 ○ 也能用來保護(keyword: sony 藍光) ● Rootkit == 管理工具 ○ 原則上需要最高權限 ○ 也可以用來偷最高權限的資料 ○ 或許能用來繞過最高權限的檢查
4.
概念 ● 隱藏 ○
正在執行的程式 ○ 存在的檔案 ○ 網路流量
5.
在開始之前... Process
/bin/ls /proc/[pid] User-Space Kernel-Space ??? Structure
6.
Level 0 ● 重新包裝原本的程式
○ 使用直譯式語言 (bash/perl/python...) ○ 過濾資訊 ● 優點 ○ 實作簡單 ● 缺點 ○ 容易抓包 ● Demo ○ ...
7.
Level 1 ● 替換原本的程式
○ 在程式碼中加入自己的邏輯 ○ 提供程式原本的功能 ● 優點 ○ 完美過濾 ● 缺點 ○ 需要會寫程式(script kiddie out!) ○ 必須拿到原始碼 ● Demo ○ ...
8.
Level 2 ● 替換
kernel ○ 替換或移除掉 kernel 訊息 ○ 改變在 kernel 上實作的邏輯 ● 優點 ○ 幾乎找不到... ○ 修改所有訊息, 甚至可以假造訊息 ● 缺點 ○ 十分難實作 ○ 高度平台相關, 原則上不能跨平台! ● Demo ○ ...
9.
Ref ● Source code
○ https://github.com/cmj0121/HST- Course
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