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恶意软件开发 — 键盘记录器的运行原理拆解 一 第一部分构成条件

恶意软件开发 — 键盘记录器的运行原理拆解 一 第一部分构成条件

指导重温C/C++之恶意软件键盘记录器完整的开发步骤和运行原理拆解方法。


  声明:该系列目的在于研究键盘记录器的内部运行原理,从而进行更好的防御!禁止用于违法行为!同时也是为了从头掌握C/C++的完整系列一!


首先,恶意软件和其他程序一样,也只是一段代码。例如,如果你想编写一个无法被检测到的键盘记录器,首先应该了解一下普通游戏在 Windows 系统中的运行机制。比如,每次你在游戏中按下某个键(上、下、左、右、Ctrl 等),系统都会调用一个 Windows 句柄来捕获按键并根据按键执行相应的操作。所以,如果我能编写一个运行在后台的程序,代码与游戏相同,只需稍作修改,将按键记录存储在内存中,而不是执行游戏相关的操作,它就变成了一个键盘记录器。然后,我可以将其转换成一个模块,并将其推送到反向 shell,从而从远程机器上获取按键记录。

然而,在深入恶意软件领域之前,有一些先决条件。我们需要在开始之前做一些准备工作。以下是在编写恶意软件之前需要思考的一些最重要的问题:

  • C/C++    —难度:⭐⭐⭐

  • 汇编/Shell —难度:⭐⭐⭐⭐

在这里将全程使用 TCP 连接,但我们编写的恶意软件可以轻松移植到 HTTP。为了便于说明,本系列将编写投放器和无阶段恶意软件,因为编写有阶段恶意软件需要我们深入学习汇编语言、创建 shellcode 并将其发送到缓冲区执行。

但由于我们希望编写快速且相对简单的程序,我将使用 C 和 C++ 编写这些程序,并使用 Python 3 编写服务器代码。基于 C/C++ 的二进制文件体积非常小,而且在编写恶意软件的处理程序/服务器时,我们需要快速高效的编程语言,因此选择了 Python 3。我强烈建议不要使用 Python 或 Ruby/其他编写恶意软件,因为编译后的二进制文件大小会达到1 MB,而我们编写的恶意软件理想情况下应该小于 50 KB。

先决条件

以下是我认为要完全理解本系列中编写的代码所必需的一些技能:

1.C/C++ 

  1. 指针[用于在受害方内存中存储数据]

  2. TCP套接字[反向shell]

  3. 操作堆上的缓冲区[读取大文件]

2.Python 3 [服务器/处理器代码]

  1. 多进程/多线程 [多个机器人的处理程序]

  2. 使用数据结构处理数据类型

  3. TCP套接字

  4. 事件信号处理

3.WINAPI(Windows套接字)

4.Mingw-g++ 编译器标志/选项[用于减小二进制文件大小]

5.Elasticsearch 和 Kibana [用于可视化受损系统/用户、红队评估期间获得的权限]

搭建恶意软件测试研究环境所需的工具:

1.Linux(首选 Debian 系统,用于运行恶意软件处理服务器)

下载链接 – https://www.debian.org/

2.Windows [虚拟机 – 用于测试二进制文件]

3.Visual Code(用于编写 Python 和 C++ 代码)

下载链接 – https://code.visualstudio.com/download

在 Debian 系统中安装 Mingw 交叉编译器:

$ apt-get install mingw-w64-common mingw-w64-i686-dev mingw-w64-tools mingw-w64-x86-64-dev

Windows 系统进行开发,则可以从这里下载 Mingw 编译器:

https://sourceforge.net/projects/mingw/files/

合集:用于记录一些 恶意软件研究与开发的故事!重温C/C++

根据文章点赞人数决定,是否继续扩展更新更多的拆解文章!

#恶意软件开发

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.001083s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001596s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000729s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000615s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001381s ]
  6. SELECT * FROM `set` [ RunTime:0.000563s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001366s ]
  8. SELECT * FROM `article` WHERE `id` = 729876 LIMIT 1 [ RunTime:0.001349s ]
  9. UPDATE `article` SET `lasttime` = 1781068838 WHERE `id` = 729876 [ RunTime:0.011825s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000309s ]
  11. SELECT * FROM `article` WHERE `id` < 729876 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000506s ]
  12. SELECT * FROM `article` WHERE `id` > 729876 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000383s ]
  13. SELECT * FROM `article` WHERE `id` < 729876 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003367s ]
  14. SELECT * FROM `article` WHERE `id` < 729876 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005971s ]
  15. SELECT * FROM `article` WHERE `id` < 729876 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001896s ]
0.125705s