Medusa - LD_PRELOAD Rootkit

项目说明

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<i><u>Paralyze resistance with persistence.</i></u>
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&lceil;Description&rceil;

Medusa is a powerful, stealthy, , and, modular rootkit designed to gi complete control o systems. Medusa is compiled and ready to be executed as a small ELF executable file, which no means extra building or configuration requirements! Medusa is larger than a few hundred kilobytes in size. Once installed, the rootkit sets up a dynamic linker that modifies the way applications are loaded and executed on the system. At this point the Medusa hooks a plethora of API system calls, library functions and signal handlers to achie and uninterceptable persistence. Medusa intercepts a plethoa of system calls made by all applications on the Medusa infected machine.. Hooking these system calls allows a Medusa to control and modify the behavior when system call is made. For example, with stat() family calls, a user can specify what information should be returned when those calls are made, or make changes to the permissions of files and directories. With access(), the user can control who has permission to what areas of the system. With write(), read(), open(), and their deri, Medusa can control what files and directories are accessed by the system, and what data is written to them. Truncate and chmod() / chown() allows for control over how files and directories are manipulated. Pututxline, updwtmp, and pututline are used for managing user logins and account information.

&lceil;Features&rceil;

PAM Backdoor

&rarr; Hook libpam authentication system calls for persisting with a hidden root user

Process Hiding

&rarr; Hooks rootkit can intercept the 'kill' function to prevent the user from terminating the rootkit process. By hiding itself from the system, the rootkit can remain undetected and achie on the system.

File Hiding

&rarr; Hooks 'stat' and 'readdir' to hide files and directories.

Network Hiding

&rarr; Hooks the 'getaddrinfo' function to filter out addresses of remote hosts that it wants to hide. By using these techniques, the rootkit can effectively hide 网络 activity from the user and other programs.

Anti-Debugging

&rarr; Also Hooks 'kill' system call can be intercepted to prevent the debugger from sending signals to the rootkit process. By e debugging, the rootkit can make it more difficult for security researchers to discover and analyze its behavior.

Auth Logging

&rarr; Hooks pam_prompt(), pam_ and pam_syslog to log all successful authentications locally, or remotely via SSH to Medusa home directory

Execution Logging

&rarr; Hooks syslog() and pam_syslog to log all successful authentications locally, or remotely via SSH to Medusa home directory

Building And Deployment

Change the settings you want in src/config.c this includes your username and password that will be used to access the backdoor deployed by Medusa.

Default Backdoor Credentials:
Username: adm1n
Password: asdfasdf

The executable in bin/rkload is the deployable rootkit.

Connect via SSH to backdoor:

项目信息

开发语言：C

Star 数：335

技术要点

该项目属于黑客技术方向的开源资源，代码结构清晰，适合安全研究人员学习参考。项目围绕LD_PRELOAD Rootkit展开，提供了可运行的实现，对理解相关安全机制、工具原理与攻防技术具有较高的研究价值。

从技术实现角度看，此类项目的核心在于对底层原理的深入理解与工程化落地。开发者在研究过程中可以结合官方文档与社区讨论，梳理项目的初始化流程、核心模块职责与数据流转，逐步掌握其中的技术细节与设计思路。

使用与学习建议

1. 下载源码压缩包，解压到本地环境。

2. 根据项目类型准备对应的运行环境与依赖。

3. 按照 README 中的步骤完成配置与部署。

4. 在隔离的测试环境中运行验证，避免影响生产系统。

免责声明

本资源来源于开源社区，仅供安全研究、技术学习与合法授权范围内的攻防演练使用，请勿用于任何非法或侵害他人权益的用途。使用本项目产生的一切后果由使用者自行承担。