Boost CTF Performance with Alien: A Modular Webshell Management Client
Alien is an open‑source, modular Webshell client that centralizes file management, virtual shells, database access, pivoting, encrypted traffic and plugin support for multiple scripting languages, dramatically speeding up CTF Webshell challenges while remaining lightweight and extensible.
Project Overview
Alien is a modular Webshell client for security research and CTF competitions. It separates the lightweight Webshell (OneShell) that only executes arbitrary code from advanced capabilities provided by separate modules.
Core Components
OneShell – minimal Webshell responsible solely for code execution.
NebulaPulsar – memory injector supporting Java and .NET reflective loading.
DarkMatter – payload executed by NebulaPulsar.
Event Horizon – HTTP traffic obfuscation framework enabling wrapper injection and script tampering.
DriftingComet – Webshell pivoting mechanism for multi‑hop communication.
Supported Script Languages
PHP v5.x – Linux/Windows – executed via OneShell – standard payload.
PHP v7.x/v8.x – Linux/Windows – OneShell with ECDH – standard payload plus elliptic‑curve key exchange.
ASP – Windows – OneShell – standard payload.
ASPX/ASHX/ASMX – Windows – JScript – OneShell.
JSP – Linux/Windows – Nashorn – OneShell, NebulaPulsar.
JSPX – Linux/Windows – Nashorn – OneShell, NebulaPulsar.
CFML – Linux/Windows – NebulaPulsar – DarkMatter.
Perl – Linux/Windows – CGI – OneShell.
Ruby – Linux/Windows – CGI – OneShell.
Main Features
File Manager – graphical browsing, upload, download, and edit of target files.
Virtual Shell – interactive command execution on the target server.
Database Manager – connect to and query target databases.
Arbitrary Code Execution – run any code through the Webshell.
SOCKS5 Proxy – establish a SOCKS5 tunnel for internal network penetration.
Plugin System – extend functionality with custom modules.
Webshell Pivoting (DriftingComet) – multi‑hop communication to traverse layered networks.
HTTP Traffic Obfuscation (Event Horizon) – encrypt and disguise traffic to evade log detection.
Reflective Loading (NebulaPulsar & DarkMatter) – load .NET and Java payloads directly in memory, leaving no file traces.
Installation & Usage
Environment Requirements
Python 3 (added to system PATH)
Verify installation:
python --versionQuick Start
Clone the repository: git clone https://github.com/iss4cf0ng/Alien.git Enter the directory: cd Alien Run the main program:
python Alien.pyRepository
https://github.com/iss4cf0ng/Alien
Signed-in readers can open the original source through BestHub's protected redirect.
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