B374k.php |link| Here

is a popular and powerful PHP-based web shell used by both system administrators for remote management and cyber attackers as a backdoor. It packs a comprehensive suite of administrative and hacking tools into a single file, allowing a user to control a web server entirely through a browser. Kali Linux Core Capabilities

The script is designed for extreme efficiency, requiring no installation while providing features typically found in a full operating system: File Management:

View, edit, rename, delete, upload, and download files directly on the server. Command & Script Execution:

Run system commands (via terminal) or execute scripts in languages like Python, Perl, Ruby, Java, and Node.js Database Connectivity: Connect to and manage databases including MySQL, MSSQL, Oracle, and PostgreSQL through an integrated SQL Explorer. Networking Tools: Establish bind or reverse shells b374k.php

, craft network packets, and send emails with local file attachments. Process Control:

A built-in task manager to view and kill active system processes. Security and Usage Authentication: Access is password-protected; the default password is often , though it is usually changed by the person deploying it. Customisation:

Version 3.2.3 includes a "packer" that allows users to change themes, colors, and styles to obfuscate the shell's appearance. is a popular and powerful PHP-based web shell

While useful for legitimate remote admin tasks, security vendors like Kali Linux Recorded Future classify it as a malicious backdoor . It is frequently flagged by antivirus software. Vulnerability: It has historically been vulnerable to Cross-Site Request Forgery (CSRF)

, which could allow another attacker to hijack the shell by tricking the logged-in user into clicking a malicious link. Kali Linux

Modern security tools often use deep learning and image classification (converting PHP code into grayscale images) to identify b374k variants that have been obfuscated to bypass traditional text-based scanners. ResearchGate from web shell injections or how to identify signs of compromise b374k | Kali Linux Tools 9 Dec 2025 — Preserve webserver access logs, PHP-FPM / Apache /

The "b374k" shell is one of the many PHP-based shells used for managing or exploiting web servers. Here are some general points about such scripts:

Forensics checklist

Preserve webserver access logs, PHP-FPM / Apache / Nginx logs, and system logs.
Collect file hashes of suspected webshells.
Identify timeline: file creation/modification times and attacker IPs.
Look for lateral movement and credential use elsewhere on the server.
Report incident to stakeholders and, if required, to data protection authorities.

Step 5: The Payload

At this point, the attacker installs cryptocurrency miners, deploys ransomware, or sells SSH access on dark web forums. The b374k.php file acts as a persistent backdoor, surviving OS reinstalls as long as the web application remains.

2. File Identification