B374k.php Repack May 2026

Security Analysis Report: b374k.php Web Shell 1. Executive Summary is a well-known, high-risk malicious script classified as a

in web server logs (Apache/Nginx) suggests the shell is active and being used. Unusual Directory Access: b374k.php

• Delete it immediately
• Scan for other backdoors
• Review server logs for unauthorized access
• Rotate all credentials

Behavior Analysis

b374k allows file uploads. Monitor your /tmp directory. If you see PHP scripts writing to /tmp/sess_* or executing system() functions where they shouldn't, investigate. Security Analysis Report: b374k

Analysis of Backdoor Shells in Web Servers Using Splunk and SPL-Based Machine Learning: This 2026 paper uses b374k.php as a primary example of a popular backdoor shell used to identify anomalies in web server logs. Delete it immediately Scan for other backdoors Review