B374k.php -

The string "b374k.php" refers to a well-known PHP webshell (also called b374k shell). It is a script used for server administration — but more commonly associated with malicious activity (backdoors, file managers, remote execution).

If you are asking for features of b374k.php (the webshell), here is a comprehensive list: b374k.php

1. Identification

Web shells often contain heavily obfuscated code (e.g., long strings of base64 encoded data) to hide their logic from scanners. A typical characteristic includes calls to eval(), base64_decode(), or gzinflate() combined with complex string manipulation. The string "b374k

Detection indicators

• Unusual files with recent modification times in web root.
• Files containing eval(base64_decode(...)) or gzuncompress/gzinflate patterns.
• Unexpected PHP code blocks in otherwise static files.
• Spikes in outgoing network connections or unexpected processes.
• Alerts from malware scanners, WAF, or host-based IDS.

Part 5: Forensic Analysis – I’ve Found b374k.php. Now What?

If your antivirus or file integrity monitor flags b374k.php on your server, do not panic. But do not simply delete it. Follow this forensic process. Unusual files with recent modification times in web root

5. Implement Web Shell-Specific Protections

• Disable dangerous PHP functions in php.ini: disable_functions = exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source
• Enable open_basedir to restrict file access to the web root.
• Set allow_url_fopen = Off and allow_url_include = Off.

Step 3: Privilege Escalation & Persistence

Once inside b374k, the attacker clicks "Command" and runs:

• whoami (to see the web server user, usually www-data or apache)
• ls -la /home (to find other user directories)
• grep -r "DB_PASSWORD" /var/www/ (to harvest database creds)