: Investigate your server logs to see how the file was uploaded. Common entry points include compromised FTP accounts or vulnerabilities in CMS plugins (like WordPress or Joomla).

: These archives typically contain PHP or ASP files that, once uploaded and extracted on a server, allow a user to remotely execute commands, manage files, and access databases via a web browser.

nst-admin.php : The main entry point for the administrative interface. Support libraries for database manipulation (SQL dumping).

: In many cases, files named nst-admin.zip (or similar variations like "NST Shell") are utilized by attackers who have gained unauthorized access to a site. They use the script to maintain "persistence"—ensuring they can get back into the server even if the original vulnerability is patched. Common Contents :

: Use a server-side malware scanner (like Maldet or ClamAV) to identify the specific signatures within the ZIP.