logo.png
Guided Website Threat Review

Foregenix Blog

Benjamin Hosack

Alert: New PHP Webshell Identified

web security, Magento

,03/03/17 11:50

A new piece of malware has been identified by the Foregenix DFIR team.  The malware is a PHP webshell - a script, which when installed on a compromised system, presents a sophisticated administration platform allowing the attacker to browse the filesystem of the compromised server, upload, create, edit, download or delete files or stop running processes.

The Malware

It even has functionality to add a further backdoor onto the system which would allow the attacker to connect back to the server as desired. The malware, named ‘BArNEr’ within the code, appears to be present on a number of systems in the wild and may be connected to an Indonesian cyber crime collective called the ‘Indonesia HackRs’. 

New PHP Malware.png

The code that creates the web shell is generally found “hidden” at the end of a JPEG image.

Known as a ‘dropper’, this file would first be placed on a compromised system and then activated by the attacker requesting it from the website. During analysis it was found that the code for the web shell did not work on PHP 7 (due to its use of a depreciated function) but would function as intended if the affected website was running PHP5.

Foregenix urges website owners to examine their systems for presence of this malware. 

How do I detect this malware on my website?

Guided Website Threat ReviewDetection is simple with the right tools.  Apply for a Guided Threat Review of your website and our team will scan the internal file system of your website using FGX-Web for this malware and many others.

Alternatively, the following grep commands should reveal these files if they are present:

Ajax Harvester  Initialiser

grep -slr‘\\x6F\\x6E\\x65\\x70\\x61\\x67\\x65\\x7C\\x63\\x68\\

x65\\x63\\x6B\\x6F\\x75\\x74\\x7C\\x6F\\x6E\\x65\\x73\\x74\\x65\\

x70\\x7C\\x66\\x69\\x72\\x65\\x63\\x68\\x65\\x63\\x6B\\x6F\\x75\\x74’ .

 

Ajax Harvester – Harvester

grep –slr‘\\x73\\x65\\x6C\\x65\\x63\\x74\\x5B\\x69\\x64\\x3D\\x22\\x73\\

x74\\x72\\x69\\x70\\x65\\x43\\x61\\x72\\x64\\x45\\x78\\x70\\x69\\x72\\

x79\\x59\\x65\\x61\\x72\\x22\\x5D’ .

 

Webshell Dropper

grep -slrR 'file_exists\|BADUBAMM' .

 

BArNEr’ Webshell

grep -slr '7P15f9s4kjgO/737+ex7YDSejj12rNOH4o6nqfs+rTOdn4ciKYoSJcqk7t' .

TRENDING POSTS

Kirsty Trainer
The "Key" to Secure Data - P2PE - Derived Unique Key Per Transaction (DUKPT)

Written by Andrew McKenna, PCI QSA, PCIP at Foregenix The encryption key infrastructure usually ...

Read More
Duncan Slater
Alert: Major UK Payment Service Provider iFrame Man-In-The-Middle Breach

The Foregenix Digital Forensics and Incident Response Team recently reported a man-in-the-middle ...

Read More

Cyber Security Insights

Ewan Gardner
07/08/17 14:51

Anatomy Of A Magento Attack: Froghopper

  Magento is the most popular eCommerce web application in the world, with an estimated 236,000 live web sites using the Content Management System ...

Read More

Richard Jones
03/08/17 10:54

Premier League Club Shows Commitment To GDPR

We're happy to annound that Premier League football club West Ham United has partnered Foregenix to prepare for the upcoming GDPR’s new data privacy ...

Read More

Mike Hinton
02/08/17 11:09

Foregenix Partner with Magento Solutions Partner, PushON

  We’re extremely happy to announce our newly formed partnership with Manchester based agency PushON. Over the past few months both parties have ...

Read More

Zacharias Pigadas
27/07/17 10:09

How Your Cyber Security Efforts Can Turn Into Security Nightmares

A short (and fairly common) story of how quick and dirty initiatives to deal with security weaknesses can actually land you an ordeal of problems and ...

Read More

Duncan Slater
21/07/17 10:15

Foregenix Review of the Office for National Statistics Crime Survey

Today [July 20th 2017] the Office for National Statistics in the UK released their annual Crime Survey for England and Wales (CSEW), for the twelve ...

Read More