Analysis by: Jayvee Mark Villaroman
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Backdoor may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: 28,907 bytes
File Type: PHP
Memory Resident: No
Initial Samples Received Date: 08 May 2023
Payload: Steals information, Collects system information

Arrival Details

This Backdoor may be hosted on a website and run when a user accesses the said website.

Information Theft

This Backdoor gathers the following data:

  • Operating System
  • Server
  • Server IP
  • User IP
  • Kernel Version
  • Software
  • Storage Space
  • User/Group
  • Time on Server
  • PHP Version
  • Safe Mode Status
  • MySQL Version
  • MSSQL Version
  • PostgreSQL Version
  • Perl Version
  • Python Version
  • Ruby Version
  • WGET Version
  • cURL Version
  • Magic Quotes Version
  • SSH2 Version
  • Oracle Version
  • UID
  • GID
  • Group
  • HDD Free space
  • HDD Used space
  • HDD Total space

Other Details

This Backdoor does the following:

  • Checks for the status of these PHP configurations and set it to 'ON':
    • Safe mode
    • Disable functions
    • Basedir
    • MySQL
    • curl
    • wget
    • perl
    • ruby
    • mssql
    • pgsql
    • python
    • magicquotes
    • ssh2
    • oracle
  • Enumerates available drives in the system and creates a link for a malicious actor to access it
  • This backdoor has a control panel that has the following functions:
    • Info
    • Mass deface
    • Symlink
    • Config
    • Cpanel
    • All_tools
    • Upload files
    • command
    • bikinfile
    • Logout
  • Grants full read, write, and execute privileges to the malicious actor
  • Bypass Symlink protections giving unauthorized access, privilege escalation, data manipulation, code injection, lateral movement, and persistence in the affected system.
  • Bind connect to systems running Perl and C servers using Netsploit which has the following functionalities:
    • Port Binding
    • Connect Back
    • Load and Exploit
  • It shows the following string to indicate that the website has been hacked:
    • Hacked by D7net

It requires being hosted on a web server in order to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.440.03
FIRST VSAPI PATTERN DATE: 12 May 2023
VSAPI OPR PATTERN File: 18.441.00
VSAPI OPR PATTERN Date: 13 May 2023

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Backdoor.PHP.WEBSHELL.SBJSRMUAI. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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