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PHP_ARHYSHEL.CQJ

September 17, 2015
 Analysis by: Francis Xavier Antazo
 ALIASES:

Backdoor:PHP/SimpleShell.A (Microsoft)

 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.

It executes commands from a remote malicious user, effectively compromising the affected system.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

4023 bytes

File Type:

GIF

Memory Resident:

Yes

Initial Samples Received Date:

14 Jul 2015

Payload:

Steals information

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • download component file
  • execute downloaded component file
  • download arbitrary file
  • execute arbitrary command
  • get local php configuration file
  • get local list of files

Information Theft

This backdoor accepts the following parameters:

  • URL to send and receive information
  • directory for downloaded file

It retrieves the following information from the affected system:

  • user id
  • group id
  • current user
  • OS Version

Stolen Information

This backdoor sends the data it gathers to the following email addresses via SMTP:

  • {BLOCKED}ex8@gmail.com

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.924.03

FIRST VSAPI PATTERN DATE:

17 Sep 2015

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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 PHP_ARHYSHEL.CQJ. 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 this Knowledge Base page for more information.


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