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PHP_BACKSHELL.X

October 03, 2014
 Analysis by: Anthony Joe Melgarejo
 PLATFORM:

Windows, Linux, Unix, Mac OSX

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size:

57,365 bytes

File Type:

Script

Memory Resident:

No

Initial Samples Received Date:

02 Oct 2014

Payload:

Compromises system security

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.

NOTES:

Once installed in the compromised web server, remote attackers can access it via the Internet.

Upon access, it displays the following information about the infected machine:

  • Operating system
  • Processor
  • Apache, OpenSSL and PHP version
  • Server IP, Remote user's IP
  • System's current date and time
  • Available drives
  • Current directory

It has the following backdoor capabilities:

  • File Manager or Explorer
  • Display process status
  • Execute code using eval
  • Server information
  • Connect to database
  • Remote shell
  • Reverse shell

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.186.03

FIRST VSAPI PATTERN DATE:

02 Oct 2014

VSAPI OPR PATTERN File:

11.187.00

VSAPI OPR PATTERN Date:

03 Oct 2014

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_BACKSHELL.X. 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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