PHP_WEBSHELL.F

February 04, 2016

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 Analysis by: Pearl Charlaine Espejo

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 ALIASES:

Backdoor.PHP.PhpShell.dc (Kaspersky); Backdoor:PHP/WebShell.A (Microsoft); Troj/PhpShel-M (Sophos); Backdoor.PHP.WebShell.~AA (Comodo)

 PLATFORM:

Windows, Linux

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

  TECHNICAL DETAILS

File Size:

24,758 bytes

Memory Resident:

No

Initial Samples Received Date:

26 Jan 2016

Arrival Details

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

This malware arrives via the following means:

• May be uploaded and installed on a web server by a remote malicious user after gaining access to the server.

NOTES:

Once this PHP script is installed, the user may then launch a backdoor on the affected system. Opening the page, the malicious user is shown a user interface for its malicious routines.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.314.04

FIRST VSAPI PATTERN DATE:

03 Feb 2016

VSAPI OPR PATTERN File:

12.315.00

VSAPI OPR PATTERN Date:

04 Feb 2016

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_WEBSHELL.F. 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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