Analysis by: RonJay Kristoffer Caragay
ALIASES:

Troj/PhpShel-G (Sophos); PHP/PhpShell.CS!tr (Fortinet); Backdoor.PHP.WebShell (Ikarus); Backdoor.PHP.AVW (F-Secure); Backdoor.PHP.Agent.up (Kaspersky); Backdoor.PHP.WebShell.a (v) (VIPRE); PHP/Shell.AM (PHP/Shell.AM)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

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

  TECHNICAL DETAILS

File Size: 23,279 bytes
File Type: Script
Initial Samples Received Date: 02 Aug 2015

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.

NOTES:

This backdoor is a web panel that is capable of manipulating commands to be executed on affected machines.

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.826.08
FIRST VSAPI PATTERN DATE: 02 Aug 2015
VSAPI OPR PATTERN File: 11.827.00
VSAPI OPR PATTERN Date: 02 Aug 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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as PHP_WEBSHELL.CP. 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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