Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan executes when a user accesses certain websites where it is hosted. It may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: Varies
File Type: Script
Initial Samples Received Date: 07 Jan 2011
Payload: Downloads files

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

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

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

  • Vulnerability in MicrosoftInternet Explorer 7 and 8 (CVE-2010-3971)

After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:

  • http://{BLOCKED}oodb4u.com/sessions/22564.php
  • http://hz.{BLOCKED}yv.cn/in.cgi
  • http://{BLOCKED}counter.com/user/174/in.php

Other Details

More information on this vulnerability can be found below:

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.753.00
VSAPI OPR PATTERN Date: 08 Jan 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_SHELLCODE.SMA. 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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