Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size: Varies
File Type: HTML, HTM
Initial Samples Received Date: 08 Aug 2011

Arrival Details

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

NOTES:

This is the Trend Micro detection for HTML files with an encrypted JavaScript in a

tag, and its decryptor.

Samples of this malware are seen to exploit the following vulnerabilities:

  • CVE-2010-3552
  • CVE-2010-4452

More information on this vulnerability can be found below:

The behavior of this malware varies across different malware samples.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 8.343.00
VSAPI OPR PATTERN Date: 09 Aug 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_BLACHOW.SM. 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.

Step 4

Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

NOTES:


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