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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This is the Trend Micro detection for HTML files with encrypted HTML codes that contains a link to a certain file.

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: 22 May 2012
Payload: Downloads files

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 encrypted HTML codes that contains a link to the file ../../ar405eng.exe. The encrypted HTML codes are decrypted by a JavaScript.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.130.05
FIRST VSAPI PATTERN DATE: 22 May 2012
VSAPI OPR PATTERN File: 9.131.00
VSAPI OPR PATTERN Date: 23 May 2012

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_OBFUS.MCH. 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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