Analysis by: Christopher Daniel So
ALIASES:

Trojan:JS/Redirector.DZ (Microsoft), SecurityRisk.URLRedir (Symantec), Trojan.JS.Redirector.kc (Kaspersky), JS/Redirector.AI (AntiVir)

 PLATFORM:

Windows 2000, XP, 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 redirects browsers to certain sites. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 4,996 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 20 Feb 2010

Arrival Details

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

Other Details

This Trojan redirects browsers to the following sites:

  • http://{BLOCKED}yp1.co.kr/index3.html

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.503.00
VSAPI OPR PATTERN Date: 28 Sep 2010

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_REDIRECTOR.CH. 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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