Analysis by: Jaime Benigno Reyes
ALIASES:

Troj/JSRedir-DO (Sophos), JS/TrojanClicker.Agent.NDL trojan (Nod32)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It may be manually installed by a user.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: Varies
File Type: Script
Initial Samples Received Date: 10 Apr 2013

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It may be downloaded from the following remote site(s):

  • http://dl.{BLOCKED}ox.com/u/97125671/kkadobe-ff.xpi

It may be manually installed by a user.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}4free.info/images/section/user/kmain.js

As of this writing, the said sites are inaccessible.

NOTES:
It is a component of a Mozilla Firefox add-on that disguise itself as Adobe Flash Player 3.7. The add-on package kkadobe-ff.xpi is also detected as JS_REDIR.IE. Everytime Mozilla Firefox connects to a site, the malware connects to the mentioned malicious URL.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.848.03
FIRST VSAPI PATTERN DATE: 10 Apr 2013
VSAPI OPR PATTERN File: 9.849.00
VSAPI OPR PATTERN Date: 11 Apr 2013

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

Scan your computer with your Trend Micro product to delete files detected as JS_REDIR.IE. 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.

NOTES:
Uninstall the Mozilla Firefox add-on Adobe Flash Player 3.7. You may refer to this Mozilla Support page on how to remove it.


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