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JS_CHROMEX.AI

December 05, 2013
 Analysis by: Alvin Bacani
 ALIASES:

Trojan-Clicker.JS.Agent.pk (Kaspersky)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

  TECHNICAL DETAILS

File Size:

997 bytes

File Type:

JS

Memory Resident:

Yes

Initial Samples Received Date:

04 Dec 2013

Payload:

Downloads files

Arrival Details

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

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/5/kmain.js

NOTES:

This Trojan may arrive as part of a Add-on application for Mozilla Firefox, that disguise itself as WhoViewS 5.2.

With this Add-on, everytime Firefox connects to a certain url, the malware also 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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_CHROMEX.AI. 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:

Perform the following Step between Step 2 and Step 3:

Uninstall the Mozilla Firefox add-on WhoViewS 5.2. You may refer to this Mozilla Support page (http://support.mozilla.org/en-US/kb/disable-or-remove-add-ons) on how to remove it.


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