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Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
Encrypted: No
In the wild: Yes


This JavaScript (JS) Trojan uses social engineering methods to lure users into performing certain actions that may, directly or indirectly, cause malicious routines to be performed.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Technical Details

File size: 1,623 bytes
File type: Script
Initial samples received date: 10 Mar 2011
Payload: Connects to URLs/Ips, Displays a pop-up window

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It may be unknowingly downloaded by a user while visiting the following malicious websites:

  • http://{BLOCKED}


This JavaScript (JS) file contains an iframe tag that redirects users to the following Web page:

  • http://{BLOCKED}

The said page displays the following fake YouTube page:

Clicking the supposed video opens a pop-up window that prompts the user to share the video on Facebook:

This script also instructs the user to click the image on the said fake YouTube page. The text is written in Italian, which when translated to English, says:

Unlock VIDEO
REGISTER FOR FREE to a deal below
Win great prizes
Fantastic discounted trips by 70%
Click and play it on facebook!

Clicking the link redirects the user to a legitimate travel website.


Minimum scan engine: 8.900
VSAPI OPR Pattern Version: 7.891.00
VSAPI OPR Pattern Release Date: 11 Mar 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

Scan your computer with your Trend Micro product to delete files detected as JS_FBJACK.A. 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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