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Threat Encyclopedia

JS_FBJACK.C

ANALYSIS BY

Roland Marco Dela Paz


PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Propagates via social networking sites


This malware spreads via the Facebook chat feature. It entices users to click a link by saying that it leads to an execution video of Osama bin Laden.

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

This malicious JavaScript sends an instant message to an affected user's online friends. It also posts a message on the affected user's Facebook Wall. It entices users to click the link contained in posted messages by using the news of Osama bin Laden's death.

TECHNICAL DETAILS

File Size:

10,717 bytes

File Type:

JS

Initial Samples Received Date:

03 May 2011

Payload:

Displays message/message boxes

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://{BLOCKED}0.85.172/bl.js

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ount.info/end.php

NOTES:
This malicious JavaScript is part of a Facebook spam campaign that spreads via the said website's chat feature. The said spam campaign uses the news of Osama bin Laden's death. It sends the following chat message to affected user's online friends:

  • "See the Osama Bin Laden EXECUTION Video! http://{BLOCKED}p.com/805u7p? "
Posts the following message onto the affected user's status update:

This will leave you speechless
Osama Bin Laden EXECUTION Video!
http://{BLOCKED}ly.ws/e4lqeg?
Navy Seals raid Bin Ladens hideout and execute him!
http://{BLOCKED}dssz.co.cc/laden.png

It registers the user to be a fan of the MW GIVEAWAY MW GIft page. It also hides chat boxes from the user's window. The following sites are shortened URLs that also point to http://{BLOCKED}count.info/end.php:
  • http://{BLOCKED}p.com/805u7p?
  • http://{BLOCKED}ly.ws/e4lqeg
As of this writing, the following sites are inaccessible:
  • http://{BLOCKED}ount.info/end.php
  • http://{BLOCKED}dssz.co.cc/laden.png

SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

8.135.00

VSAPI OPR PATTERN Date:

03 May 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

Close all opened browser windows

Step 3

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