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

Overview


This malware sends spammed messages on Facebook that promote a bogus music player feature. The official Facebook music player does not need any installation, as is tied to the page itself and is hooked to a legitimate online music service. Should the URL in the spammed message be clicked, the user's information may be stolen.

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

This malware runs by tricking users into follow instructions from specific URLs.

Once the steps are done by the user, the malicious script posts messages on their contacts' walls or into chat messages.

Clicking the links leads the user to the page showing the instructions mentioned above. Clicking OK leads to a malicious site where the user is tricked into entering personal information.

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

Technical Details


File size: 6,782 bytes
File type: HTML, HTM
Memory resident: No
Initial samples received date: 20 May 2011
Payload: Steals information

Arrival Details

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

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

  • http://{BLOCKED}err.com/player.html
  • http://{BLOCKED}ures.webs.com/profilemusicplayer.htm
  • http://{BLOCKED}okfeatures.webs.com
  • http://{BLOCKED}ures7.webs.com/aboutme.htm
  • http://{BLOCKED}cplayer.webs.com
  • http://{BLOCKED}ilemusic.webs.com

NOTES:

This malware runs by tricking a user to follow instructions from the said URLs.

Once the steps are done by the user, the malicious script posts the following message on their contacts' walls. It also sends a chat message to all contacts using the same format.

The URL can be any of the following:
  • http://{BLOCKED}ures.webs.com/profilemusicplayer.htm
  • http://{BLOCKED}okfeatures.webs.com
  • http://{BLOCKED}ures7.webs.com/aboutme.htm
  • http://{BLOCKED}cplayer.webs.com
  • http://{BLOCKED}ilemusic.webs.com

Clicking any of these leads the user to the page showing the instructions mentioned above.

It also shows the following message:

Clicking OK leads to the following site where the user is tricked into entering personal information:

If the user inputs the required information, he/she is then be registered to www.{BLOCKED}too.com, an online lottery site.

Solution


Minimum scan engine: 8.900
First VSAPI Pattern File: 8.174.02
First VSAPI Pattern Release Date: 23 May 2011
VSAPI OPR Pattern Version: 8.175.00
VSAPI OPR Pattern Release Date: 23 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.B. 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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Analysis By: Karl Dominguez

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