Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This malicious browser extension is disguised as a Facebook Valentines Theme that affects browsers, one of which is the Google Chrome browser.

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. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size: 41,519 bytes
File Type: Other
Initial Samples Received Date: 27 Jan 2012
Payload: Connects to URLs/IPs

Arrival Details

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

It may be manually installed by a user.

NOTES:

This is Trend Micro's detection for a browser extension which is disguised as a Facebook Valentines Theme that affects Google Chrome browser. Before continuing the installation, Chrome warns the user about the application's access rights.

Upon installation, this application executes a script in the following URL:

  • http://{BLOCKED}rs.{BLOCKED}kakkar.com/script.php
This script is capable of displaying ads from:
  • http://{BLOCKED}rs.{BLOCKED}kakkar.com/ad.php
  • http://{BLOCKED}rs.{BLOCKED}kakkar.com/ad2.php
When the user logs in to his facebook account, the script displays the message 'Please wait...processing your request' as well as this image:

After 9 seconds it redirects to:

  • http://{BLOCKED}rs.{BLOCKED}kakkar.com/video.php?new
The aforementioned page asks for the user to provide 'human verification':

Finally, when the user is logged in to his account, the script automatically 'likes' several pages including:

It may also post a message on friends' Facebook walls:

The message, when clicked redirects to this page when clicked:

  • http://{BLOCKED}n2test2.{BLOCKED}r.com/?user={user ID}

Clicking the image installs the malicious Chrome extension.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.738.07
FIRST VSAPI PATTERN DATE: 27 Jan 2012
VSAPI OPR PATTERN File: 8.739.00
VSAPI OPR PATTERN Date: 28 Jan 2012

Step 1

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

Step 2

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.

NOTES:

MANUAL CLEANUP SOLUTION

To manually remove this chrome extension, please follow the steps below:

  1. Open Google Chrome browser.
  2. Click the "Customize and Control Google Chrome" button at the top right portion of the browser.
  3. Go to Tools > Extensions.
  4. Find "Facebook Improvement ! Facebook.com" and click "Uninstall".


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