Analysis by: Michael Cabel
 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: Varies
File Type: Script
Memory Resident: No
Initial Samples Received Date: 23 Jan 2013
Payload: Connects to URLs/IPs

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

NOTES:

This JavaScript connects to the following URLs:

  • //{BLOCKED}su.com/js/cek.js
  • //{BLOCKED}neclose.com/js/cek.js
  • //{BLOCKED}neson.com/js/cek.js
  • //{BLOCKED}nesil.com/js/cek.js
  • //{BLOCKED}unelikaldir.com/js/cek.js

It then redirects to the following URLs to tag the affected users' friends in Facebook and posts a message with a malicious link:

  • http://www.{BLOCKED}su.com/users/ana.php
  • http://www.{BLOCKED}su.com/users/wallpost.php
  • http://www.{BLOCKED}su.com/users/grup.php

The posted link can be any of the following:

  • http://{BLOCKED}izlihile.tk
  • http://{BLOCKED}rdarbe.tkl

  SOLUTION

Minimum Scan Engine: 9.300

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

Remove the malware/grayware file that dropped/downloaded JS_FEZTAG.A

    HTML_FEZTAG.A

Step 3

Close all opened browser windows

Step 4

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