Analysis by: Anthony Joe Melgarejo
ALIASES:

Mal/JSRedir-J (Sophos), PUA.HTML.Infected.WebPage (ClamAV), Trojan-Clicker.HTML.IFrame.gen (VBA32)

 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: Spammed via email

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be hosted on a website and run when a user accesses the said website.

This is the Trend Micro detection for files that contain a malicious script. It inserts an IFRAME tag that redirects users to certain URLs.

  TECHNICAL DETAILS

File Size: 6,729 bytes
File Type: HTML, HTM
Initial Samples Received Date: 08 Feb 2013
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}k.{BLOCKED}ps.net/WebTracking/track.html

It saves the files it downloads using the following names:

  • %User Temp%\tmp{random numbers}\Psupdate.exe - detected as TSPY_ZBOT.MTF

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This is the Trend Micro detection for files that contain a malicious script.

It inserts an IFRAME tag that redirects users to the following URLs:

  • http://{BLOCKED}k.{BLOCKED}ps.net/WebTracking/track.html

NOTES:

It contains links which, when clicked, will make the browser visit the following sites:

  • http://{BLOCKED}k.{BLOCKED}ps.net/WebTracking/
  • http://{BLOCKED}k.{BLOCKED}ps.net/WebTracking/invoiceGI9OC55B6CKMNB6PJT.JPG.exe

The second link mentioned above will download the following file when visited:

  • {user-defined download directory}\invoiceGI9OC55B6CKMNB6PJT.JPG.exe - also detected as TSPY_ZBOT.MTF

This malicious webpage poses as a United Parcel Service (UPS) delivery information to lure users in downloading other malware.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.714.03
FIRST VSAPI PATTERN DATE: 08 Feb 2013
VSAPI OPR PATTERN File: 9.715.00
VSAPI OPR PATTERN Date: 08 Feb 2013

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 malware/grayware files dropped/downloaded by JS_REDIR.MTF

    • TSPY_ZBOT.MTF

Step 3

Close all opened browser windows

Step 4

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