TSPY_BANKER.DX

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TypeSpyware

In the wild: No

Destructive: No

Language: English

Systems affected: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Low

Reported detections:

Low

System  impact:

High

Information exposure:

High
 

Description:

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

TSPY_BANKER.DX Behavior Diagram

Spyware Overview

This spyware arrives on a system as a file dropped by other spyware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops a copy of itself in the Windows system folder. It also modifies the registry so that it automatically runs at every system startup.

This spyware monitors the Internet Explorer activities of the affected system, specifically the address and title bars. It recreates a legitimate Web site with a spoofed login page if a user visits certain banking sites.

This tricks the user into giving out sensitive account-related information. It logs keystrokes entered by the user in the user name and password fields of the spoofed login page. This may then lead to the unauthorized use of the stolen data.

It sends gathered information via email using a specified Simple Mail Transfer Protocol (SMTP) server. It sends all the gathered information to specified email addresses.



TECHNICAL DETAILS



Initial samples received on:  Sep 14, 2008

File type: PE

Memory resident: Yes  

File size: 1,837,056 Bytes

Details:

Infection Points

This spyware arrives on a system as a file dropped by other spyware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation and Autostart Technique

This spyware drops a copy of itself as %System%\vmmreg32.exe.

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It creates the following registry entry to enable its automatic execution at system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
hotdlll = "%System%\vmmreg32.exe"

Information Theft Routine

This spyware monitors the Internet Explorer activities of the affected system, specifically the address and title bars. It recreates a legitimate Web site with a spoofed login page if a user visits banking sites with the following strings:

In the title bar:

  • Banco Bradesco S/A
  • Banco Ita
  • BancoDoBrasil
  • Banking Caixa
  • Bem-vindo ao Citibank Brasil - Inicio
  • HSBC Bank Brasil S.A.- No Brasil e no mundo, HSBC.Internet Explorer
  • Portal Internet Banrisul
  • Santander Banespa

In the address bar:

  • http://www.banrisul.com.br/
  • http://www.caixa.com.br/
  • https://www.latinamerica.citibank.com/BRGCB/JPS/portal/Index.do
  • https://www2.bancobrasil.com.br/aapf/login.jsp?aapf.IDH=sim
  • https://wwws.nossacaixa.com.br/bemvindo.asp

The spoofed login overlaps the legitimate login area of the Web site, thus tricking the user into thinking that it is part of the Internet Explorer window. The spoofed login page is located in a fixed area of the legitimate Web site.

This tricks the user into giving out sensitive account-related information. It logs keystrokes entered by the user in the user name and password fields of the spoofed login page.

Propagation Routine

During testing, this spyware did not exhibit propagation routines.

Attacked Entities

This spyware attempts to retrieve information from the following list of banks/financial institutions:

  • Banco Bradesco
  • Banco Ita
  • BancoDoBrasil
  • Banrisul
  • Caixa
  • Citibank
  • HSBC
  • Santander

Stolen Information

This spyware attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.

Drop Points

This spyware sends gathered information via email using the Simple Mail Transfer Protocol (SMTP) server {BLOCKED}5.google.com. It sends all the gathered information to the following email addresses:

  • {BLOCKED}s.unk2@gmail.com
  • {BLOCKED}linho@gmail.com

Download Routine

During testing, this spyware did not exhibit download routines.

Backdoor Channel

During testing, this spyware did not exhibit backdoor routines.

Variant Information

This spyware has the following SHA1 hash:

  • 05d59c2987132acc1c1c6eb212770d77084d77f1

It has the following MD5 hash:

  • b968343f270cec2b8b26a076a6733fc3

Affected Platforms

This spyware runs on Windows 98, ME, NT, 2000, XP, and Server 2003.


Analysis by:  David Escubio



SOLUTION


Minimum scan engine version needed: 8.500

Download the latest scan engine

Virus pattern version needed : 5.541.00

Pattern release date:  Sep 14, 2008


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Spyware Files

  1. Scan your computer with your Trend Micro antivirus product.
  2. Note the path and file name of all files detected as TSPY_BANKER.DX.

Trend Micro customers need to download the latest virus pattern file before scanning their computer. Other users can use Housecall, the Trend Micro online threat scanner.

Terminating the Spyware Process

This procedure terminates the running spyware process. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager.
    • On Windows 98 and ME, press
    CTRL%20ALT%20DELETE
    • On Windows NT, 2000, XP, and Server 2003, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the spyware file(s) detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
  4. Do the same for all detected spyware files in the list of running processes.
  5. To check if the spyware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On computers running Windows 98 and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the spyware process.

If the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure. If the spyware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Removing Autostart Entries from the Registry

This solution deletes a registry entry added by this spyware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    hotdlll = �%System%\vmmreg32.exe�
    (Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
  4. Close Registry Editor.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as TSPY_BANKER.DX. To do this, Trend Micro customers must download the latest virus pattern file and scan their computers. Other Internet users can use HouseCall, the Trend Micro online threat scanner.