TROJ_BANKER.LWY

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

It 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. It attempts to steal information, such as user names and passwords, used when logging into certain banking or finance-related websites.

Arrival Details

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

Installation

This Trojan drops the following copies of itself into the affected system:

• %Application Data%\explore.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It drops the following non-malicious files:

• %System%\drivers\banking.sys

(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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
@ = %Application Data%\explore.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\explore

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\banking

Information Theft

This Trojan monitors the Internet Explorer (IE) activities of the affected system, specifically the address bar or title bar. It recreates a legitimate website with a spoofed login page if a user visits banking sites with the following strings in the address bar or title bar:

• Banco Itau - Feito Para Voce
• Banco Santander (Brasil) S.A.
• Banco do Brasil
• Banrisul
• Bradesco
• Brasil
• CEF
• Caixa
• Portal Internet Banrisul
• Santander
• Serasa
• Serasa Experian
• bb.com.br
• http://www.bb.com.br
• http://www.bradesco.com.br
• http://www.bradescocorporate.com.br
• http://www.bradescoempresas.com.br
• http://www.bradescopessoajuridica.com.br
• http://www.bradescoprime.com.br
• http://www.itau.com.br
• http://www.itaupersonnalite.com.br
• http://www.itaupersonnalite.com.br
• http://www.itauprivatebank.com.br
• http://www.santander.com.br
• https://internetbanking.caixa.gov.br
• https://www.caixa.gov.br
• https://www2.bancobrasil.com.br
• https://wwwss.bradesco.com.br

The spoofed login overlaps the legitimate login area of the website, thus tricking the user into thinking that it is part of the IE window. The spoofed login page is located in a fixed area of the legitimate website. The said routine tricks the user into giving out sensitive account-related information. It then logs keystrokes entered by the user in the user name and password fields of the spoofed login page.

It 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.

It attempts to steal information from the following banks and/or other financial institutions:

• Banco Caixa
• Banco Itau
• Banco Santander
• Banco Serasa
• Banco do Brasil
• Banrisul
• Bradesco
• Brasil
• Caixa Economica Federal
• Santander

Stolen Information

This Trojan sends the gathered information via HTTP POST to the following URL:

• http://www.{BLOCKED}b.net/enviador.php
• http://{BLOCKED}eam.com/envia.php

Other Details

This Trojan did not exhibit propagation routines during testing.

It did not exhibit download routines during testing.

It did not exhibit backdoor routines during testing.

Variant Information

This Trojan has the following MD5 hashes:

• b0de5a2bdc3d66ce80f602872735c8dc

It has the following SHA1 hashes:

• 4862b623c620e3c79ffe085fed0051bb9883bab7