Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This spyware 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.

  TECHNICAL DETAILS

File Size: 1,678,336 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 23 Sep 2010

Arrival Details

This spyware 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 spyware 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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
(default) = %Application Data%\explore.exe

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\explore

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = 0

Dropping Routine

This spyware drops the following files:

  • %Windows%\Bank
  • %System%\drivers\banking.sys

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.)

Information Theft

This spyware 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 Ita - Feito Para Voc - Mozilla Firefox
  • Banco Santander (Brasil) S.A. - Mozilla Firefox
  • Banco do Brasil
  • Banrisul - Internet Explorer
  • Bradesco - Mozilla Firefox
  • Portal Internet Banrisul - Mozilla Firefox
  • Serasa Experian - Consulta Serasa, Cheque, CPF, CNPJ, Credito e Certificado Digital - Mozilla Firefox
  • [bb.com.br] - Mozilla Firefox
  • http://www.bb.com.br/portalbb/home23
  • http://www.itau.com.br/
  • http://www.itau.com.br/index.htm
  • http://www.itau.com.br/itaucred/
  • http://www.itau.com.br/itaushopline/
  • http://www.itau.com.br/seguros/
  • http://www.itaupersonnalite.com.br/index.jsp
  • http://www.it uprivatebank.com.br/privatebank/default.aspx
  • https://internetbanking.caixa.gov.br/SIIBC/index.processa
  • https://internetbanking.caixa.gov.br/SIIBC/siwinCtrl
  • https://www.caixa.gov.br/_newredirect/barra/r_IBC.asp
  • https://www2.bancobrasil.com.br/aapf/login.jsp?aapf.IDH=sim&perfil=1

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 Itau
  • Banco Santander
  • Banco do Brasil
  • Banrisul
  • Bradesco
  • Caixa
  • Serasa Experian

Stolen Information

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

  • http://www.{BLOCKED}kvendas123.com.br/images/infect.php
  • http://www.{BLOCKEDkvendas123.com.br/images/info.php

Drop Points

This spyware sends the information it gathers to the following email addresses:

  • pilotodefugaloko@gmail.com
  • pilotodefugaloko@gmail.com

Variant Information

This spyware has the following MD5 hashes:

  • 8fb4176c43de81af5e3a83bd77eb858c

It has the following SHA1 hashes:

  • 36e74d420f9c45d5cce3b11ce20b46bb8ecc70c5

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: currently processing

Step 1

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.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • (default)=%Application Data%\explore.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • EnableLUA=0

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER
    • explore

Step 5

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.  %Windows%\Bank
%System%\drivers\banking.sys

Step 6

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