TROJ_BANKER.BJG

Malware type: Trojan

Aliases: No Alias Found

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

Low

Description: 

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 monitors the Internet Explorer (IE) activities of the affected system. It recreates a legitimate Web site with a spoofed login page if a user visits banking sites with certain strings in the address and title bars.

The spoofed login overlaps the legitimate login area of the Web site, 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 Web site. The said routine 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.

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 then sends the data it gathers to certain email addresses using its SMTP engine.

For additional information about this threat, see:

Description created: Feb. 23, 2009 11:53:13 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 4,852,224 bytes

Details:

Infection Points

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 and Autostart Technique

This Trojan drops the following malicious/non-malicious files:

  • C:\arquivos de programas\plugin\JavaNet.exe - detected by Trend Micro as TROJ_BANCOS.AVD
  • %System%\PLUG.SYS - detected by Trend Micro as TROJ_KILLFILE.EG
  • C:\arquivos de programas\Java.exe - copy of itself
  • %System Root%\Documents and Settings\All Users\Start Menu\Programs\Startup\Java.exe - copy of itself

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Java = C:\Arquivos de programas\Java.exe

Information Theft Routine

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

  • BANRISUL
  • https://internetbanking.caixa.gov.br/siwinstatic/htm/saibaMaisCadMaq/saibaMaisCompleto.htm
  • Conforme portaria 203/1679 do Banco Central

The spoofed login overlaps the legitimate login area of the Web site, 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 Web site. The said routine 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.

Attacked Entities

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

  • todos os usu
  • rios banc
  • Banco Real
  • Portal BANCO REAL
  • http://www.citibank.com.br/
  • https://www.credicarditau.com.br/portals/credicardportal/cadastrese/login.jsp
  • :: Bradesco Pessoa Fisica :: - Mozilla Firefox
  • https://www2.bancobrasil.com.br/aapf/login.jsp?aapf.IDH=sim
  • https://www.credicardciti.com.br/portals/credicardportal/cadastrese/login.jsp
  • https://wwws.nossacaixa.com.br/bemvindo.asp

Stolen Information

This Trojan 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 then saves gathered information in the file Banco BanrisulCaixaBanco CentralRios BancBanco RealCitibankBanco ItauBanco BradescoBanco Brasil.

Drop Points

This Trojan sends the data it gathers to the following email addresses via SMTP using the smtp server, smtp.{BLOCKED}a.com.br:

  • {BLOCKED}o.nervoso@gmail.com
  • {BLOCKED}exy@tutopia.com.br

Variant Information

This Trojan has the following SHA1 hash:

  • a097d367217aeb206a1f2cc829fd9983d8c26adc

It also has the following MD5 hash:

  • 88638ef79fb715b16dfc42f2670bac46

Affected Platforms

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


SOLUTION


Minimum scan engine version needed: 8.700

Pattern file needed: 5.451.00

Pattern release date: Aug 1, 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 Malware Files

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

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 Malware Process

This procedure terminates the running malware 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 malware 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 malware files in the list of running processes.
  5. To check if the malware 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 malware 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 malware 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/modifies registry keys/entries added/modified by this malware. 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:

    Java = C:\Arquivos de programas\Java.exe

  4. Close Registry Editor.

Deleting the Malware File(s)

  1. Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
  2. In the Named input box, type:
    C:\arquivos de programas\plugin\JavaNet.exe
  3. In the Look In drop-down list, select My Computer, then press Enter.
  4. Once located, select the file then press SHIFT%20DELETE.
  5. Repeat steps 2-4 to delete the following files:
    C:\arquivos de programas\Java.exe
    %System Root%\Documents and Settings\All Users\Start Menu\Programs\Startup\Java.exe

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 TROJ_BANKER.BJG. 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.




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