Analysis by: MarfelTi
ALIASES:

Sophos: Mal/Banker-U

 THREAT SUBTYPE:

Information Stealer

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • 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: 181,248 bytes
Memory Resident: Yes
Initial Samples Received Date: 23 Jun 2011

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.

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:

  • https://{BLOCKED}etbanking.caixa.gov.br/SIIBC/index.processa
  • http://www1.{BLOCKED}a.gov.br/imprensa/flash.asp

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:

  • Caixa
  • Internet Banking Caixa

Stolen Information

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

  • http://www.{BLOCKED}x.com.br/fotos/galeria.php

Other Details

This spyware requires the following additional components to properly run:

  • %System%\hookdll.dll - detected as TSPY_BANKER.VTG
  • %System%\hookdll.dll - detected as TSPY_BANKER.VTG

(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 requires the following additional components to properly run:

  • %System%\hookdll.dll - detected as TSPY_BANKER.VTG
  • %System%\hookdll.dll - detected as TSPY_BANKER.VTG

(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.)

  SOLUTION

Minimum Scan Engine: 8.900

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

Remove malware files dropped/downloaded by TSPY_BANKER.CPB

     TSPY_BANKER.VTG

Step 3

Identify and terminate files detected as TSPY_BANKER.CPB

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

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

NOTES:

GENERAL RECOMMENDATION

  1. This malware is detected and removed by the latest Trend Micro anti-malware engine and pattern. Always keep pattern files and engines up-to-date. To know more about updating your Trend Micro product’s pattern, please refer to the following Trend Micro support page:
    http://esupport.trendmicro.com/9/How-do-I-manually-update-the-virus-pattern-of-my-Trend-Micro-Internet.aspx
    Note: The steps apply for specific products indicated in the page.
  2. To actively detect and protect your machine, enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support page to know more about enabling real-time scanning in your Trend Micro product:
    Home Users: http://esupport.trendmicro.com/solution/en-us/1054798.aspx
    Business Users: http://esupport.trendmicro.com/Pages/How-do-I-enable-or-disable-the-Real-time-Protection-of-Trend-M-EN-1038331.aspx
  3. This malware creates and executes services in the affected system to make the malware stay resident in memory. Disable services that are related to this malware.
  4. For shared computers that are connected to a network, ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task.
  5. Enable firewall to protect against threats.
    http://esupport.trendmicro.com/3/How-do-I-enable-or-disable-the-Personal-Firewall-of-Trend-Micr-EN-1038273.aspx
  6. Enforce a strong password policy. Typically, a strong password consists of a mix of numbers, letters, and characters.

SPECIFIC RECOMMENDATION

For malware that steals information
  1. Don’t save login credentials on the local computer.


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