Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 1,742,336 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 03 Oct 2010
Payload: Steals information

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.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Winnet = {malware path and filename}

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 Voc - Mozilla Firefox
  • Banco Santander (Brasil) S.A. - Mozilla Firefox
  • Bradesco - Mozilla Firefox
  • Bradesco Prime - Mozilla Firefox
  • Bradesco Private Bank - Mozilla Firefox
  • Personnalite - Mozilla Firefox
  • Private Bank - Mozilla Firefox
  • Uniclass - Mozilla Firefox
  • http://www.bradesco.com.br/
  • http://www.itau.com.br/
  • http://www.santander.com.br/portal/gsb/script/templates/GCMRequest.do?page=3340

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
  • Bradesco
  • Santander

Stolen Information

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

  • http://www.{BLOCKED}k.sitebr.net/arquivos/tabela.php

Drop Points

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

  • {BLOCKED}ahora2@gmail.com

Variant Information

This Trojan has the following MD5 hashes:

  • 3099887031183a1429702c9d5c5e11c5

It has the following SHA1 hashes:

  • f4ae9a5aeeacc37cd8d06e809c77b0f865406b3f

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.530.02
VSAPI PATTERN Date: 11 Oct 2010
VSAPI PATTERN Date: 10/11/2010 12:00:00 AM

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

Identify and terminate files detected as TROJ_BANKER.LXO

[ 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 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Winnet={malware path and filename}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANKER.LXO. 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.


Did this description help? Tell us how we did.