TROJ_DLOADER.ZXY

November 26, 2013
 Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • 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:

3,010,048 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Aug 2009

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.

Other System Modifications

This spyware adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
dwdiag = %System%\dwdiag.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
Windows Update = %Windows%\winupdat.exe

Dropping Routine

This spyware drops the following files:

  • %Windows%\kill.bat

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

Information Theft

This spyware monitors the Internet Explorer (IE) activities of the affected system, specifically the address 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 and/or title bar:

  • bb.com.br
  • 2.rural.com.br
  • BRB Banknet
  • Banco Nossa Caixa
  • Banco Rural
  • Banco Santander (Brasil) S.A.
  • Banco da Amaz
  • Bem-vindo - PayPal
  • Bradesco
  • Bradesco Prime
  • Citibank
  • Credicard Citi Portal
  • HSBC Bank
  • OiVende
  • Portal BANCO REAL
  • Portal Internet Banrisul
  • Safra Net Banking
  • Serasa
  • Unibanco.com - Home
  • bancoamazonia.com.br/netbanking/
  • bancobrasil.com.br
  • banknet.brb.com.br
  • citigold.com.br
  • consulta.credd.com.br
  • hsbc.com.br/ITE/common/html/hsbc-online
  • http://www.bradesco.com.br/html/content/home/index.shtm
  • https://pagseguro.uol.com.br/index.jhtml
  • infobusca.informarketing.com
  • infoseg.gov.br/infoseg/login_form
  • internetbanking.caixa.gov.br/SIIBC/
  • latinamerica.citibank
  • oivende.com.br/oivende/index.jsp
  • ork t - login
  • www.bancoreal.com.br
  • www.banrisul.com.br
  • www.bradescoprime.com.br
  • www.brb.com.br
  • www.cetelem.com.br/wps/portal/cetelem/normal/NL/login
  • www.checkcheck.com.br/consultas
  • www.credicardciti.com.br
  • www.itau.com.br
  • www.itaupersonnalite.com.br
  • www.nossacaixa.com.br
  • www.orkut.com
  • www.paypal.com
  • www.safr net.com.br
  • www.santander.com.br
  • www.serasa.com.br
  • www.sicredi.com.br
  • www.unibanco.com.br
  • www2.infoseg.gov.br/infoseg/
  • www2.infoseg.gov.br/sinivem

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 Nossa Caixa
  • Banco Real
  • Banco Rural
  • Banco Safra
  • Banco Santander
  • Banco da Amaz
  • Banco da Amazônia
  • Banco de Brasília
  • Banco do Brasil
  • Banrisul
  • Bradesco
  • Caixa
  • Cetelem
  • Check Check
  • Citibank
  • Citigold
  • Consulta de Crédito
  • Credicard
  • HSBC
  • HSBC Bank
  • INFOSEG
  • InfoBusca
  • OiVende
  • Orkut
  • PagSeguro
  • PayPal
  • Safra Net
  • Serasa
  • Sicredi
  • Unibanco

Drop Points

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

  • {BLOCKED}_70@yahoo.com.br

Variant Information

This spyware has the following MD5 hashes:

  • 35bd9ca88e0b86314050c5bd49485a22

It has the following SHA1 hashes:

  • dfa00152b7742e0d8ca71d58ee0f03ae3583dcdc

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.802.07

FIRST VSAPI PATTERN DATE:

25 Jan 2010

VSAPI OPR PATTERN File:

7.491.00

VSAPI OPR PATTERN Date:

25 Sep 2010

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as TROJ_DLOADER.ZXY

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. 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.
  3. 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • dwdiag=%System%\dwdiag.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
    • Windows Update=%Windows%\winupdat.exe

Step 4

Search and delete this file

[ Learn More ]
There may be some 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%\kill.bat

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.ZXY. 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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