TROJ_DLOADER.ZXY
Windows 2000, XP, Server 2003
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
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
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
- 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.
- 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.
- 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
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
- dwdiag=%System%\dwdiag.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
- Windows Update=%Windows%\winupdat.exe
- Windows Update=%Windows%\winupdat.exe
Step 4
Search and delete this file
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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