TROJ_BANKER.IOR

October 08, 2012
 Analysis by: jasperm
 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 may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It connects to certain websites to send and receive information. It redirects browsers to certain sites.

  TECHNICAL DETAILS

File Size:

1,402,884 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

04 Oct 2010

Payload:

Drops files, Modifies HOSTS file

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan adds the following folders:

  • %Windows%\diabolick

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

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Ati2vexx = %Windows%\diabolick\rndll.exe

It drops the following files:

  • %Windows%\diabolick\rndll.exe - copy of itself
  • %Windows%\diabolick\update.txt - non malicious
  • %Windows%\diabolick\hosts.txt - contains the downloaded hosts file
  • %Windows%\diabolick\tempo.txt - non malicious file

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

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}p.datahouse.com.br
  • http://{BLOCKED}rmolowich.com/images/hosts.txt
  • http://{BLOCKED}rmolowich.com/images/timer.txt

HOSTS File Modification

This Trojan modifies the system's HOSTS files to redirect users once the following Web site(s) are accessed:

  • www.bancopaulista.com.br
  • bancopaulista.com.br
  • www.citibank.com.br
  • citibank.com.br
  • www.citibank.com
  • citibank.com
  • www.bradesco.com.br
  • bradesco.com.br
  • bradesco.com.br
  • www.bb.com.br
  • bb.com.br
  • www.bancobrasil.com.br
  • bancobrasil.com.br
  • www.bancodobrasil.com.br
  • bancodobrasil.com.br
  • www.itau.com.br
  • itau.com.br
  • www.bancoitau.com.br
  • bancoitau.com.br
  • www.itaupersonnalite.com.br
  • itaupersonnalite.com.br
  • internetbanking.caixa.gov.br
  • www.unibanco.com.br
  • unibanco.com.br
  • www.unibanco.com
  • unibanco.com
  • www.caixa.com.br
  • www.caixa.gov.br
  • www.caixaeconomica.com.br
  • www.caixaeconomica.gov.br
  • www.caixaeconomicafederal.com.br
  • www.caixaeconomicafederal.gov.br
  • www.cef.com.br
  • www.cef.gov.br
  • caixa.com.br
  • caixa.gov.br
  • caixaeconomica.com.br
  • caixaeconomica.gov.br
  • caixaeconomicafederal.com.br
  • caixaeconomicafederal.gov.br
  • cef.com.br
  • cef.gov.br
  • www.bancoreal.com.br
  • bancoreal.com.br
  • www.santander.com.br
  • santander.com.br
  • www.santandernet.com.br
  • santandernet.com.br
  • www.banrisul.com.br
  • banrisul.com.br
  • www2.americanexpress.com.br
  • www.americanexpress.com.br
  • americanexpress.com.br
  • www.americanexpress.com
  • americanexpress.com
  • www.submarino.com.br
  • submarino.com.br
  • www.netcerto.com.br
  • netcerto.com.br
  • www.americanas.com.br
  • americanas.com.br
  • www.comprafacil.com.br
  • comprafacil.com.br
  • www.shoptime.com.br
  • shoptime.com.br
  • www.cielo.com.br
  • www.visanet.com.br
  • visanet.com.br
  • cielo.com.br
  • www.bvfinanceira.com.br
  • bvfinanceira.com.br

It adds the following strings to the Windows HOSTS file:

  • {BLOCKED}.{BLOCKED}.213.91 www.bancopaulista.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bancopaulista.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.citibank.com.br
  • {BLOCKED}.{BLOCKED}.213.91 citibank.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.citibank.com
  • {BLOCKED}.{BLOCKED}.213.91 citibank.com
  • {BLOCKED}.{BLOCKED}.213.91 www.bradesco.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bradesco.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bradesco.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.bb.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bb.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.bancobrasil.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bancobrasil.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.bancodobrasil.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bancodobrasil.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.itau.com.br
  • {BLOCKED}.{BLOCKED}.213.91 itau.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.bancoitau.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bancoitau.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.itaupersonnalite.com.br
  • {BLOCKED}.{BLOCKED}.213.91 itaupersonnalite.com.br
  • {BLOCKED}.{BLOCKED}.213.91 internetbanking.caixa.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 www.unibanco.com.br
  • {BLOCKED}.{BLOCKED}.213.91 unibanco.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.unibanco.com
  • {BLOCKED}.{BLOCKED}.213.91 unibanco.com
  • {BLOCKED}.{BLOCKED}.213.91 www.caixa.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.caixa.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomica.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomica.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomicafederal.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomicafederal.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 www.cef.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.cef.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 caixa.com.br
  • {BLOCKED}.{BLOCKED}.213.91 caixa.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 caixaeconomica.com.br
  • {BLOCKED}.{BLOCKED}.213.91 caixaeconomica.gov.br
  • {BLOCKED}.{BLOCKED}.213.91caixaeconomicafederal.com.br
  • {BLOCKED}.{BLOCKED}.213.91 caixaeconomicafederal.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 cef.com.br
  • {BLOCKED}.{BLOCKED}.213.91 cef.gov.br
  • {BLOCKED}.{BLOCKED}.213.91 www.bancoreal.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bancoreal.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.santander.com.br
  • {BLOCKED}.{BLOCKED}.213.91 santander.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.santandernet.com.br
  • {BLOCKED}.{BLOCKED}.213.91 santandernet.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.banrisul.com.br
  • {BLOCKED}.{BLOCKED}.213.91 banrisul.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www2.americanexpress.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.americanexpress.com.br
  • {BLOCKED}.{BLOCKED}.213.91 americanexpress.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.americanexpress.com
  • {BLOCKED}.{BLOCKED}.213.91 americanexpress.com
  • {BLOCKED}.{BLOCKED}.213.91 www.submarino.com.br
  • {BLOCKED}.{BLOCKED}.213.91 submarino.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.netcerto.com.br
  • {BLOCKED}.{BLOCKED}.213.91 netcerto.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.americanas.com.br
  • {BLOCKED}.{BLOCKED}.213.91 americanas.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.comprafacil.com.br
  • {BLOCKED}.{BLOCKED}.213.91 comprafacil.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.shoptime.com.br
  • {BLOCKED}.{BLOCKED}.213.91 shoptime.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.cielo.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.visanet.com.br
  • {BLOCKED}.{BLOCKED}.213.91 visanet.com.br
  • {BLOCKED}.{BLOCKED}.213.91 cielo.com.br
  • {BLOCKED}.{BLOCKED}.213.91 www.bvfinanceira.com.br
  • {BLOCKED}.{BLOCKED}.213.91 bvfinanceira.com.br

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}p.datahouse.com.br
  • http://{BLOCKED}rmolowich.com/images/hosts.txt - contains strings for hosts file modification
  • http://{BLOCKED}molowich.com/images/timer.txt

It redirects browsers to the following sites:

  • {BLOCKED}.{BLOCKED}.213.91

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.512.17

VSAPI PATTERN Date:

04 Oct 2010

VSAPI PATTERN Date:

10/4/2010 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.IOR

[ 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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • Ati2vexx=%Windows%\diabolick\rndll.exe

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Windows%\diabolick

Step 5

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    • {BLOCKED}.{BLOCKED}.213.91 americanas.com.br
    • {BLOCKED}.{BLOCKED}.213.91 americanexpress.com
    • {BLOCKED}.{BLOCKED}.213.91 americanexpress.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bancobrasil.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bancodobrasil.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bancoitau.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bancopaulista.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bancoreal.com.br
    • {BLOCKED}.{BLOCKED}.213.91 banrisul.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bb.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bradesco.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bradesco.com.br
    • {BLOCKED}.{BLOCKED}.213.91 bvfinanceira.com.br
    • {BLOCKED}.{BLOCKED}.213.91 caixa.com.br
    • {BLOCKED}.{BLOCKED}.213.91 caixa.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 caixaeconomica.com.br
    • {BLOCKED}.{BLOCKED}.213.91 caixaeconomica.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 caixaeconomicafederal.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 cef.com.br
    • {BLOCKED}.{BLOCKED}.213.91 cef.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 cielo.com.br
    • {BLOCKED}.{BLOCKED}.213.91 citibank.com
    • {BLOCKED}.{BLOCKED}.213.91 citibank.com.br
    • {BLOCKED}.{BLOCKED}.213.91 comprafacil.com.br
    • {BLOCKED}.{BLOCKED}.213.91 internetbanking.caixa.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 itau.com.br
    • {BLOCKED}.{BLOCKED}.213.91 itaupersonnalite.com.br
    • {BLOCKED}.{BLOCKED}.213.91 netcerto.com.br
    • {BLOCKED}.{BLOCKED}.213.91 santander.com.br
    • {BLOCKED}.{BLOCKED}.213.91 santandernet.com.br
    • {BLOCKED}.{BLOCKED}.213.91 shoptime.com.br
    • {BLOCKED}.{BLOCKED}.213.91 submarino.com.br
    • {BLOCKED}.{BLOCKED}.213.91 unibanco.com
    • {BLOCKED}.{BLOCKED}.213.91 unibanco.com.br
    • {BLOCKED}.{BLOCKED}.213.91 visanet.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.americanas.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.americanexpress.com
    • {BLOCKED}.{BLOCKED}.213.91 www.americanexpress.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bancobrasil.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bancodobrasil.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bancoitau.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bancopaulista.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bancoreal.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.banrisul.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bb.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bradesco.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.bvfinanceira.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.caixa.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.caixa.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomica.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomica.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomicafederal.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.caixaeconomicafederal.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 www.cef.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.cef.gov.br
    • {BLOCKED}.{BLOCKED}.213.91 www.cielo.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.citibank.com
    • {BLOCKED}.{BLOCKED}.213.91 www.citibank.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.comprafacil.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.itau.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.itaupersonnalite.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.netcerto.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.santander.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.santandernet.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.shoptime.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.submarino.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.unibanco.com
    • {BLOCKED}.{BLOCKED}.213.91 www.unibanco.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www.visanet.com.br
    • {BLOCKED}.{BLOCKED}.213.91 www2.americanexpress.com.br
    • {BLOCKED}.{BLOCKED}.213.91caixaeconomicafederal.com.br
"

Step 6

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