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TROJ_ZBOT.BYY

October 08, 2012
 Modified by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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. Once users access any of the monitored sites, it starts logging keystrokes. 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:

129,536 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

30 Jul 2010

Payload:

Drops files, Steals information

Infection Points

This Trojan arrives as a file downloaded from the following URLs:

  • http://{BLOCKED}izard.com/dee/dee.exe

Installation

This Trojan creates the following folders with attributes set to System and Hidden to prevent users from discovering and removing its components:

  • %Application Data%\{random1}
  • %Application Data%\{random2}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It injects itself into the following processes as part of its memory residency routine:

  • explorer.exe

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
{73CFE89E-3F12-80ED-7935-F6B7FDCAFB87} = %Application Data%\{random1}\{random}.exe

Dropping Routine

This Trojan drops the following files:

  • %Application Data%\{random1}\{random}.exe
  • %Application Data%\{random2}\{random}.irg

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Information Theft

This Trojan 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 accesses the following site to download its configuration file:

  • http://{BLOCKED}zard.com/dee/ger.ma

Once users access any of the monitored sites, it starts logging keystrokes.

It attempts to access a website to download a file which contains information where the Trojan can download an updated copy of itself, and where to send its stolen data. This configuration file also contains the following list of targeted bank-related websites from which it steals information:

  • !*.microsoft.com/*
  • !http://*myspace.com*
  • !http://*odnoklassniki.ru/*
  • !http://vkontakte.ru/*
  • *.de/portal/portal/*
  • https://*commerzbanking.de*
  • https://anti-phishing.ru/AZ777.old/ap/commerzbanking.de/
  • https://anti-phishing.ru/AZ777.old/ap/commerzbanking.de/script.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/DisplayStatementOfAssets.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/Login.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/_common.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/european.transfer.enter.data.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/history.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/itan.authorization.dispatch.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/itan.authorization.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/select.type.of.js
  • https://anti-phishing.ru/AZ777.old/ap/deutsche.de/send.authorization.js
  • https://anti-phishing.ru/AZ777.old/ap/fiducia.de/script.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/_euueberweisung.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/_sepaueberweisung.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/euuebereintrag.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/euueberfrage.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/euueberweisung.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/finanzstatus.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/kontodetails.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/login.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/sepauebereintrag.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/sepaueberfrage.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/sepaueberweisung.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/uebereintrag.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/umsatz.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.cgi/umswahl.js
  • https://anti-phishing.ru/AZ777.old/ap/sparkasse.portal/script.js
  • https://anti-phishing.ru/AZ777.old/bank.postbank.de.php
  • https://anti-phishing.ru/AZ777.old/inj_gate.php
  • https://banking.*/cgi/_euueberweisung.cgi*
  • https://banking.*/cgi/_sepaueberweisung.cgi*
  • https://banking.*/cgi/anfang.cgi*
  • https://banking.*/cgi/euuebereintrag.cgi*
  • https://banking.*/cgi/euueberfrage.cgi*
  • https://banking.*/cgi/euueberweisung.cgi*
  • https://banking.*/cgi/finanzstatus.cgi*
  • https://banking.*/cgi/kontodetails.cgi*
  • https://banking.*/cgi/login.cgi*
  • https://banking.*/cgi/sepauebereintrag.cgi*
  • https://banking.*/cgi/sepaueberfrage.cgi*
  • https://banking.*/cgi/sepaueberweisung.cgi*
  • https://banking.*/cgi/uebereintrag.cgi*
  • https://banking.*/cgi/umsatz.cgi*
  • https://banking.*/cgi/umswahl.cgi*
  • https://banking.postbank.de/app/finanzstatus.init.do*
  • https://banking.postbank.de/app/kontoumsatz.umsatz.*.do*
  • https://banking.postbank.de/app/kontoumsatz.umsatz.init.do;jsessionid=
  • https://banking.postbank.de/app/legitimation.exec.do;jsessionid=
  • https://banking.postbank.de/app/ueberweisung.init.do;jsessionid=
  • https://banking.postbank.de/app/ueberweisung.prep.do;jsessionid=
  • https://banking.postbank.de/app/verwaltung.status.init.do;jsessionid=
  • https://buildcareerjobs.com/https.html
  • https://finanzportal.fiducia.de*
  • https://login.facebook.com/*
  • https://meine.deutsche-bank.de*CreateEUStandardTransfer*
  • https://meine.deutsche-bank.de*DisplayFinancialOverview*
  • https://meine.deutsche-bank.de*DisplayStatementOfAssets*
  • https://meine.deutsche-bank.de*DisplayTransactions*
  • https://meine.deutsche-bank.de*StartOverseasRemittance*
  • https://meine.deutsche-bank.de*authorization*
  • https://meine.deutsche-bank.de*european.transfer.send.authorization*
  • https://meine.deutsche-bank.de*itan.authorization.dispatch.do*
  • https://meine.deutsche-bank.de/trxm/db/
  • https://meine.deutsche-bank.de/trxm/db/?*
  • https://meine.deutsche-bank.de/trxm/db/gvo/login/goto.nextStep.login.do?selector=login
  • https://my.hypovereinsbank.de/img/ico/logo.gif
  • https://my.hypovereinsbank.de/js/portal.js*
  • https://my.hypovereinsbank.de/login*
  • https://www.dresdner-privat.de/SSA_MLS_JAVASCRIPT/mlsgeneral.js*
  • https://www.dresdner-privat.de/servlet/P/SSA*do*
  • https://www.google.com/accounts/ig.gif
  • https://www.targobank.de/de/*cgi*
  • https://www.targobank.de/de/javascript/funcs_global.js*

The downloaded file contains information where the malware can download an updated copy of itself, and where to send its stolen data.

Note that the contents of the file, hence the list of websites to monitor, may change any time.

It attempts to steal information from the following banks and/or other financial institutions:

  • ANZ
  • Commerzbank
  • Deutsche Bank
  • Dresdner
  • Facebook
  • Fiducia
  • Microsoft
  • Myspace
  • Odnoklassniki
  • Vkontakte

Stolen Information

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

  • http://{BLOCKED}ourt.com/ger/gfhsk.php

Other Details

This Trojan did not exhibit backdoor routines during testing.

Variant Information

This Trojan has the following MD5 hashes:

  • 43d2e731f93da2a0202812db2bff385d

It has the following SHA1 hashes:

  • b21a50d4c8a338cc0af33ec8b2f54eb4d0c954aa

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.350.01

VSAPI OPR PATTERN Date:

30 Jul 2010

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 delete files detected as TROJ_ZBOT.BYY using the Recovery Console

[ Learn More ]

Step 3

Restore this modified 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\
    • {random}

Step 4

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
    • {73CFE89E-3F12-80ED-7935-F6B7FDCAFB87}=%Application Data%\{random1}\{random}.exe

Step 5

Search and delete these files

[ Learn More ]
There may be some component 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.
  • %Application Data%\{random1}\{random}.exe
  • %Application Data%\{random2}\{random}.irg

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_ZBOT.BYY. 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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