TSPY_ZBOT.US

 Analysis by: Alvin Bacani

 ALIASES:

VirTool:Win32/DelfInject.gen!AC (Microsoft); Trojan-Spy.Win32.Zbot.dwu (Kaspersky)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This spyware also has rootkit capabilities, which enables it to hide its processes and files from the user.

  TECHNICAL DETAILS

File Size:

397,312 bytes

Memory Resident:

Yes

Initial Samples Received Date:

07 Apr 2009

Payload:

Steals information

Infection Points

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

  • http://www.{BLOCKED}ad.info/ldrzif2.exe

Installation

This spyware then creates the following non-malicious file(s):

  • %System%\wsnpoem\audio.dll - used to save the gathered information
  • %System%\wsnpoem\video.dll - copy of the encrypted downloaded file

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It injects itself into the following processes running in the affected system's memory:

  • winlogon.exe
  • svchost.exe

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

  • %System%\wsnpoem

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • __SYSTEM__91C38905__

Autostart Technique

This spyware modifies the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\ CurrentVersion\Winlogon
Userinit = %System%\Userinit.exe,%System%\ntos.exe,

(Note: The default value data of the said registry entry is "%System%\Userinit.exe,".)

Other System Modifications

This spyware also creates the following registry entry(ies) as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Network
UID = {computer name}_{random numbers}

Rootkit Capabilities

This spyware also has rootkit capabilities, which enables it to hide its processes and files from the user.

Information Theft

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

  • http://www.{BLOCKED}ad.info/cfgzif2.bin

Its configuration file contains the following information:

  • URL to download an updated copy of itself
  • URL to send stolen data
  • list of targeted bank-related Web sites to monitor from which it steals information

Stolen Information

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

  • http://www.{BLOCKED}ad.info/z2/s.php

NOTES:

It checks for the presence of the following processes which, are related to Outpost Personal Firewall and ZoneLabs Firewall Client:

  • outpost.exe
  • zlclient.exe

It terminates if either of the said processes exist. This is to ensure that the spyware will run uninterrupted.

This configuration file also contains the following list of targeted bank-related Web sites to monitor from which it steals information:

  • http://*myspace.com*
  • *.ebay.com/*eBayISAPI.dll?*
  • *//mail.yandex.ru/
  • *//mail.yandex.ru/index.xml
  • *//money.yandex.ru/
  • *//money.yandex.ru/index.xml
  • */my.ebay.com/*CurrentPage=MyeBayPersonalInfo*
  • *banquepopulaire.fr/*
  • *wellsfargo.com/*
  • @*.bv-i.bancodevalencia.es/*
  • @*banesnet.banesto.es
  • @*caja-granada.es/cgi-bin/*
  • @https://*.e-gold.com/*
  • @https://*factor2*
  • @https://*ingdirect.com.au/client/Login.aspx*
  • @https://*westpac.com.au/esis/Login/SrvPage*
  • @https://carnet.cajarioja.es/banca3/*
  • @https://cuviewpoint.net/mvptartan/login.asp*
  • @https://factor2b.inetbank.net.au/factor2da3/factor2login.jsp
  • @https://intelvia.cajamurcia.es/cgi-bin/INclient_2043
  • @https://lo2.lacaixa.es/*
  • @https://mvp1.sccu.com.au/*/Login.asp
  • @https://net.kutxa.net/jkn_opkn/*
  • @https://netaccess2.qtcu.com.au/*/ntv45.asp?wci=entry
  • @https://netbank.selectcu.com.au/*/login.asp*
  • @https://netteller.resourcescu.com.au/*/ntv45.asp?WCI=entry
  • @https://netteller.tsw.com.au/*/ntv45.asp?wci=entry
  • @https://oi.cajamadrid.es/CajaMadrid/oi/pt_oi/Login/login
  • @https://oie.cajamadridempresas.es/CajaMadrid/oie/pt_oie/Login/login_oie_1
  • @https://www.ardil.bancogallego.es/servlet/*
  • @https://www.caixanova.es/cgi-bin/INclient_*
  • @https://www.caixatarragona.es/esp/sec_1/*
  • @https://www.cajabadajoz.es/cgi-bin/INclient_6010
  • @https://www.cajacanarias.es/cgi-bin/INclient_6065*
  • @https://www.cajadeavila.es*
  • @https://www.cajasur.es/cgi-bin/INclient_4024
  • @https://www.cajavital.es/Appserver/*
  • @https://www.ccm.es/cgi-bin/INclient_6105
  • @https://www.clavenet.net/cgi-bin/*
  • @https://www1.ibercajadirecto.com/ibercaja/asp/Login.asp
  • @https://www2.bancopopular.es/Bpemotor
  • @https://wwws.sanostra.es/cgi-bin/INclient_2051*
  • http://*.osmp.ru/
  • http://caixasabadell.net/banca2/tx0011/0011.jsp
  • https://*bancaja.es/*
  • https://*cajamar.es/BE/extern/htm/login.html*
  • https://*citibank.ru/*Signon*
  • https://*citibank.ru/RUGCB/JPS/portal/BusLocSwitch.*
  • https://*ebgempresa.es/*
  • https://*gruposantander.es/*
  • https://*rbkmoney.ru/client/index.aspx*
  • https://*westpac.com.au/wtwt/startpage*
  • https://areasegura.banif.es/bog/bogbsn*
  • https://banca.cajaen.es/Jaen/INclient.jsp
  • https://bancaonline.openbank.es/servlet/PProxy?*
  • https://banesnet.banesto.es/*/loginEmpresas.htm
  • https://banking*.anz.com/*
  • https://banking.*.de/cgi/ueberweisung.cgi/*
  • https://brokerage.comdirect.de/servlet/*TAN*
  • https://cardsonline-consumer.com/RBSG_Consumer/VerifyLogin.do
  • https://carnet.cajarioja.es/banca3/tx0011/0011.jsp
  • https://cipehb*.cdg.citibank.de/HomeBanking*?_D=WorkArea&*
  • https://easyweb*.tdcanadatrust.com/servlet/*FinancialSummaryServlet*
  • https://empresas.gruposantander.es/WebEmpresas/servlet/webempresas.servlets.*
  • https://extranet.banesto.es/*/loginParticulares.htm
  • https://extranet.banesto.es/npage/OtrosLogin/LoginIBanesto.htm
  • https://finanzportal.fiducia.de/*?rzid=*&rzbk=*
  • https://finanzportal.fiducia.de/ebanking*Action=*
  • https://finanzportal.fiducia.de/ebbg2/portal?token=*
  • https://hb.quiubi.it/newSSO/x11logon.htm
  • https://home.cbonline.co.uk/login.html*
  • https://home.ybonline.co.uk/login.html*
  • https://home.ybonline.co.uk/ral/loginmgr/*
  • https://home2ae.cd.citibank.ae/CappWebAppAE/producttwo/capp/action/signoncq.do
  • https://ibank.barclays.co.uk/olb/x/LoginMember.do
  • https://ibank.internationalbanking.barclays.com/logon/icebapplication*
  • https://ibanking.banksa.com.au/InternetBanking/viewAccountPortfolio.do*
  • https://ibanking.stgeorge.com.au/InternetBanking/viewAccountPortfolio.do*
  • https://intelvia.cajamurcia.es/2043/entrada/01entradaencrip.htm
  • https://internetbanking.aib.ie/hb1/roi/signon
  • https://internetbanking.gad.de/*/portal?bankid=*
  • https://internetbanking.gad.de/banking/*
  • https://light.webmoney.ru/default.aspx
  • https://lot-port.bcs.ru/names.nsf?#ogin*
  • https://montevia.elmonte.es/cgi-bin/INclient_2098*
  • https://net.kutxa.net/jkn_opkn/tmpl/es/loginkn.jsp*
  • https://oi.cajamadrid.es/CajaMadrid/oi/pt_oi/Login/login
  • https://oie.cajamadridempresas.es/CajaMadrid/oie/pt_oie/Login/login_oie_1
  • https://olb2.nationet.com/MyAccounts/frame_MyAccounts_WP2.asp*
  • https://olb2.nationet.com/signon/signon*
  • https://online*.lloydstsb.co.uk/logon.ibc
  • https://online-business.lloydstsb.co.uk/customer.ibc
  • https://online-offshore.lloydstsb.com/customer.ibc
  • https://online.wamu.com/Servicing/Servicing.aspx?targetPage=AccountSummary
  • https://online.wellsfargo.com/das/cgi-bin/session.cgi*
  • https://online.wellsfargo.com/login*
  • https://online.wellsfargo.com/signon*
  • https://onlinebanking#.wachovia.com/myAccounts.aspx?referrer=authService
  • https://onlinebanking.nationalcity.com/OLB/secure/AccountList.aspx
  • https://onlinebanking.norisbank.de/norisbank/*.do?method=*
  • https://onlinebanking.norisbank.de/norisbank/login.do?method=login*
  • https://onlineeast#.bankofamerica.com/cgi-bin/ias/*/GotoWelcome
  • https://pastornetparticulares.bancopastor.es/SrPd*
  • https://privati.internetbanking.bancaintesa.it/sm/login/IN/box_login.jsp
  • https://probanking.procreditbank.bg/main/main.asp*
  • https://resources.chase.com/MyAccounts.aspx
  • https://rupay.com/index.php
  • https://scrigno.popso.it*
  • https://web.da-us.citibank.com/*BS_Id=MemberHomepage*
  • https://web.da-us.citibank.com/cgi-bin/citifi/portal/l/autherror.do*
  • https://web.da-us.citibank.com/cgi-bin/citifi/portal/l/l.do
  • https://web.secservizi.it/siteminderagent/forms/login.fcc
  • https://welcome23.smile.co.uk/SmileWeb/start.do
  • https://welcome27.co-operativebank.co.uk/CBIBSWeb/start.do
  • https://www#.citizensbankonline.com/*/index-wait.jsp
  • https://www#.usbank.com/internetBanking/LoginRouter
  • https://www*.banking.first-direct.com/1/2/*
  • https://www.53.com/servlet/efsonline/index.html*
  • https://www.bancajaproximaempresas.com/ControlEmpresas*
  • https://www.bancoherrero.com/es/*
  • https://www.bbvanetoffice.com/local_bdno/login_bbvanetoffice.html
  • https://www.bgnetplus.com/niloinet/login.jsp
  • https://www.caixagirona.es/cgi-bin/INclient_2030*
  • https://www.caixalaietana.es/cgi-bin/INclient_2042
  • https://www.caixaontinyent.es/cgi-bin/INclient_2045
  • https://www.caixatarragona.es/esp/sec_1/oficinacodigo.jsp
  • https://www.caja-granada.es/cgi-bin/INclient_2031
  • https://www.cajabadajoz.es/cgi-bin/INclient_6010*
  • https://www.cajacanarias.es/cgi-bin/INclient_6065
  • https://www.cajacirculo.es/ISMC/Circulo/acceso.jsp
  • https://www.cajadeavila.es/cgi-bin/INclient_6094
  • https://www.cajalaboral.com/home/acceso.asp
  • https://www.cajasoldirecto.es/2106/*
  • https://www.cajavital.es/Appserver/vitalnet*
  • https://www.ccm.es/cgi-bin/INclient_6105
  • https://www.citibank.de*
  • https://www.clavenet.net/cgi-bin/INclient_7054
  • https://www.dab-bank.com*
  • https://www.dresdner-privat.de/servlet/*
  • https://www.e-gold.com/acct/balance.asp*
  • https://www.e-gold.com/acct/li.asp
  • https://www.ebank.hsbc.co.uk/main/IBLogon.jsp
  • https://www.fibancmediolanum.es/BasePage.aspx*
  • https://www.gbw2.it/cbl/jspPages/form_login_AV.jsp*
  • https://www.gruposantander.es/bog/sbi*?ptns=acceso*
  • https://www.gruppocarige.it/grps/vbank/jsp/login.jsp
  • https://www.halifax-online.co.uk/_mem_bin/*
  • https://www.halifax-online.co.uk/_mem_bin/formslogin.asp*
  • https://www.halifax-online.co.uk/MyAccounts/MyAccounts.aspx*
  • https://www.hsbc.co.uk/1/2/*
  • https://www.in-biz.it*
  • https://www.isbank.com.tr/Internet/ControlLoader.aspx*
  • https://www.iwbank.it/private/index_pub.jhtml*
  • https://www.mybank.alliance-leicester.co.uk/login/*
  • https://www.nwolb.com/Login.asp*
  • https://www.nwolb.com/Login.aspx*
  • https://www.paypal.com/*/webscr?cmd=_account
  • https://www.paypal.com/*/webscr?cmd=_login-done*
  • https://www.rbsdigital.com/Login.asp*
  • https://www.sabadellatlantico.com/es/*
  • https://www.suntrust.com/portal/server.pt*parentname=Login*
  • https://www.unicaja.es/PortalServlet*
  • https://www.uno-e.com/local_bdnt_unoe/Login_unoe2.html
  • https://www.us.hsbc.com/*
  • https://www.vr-networld-ebanking.de/ebanking*Action=*
  • https://www.vr-networld-ebanking.de/index.php?RZKZ=*&RZBK=*
  • https://www.wellsfargo.com/*
  • https://www2.bancopopular.es/AppBPE/servlet/servin*
  • https://www3.netbank.commbank.com.au/netbank/bankmain*

Note that the contents of the file, hence the list of Web sites to monitor, may change any time. Once users access any of the monitored sites, this spyware starts logging keystrokes.

This Spyware attempts to retrieve information from the following list of banking institutions:

  • AIB
  • Alliance & Leicester
  • ANZ
  • Banca Intesa
  • Bancaja
  • Banco Herrero
  • Banco Pastor
  • Banco Popular
  • Banesto
  • Banif
  • Bank of America
  • Banque Populaire
  • Barclays
  • BBVA
  • BG Net Plus
  • BrokerCreditService
  • Caixa Girona
  • Caixa Laietana
  • Caixa Ontinyent
  • Caixa Sabadell
  • Caixa Tarragona
  • Caja Badajoz
  • Caja Canarias
  • Caja Circulo
  • Caja de Avila
  • Caja de Jaen
  • Caja Granada
  • Caja Laboral
  • Caja Madrid
  • Caja Murcia
  • Caja Vital
  • Cajarioja
  • Cajasol
  • CCM
  • Chase
  • Citibank
  • Citizens
  • Clavenet
  • Clydesdale
  • Co-Operativebank
  • Comdirect
  • DAB
  • Dresdner
  • E-Gold
  • Ebay
  • Fibanc Mediolanum
  • Fiducia
  • Fifth Third
  • First Direct
  • GAD
  • Gruppo Carige
  • Halifax
  • HSBC
  • IS Bank
  • IW Bank
  • Kutxanet
  • Lloyds
  • National City
  • Nationwide
  • Natwest
  • Openbank
  • OSPM
  • PayPal
  • Procredit
  • Qui UBI
  • Raiffeisen
  • RBS
  • Rupay
  • Sabadell Atlantico
  • Santander
  • Scrigno
  • Secservizi
  • Smile
  • Suntrust
  • TD Canada Trust
  • Unicaja
  • Uno-E
  • US Bank
  • Volksbanken Raiffeisenbanken
  • Wachovia
  • Washington Mutual
  • Webmoney Keeper Light
  • Wells Fargo
  • Yandex
  • Yorkshire

Note that the list may change anytime.

  SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

5.883.00

VSAPI OPR PATTERN Date:

07 Apr 2009

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

Scan your computer with your Trend Micro product and note files detected as TSPY_ZBOT.US

Step 3

Identify and delete files detected as TSPY_ZBOT.US using the Recovery Console

[ Learn More ]

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network
    • UID = {computer name}_{random numbers}

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Winlogon
    • From: Userinit = %System%\Userinit.exe,%System%\ntos.exe,
      To: Userinit = %System%\Userinit.exe,

Step 6

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.
  • %System%\wsnpoem

Step 7

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.US. 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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