Discovered: March 15, 2005
Updated: February 13, 2007 12:53:45 PM
Also Known As: PWSteal.Bankash.D
Type: Trojan Horse
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
When Infostealer.Bankash.D is executed, it performs the following actions:
- May drop the file %System%\ASH.DLL.
Notes: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP). %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
- Creates the following registry subkeys:
HKEY_CLASS_ROOT\CLSID\{32E9E0E2-02C7-4418-8E3B-137A21088799}
HKEY_CLASS_ROOT\TypeLib\{41D290C3-055E-480B-B46B-0BDDA1E4858D}
HKEY_CLASS_ROOT\Interface\{DA2EBA6F-B221-45ED-A17A-07339F31CF60}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CurrentVersion\Explorer
\Browser Helper Object\{32E9E0E2-02C7-4418-8E3B-137A21088799}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AntiSpy.AntiSpy
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AntiSpy.AntiSpy.1
to register the .dll file.
- Creates the following subkeys:
HKEY_CLASSES_ROOT\AntiSpy.AntiSpy
HKEY_CLASSES_ROOT\AntiSpy.AntiSpy.1
- Monitors alert messages from firewall applications that contain the following strings:
- Microsoft Internet Explorer
- Are you sure you want to navigate away from this page?
- Warning: Components Have Changed
- Warning: some components changed
- Hidden Process Requests Network Access
- Windows Security Alert
- Adds the value:
"Start Page" = "about:blank"
to the registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
so that the start page of Internet Explorer is changed.
- Searches for email addresses in files with the following extensions:
- .xml
- .xls
- .eml
- .vbs
- .rtf
- .uin
- .doc
- .oft
- .msg
- .dbx
- .adb
- .wab
- .tbb
- .asp
- .ph*
- .pl*
- .tx*
- .*ht*
It ignores addresses containing the following strings:
- kaspersky
- viruslist
- avp.
- f-secure
- mcafee
- admin
- root
- support
- microsoft
- nai.com
- symantec
- Stores the email addresses in %Windir%\email.log.
Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
- Adds the values:
"install_em" = "ok"
"install_pw" = "ok"
to the registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- Attempts to gather all locally cached passwords, saving them to the file %Windir%\pass.log.
- Monitors Microsoft Internet Explorer continuously for access to the Web pages of the following financial institutions:
- SORRY_SPARK
- SORRY_DEUTCH2
- SORRY_COMMERZ
- BOS_Halifax
- VR_DEU
- HOME_DEU
- SORRY_CITY
- HELPER_PAGE
- HSBC_COM_HK
- IBLogin_COM
- BankWest_COM_AU
- National_COM_AU
- PT_ActivoBank7
- PT_Caixadirecta_CGD
- PT_BPInet
- PT_FiniBanco
- PT_BBVA_COM
- Web_Da_Us_Citibank_Com
- Anz_COM_AU_NZ
- Westpac_NZ
- Westpac_AU
- BankCardServices_CO_UK
- Halifax
- RBSDigital
- NatWest
- Natwide
- Lloyds
- Cahoot
- Barclays
- Abbey
- HSBC_CO_UK
- Displays a fake Web page when the browser attempts to access the Web sites of the above financial institutions. Logs all data entered into these fake Web pages.
- Monitors Microsoft Internet Explorer for access to Web pages containing the following strings and starts logging keystrokes entered into these Web pages:
- ba-ca.com
- onba.zkb.ch
- banking.bawag.com
- raiffeisendirect
- ebankas.vb.it
- tatrabanka.sk
- rba.hr
- Monitors Microsoft Internet Explorer for access to Web pages containing the following strings and stops logging keystrokes:
- safeform.com
- northeast.on.ca
- salesforce.com
- prudential.com.hk
- sammikk.com
- samsunggsbn.com
- sbc.com
- s-central.com.au
- ebay
- sciamdigital.com
- scicollege.org.sg
- upjs.sk
- eutelsat.net
- searchfit.org
- seatbooker.net
- sebra.com
- yimg.com
- acadiau.ca
- adultfriendfinder.com
- advisor.com
- authorize.net
- bearshare.com
- betbanking.com
- bnpparibas.net
- c1hrapps.com
- customersvc.com
- konetic.org
- delias.com
- deluxepass.com
- directnic.com
- directsex.com
- earthport.com
- elance.com
- element5.com
- elsevier
- emetrix.com
- e-registernow.com
- europeonline.com
- ezpeer.com
- fredericks.com
- gevalia.com
- hilton.com
- hostdozy.com
- hotbar.com
- idx.com.au
- indigosp.com
- infusion-studios.com
- intuitcanada.com
- reuters.com
- kent.net
- lkw-walter.com
- medibank.com.au
- mouse2mobile.com
- mysylvan.com
- nacelink.com
- nai.com
- netbilling.com
- netfirms.com
- netspeed.com.au
- nike.com.hk
- novuslink.net
- nzqa.govt.nz
- oberon-media.com
- onlineaccess.net
- optusnet.com.au
- orcon.net
- ordering.co.uk
- oztralia.com
- register.com
- safesite.com
- shaw.ca
- billerweb.com
- sms.ac
- sparkart.com
- sparknotes.com
- starbiz.net.sg
- telusmobility.com
- thewheelconnection.com
- tickle.com
- trekblue.com
- tsn.cc
- ubi.com
- vandyke.com
- w2express.com
- mgm-mirage.com
- webeweb.net
- wn.com.au
- securecart.net
- secureordering.com
- secureserver.net
- imrworldwide.com
- playstation.com
- western-inventory.com
- securewebexchange.com
- securitymetrics.com
- selfmgmt.com
- t-mobile.co.uk
- xtra.co.nz
- canon-europe.com
- senecac.on.ca
- sephora.com
- liveperson.net
- ariba.com
- sympatico.ca
- xs4all.nl
- macau.ctm.net
- rogers.com
- sfgov.org
- cic.gc.ca
- vodafone.co.uk
- hku.hk
- sfa.prudential.com.sg
- shkcorpws5.shkp.com
- ecompanystore.com
- o2online.de
- shopadmin.daum.net
- shoppersoptimum.ca
- go-fia.com
- zoovy.com
- shopundco.com
- shutterfly.com
- signup.sprint.ca
- silicon-power.com
- singnet.com.sg
- simplyhotels.com
- sims.sfu.ca
- singaporeair.com
- site-secure.com
- esdlife.com
- flextronics.com
- cometsystems.com
- snapfish.com
- solo3.nordea.fi
- soccer.com
- hkuspace.org
- soundclick.com
- swamp.lan
- spiritair.com
- sportingbet.com
- sportodds.com
- worldgaming.net
- adaptec.com
- sqnet.com.sg
- srp.org.sg
- ains.com.au
- campoints.net
- ingrammicro.com
- kundenserver.de
- speedera.net
- farlep.net
- lanck.net
- .sok
- monster.com
- ihost.com
- gigaisp.net
- webtrendslive.com
- a-net.com
- puma.com
- apple.com
- streamload.com
- maximonline.com
- look.ca
- supergo.com
- cablebg.net
- dell
- sony
- symantec
- inlandrevenue.gov.uk
- tbihosting.com
- quickbooks.com
- techdata.com
- telpacific.com.au
- telstra.com
- freedom.net
- recruitsoft.com
- tepore.com
- theaa.com
- three.com.hk
- ticketmaster.com
- ultrastar.com
- ti.com
- tirerack.com
- tm.net.my
- tmi-wwa.com
- tdcwww.net
- stanfordalumni.org
- 012.net
- starhubshop.com.sg
- datasvit.net
- ssdcl.com.sg
- music
- iinet.net.au
- iprimus.com.au
- hp.com
- game
- towerhobbies.com
- travel.com.au
- travel.priceline.com
- travelclub.swiss.com
- travelcommunications.co.uk
- trivita.com
- trust1.com
- trustinternational.com
- yorku.ca
- preschoicefinancial.com
- united.intranet.ual.com
- unixcore.com
- uwindsor.ca
- ucas.co.uk
- ups.com
- yesasia.com
- usafis.org
- uscden.net
- uscitizenship.info
- va-bank.com
- vasa.slsp.sk
- veloz.com
- victoriassecret.com
- videotron.com
- mcafee.com
- virginblue.com.au
- virginmobileusa.com
- vodafone
- vpost.com.sg
- vutbr.cz
- opusit.com.sg
- ibm.com
- aircanada.ca
- walgreens.com
- watchguard.com
- icq.com
- ych.com
- uottawa.ca
- uoguelph.ca
- there.com
- webassign.net
- comcast.net
- douglas.bc.ca
- carleton.ca
- mcgill.ca
- mcmaster.ca
- queensu.ca
- sheridanc.on.ca
- ubc.ca
- unb.ca
- .ac.at
- .ac.nz
- .ust.hk
- microsoft.com
- guidehome.com
- sap-ag.de
- nwa.com
- webzdarma.cz
- intel.com
- bigpond.net.au
- willhill.com
- .ac.uk
- t-mobile.com
- uwaterloo.ca
- delawarenorth.com
- worldwinner.com
- worth1000.com
- wrem.sis.yorku.ca
- sierraclub.org
- serviticket.com
- yagma.com
- yes.com.hk
- .edu
- yourastrologysite.com
- ytv.com
- .o2.co.uk
- zwallet.com
- Saves captured keystrokes to %Windir%\form.log.
- Saves HTTP GET requests to %Windir%\req.log.
- Attempts to delete the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\gcasServ
in order to disable the Microsoft AntiSpyware application.
- Attempts to disable the Microsoft AntiSpyware application by ending the following processes:
- GCASCLEANER
- GCASDTSERV
- GCASINSTALLHELPER
- GCASNOTICE
- GCASSERV
- GCASSERVALERT
- GCASSWUPDATER
- GCIPTOHOSTQUEUE
- GIANTANTISPYWAREMAIN
- GIANTANTISPYWAREUPDATER
- Attempts to delete all files in the following folders:
- %ProgramFiles%\Microsoft AntiSpyware
- %ProgramFiles%\Common Files\Symantec Shared
- %ProgramFiles%\Kaspersky Lab
- %ProgramFiles%\McAfee
- %ProgramFiles%\Common Files\Network Associates
- %ProgramFiles%\Norton Antivirus\
Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
- Periodically tries to download an updated copy of itself via FTP or HTTP.
Recommendations
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
- Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
- Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
- Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
- Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
- Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
- Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
- If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
- Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
- Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
- Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
- Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
- If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
- For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Asuka Yamamoto
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