Infostealer.Bankash.C

SUMMARY

Infostealer.Bankash.C is a Trojan horse program that attempts to steal user names and passwords for certain financial Web sites. The Trojan will also disable antivirus software.

NOTE : Definitions prior to May 10, 2006 may detect this threat as PWSteal.Bankash.C

Protection

• Virus Definitions (LiveUpdate™ Weekly) March 6, 2005
• Virus Definitions (Intelligent Updater) March 4, 2005

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium
• Deletes Files: Deletes files related to Microsoft AntiSypware.
• Releases Confidential Info: Steals usernames and passwords for various Web sites including financial institutions.
• Compromises Security Settings: Disables Microsoft AntiSpyware software.

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

When Infostealer.Bankash.C is executed, it performs the following actions:

1. May drop the following files:
   
   
   • %System%ASH.DLL
   • %Windir%email.log
     
     Notes:
   • %System% is a variable that refers to the System folder. By default this is C:WindowsSystem (Windows 95/98/Me), C:WinntSystem32 (Windows NT/2000), or C:WindowsSystem32 (Windows XP). %Windir% is a variable that refers to the Windows installation folder. By default, this is C:Windows or C:Winnt.
   • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:Windows or C:Winnt.
     
     
2. Attempts to create the following registry subkeys to register the .dll file:
   
   HKEY_CLASS_ROOTTypeLib{D941DA88-1DAA-4ED2-8946-ABABCF2A4C3F}
   HKEY_CLASS_ROOTCLSID{C6176B04-8896-4446-9939-E00EE94C420F}
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftCurrentVersionExplorerBrowser Helper Object{C6176B04-8896-4446-9939-E00EE94C420F}
   HKEY_CLASS_ROOTInterface{17A45F93-AEC8-440B-AC33-1BA9CC3192AC}
   HKEY_CLASS_ROOTTypeLib{D941DA88-1DAA-4ED2-8946-ABABCF2A4C3F}
   
   
3. May also create the following subkeys for its own operational purposes:
   
   HKEY_CLASSES_ROOTAntiSpy.AntiSpy
   HKEY_CLASSES_ROOTAntiSpy.AntiSpy.1
   
   
4. Monitors for alerts from firewall applications and attempts to hide these alerts, automatically creating ALLOW rules.
   
   
5. Searches for email addresses in files with .txt and .html extensions located in %System%Documents and Settings. It ignores addresses containing the following strings:
   
   
   • kaspersky
   • viruslist
   • avp.
   • f-secure
   • mcafee
   • admin
   • root
   • support
   • microsoft
   • nai.com
   • symantec
     
     
6. Stores the email addresses in %Windir%email.log.
   
   
7. Adds the values:
   
   "(Default)" = "list"
   "install_em" = "ok"
   "install_pw" = "ok"
   
   to the registry subkey:
   
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   
   
8. Attempts to gather all locally cached passwords, saving them to the file %Windir%pass.log.
   
   
9. Monitors Microsoft Internet Explorer continuously for access to the Web pages of the following financial institutions:
   
   
   • HSBC_COM_HK
   • IBLogin_COM
   • National_COM_AU
   • PT_ActivoBank7
   • PT_BPInet
   • Web_Da_Us_Citibank_Com
   • Westpac_NZ
   • Westpac_AU
   • BankCardServices_CO_UK
   • Halifax
   • RBSDigital
   • NatWest
   • Natwide
   • Lloyds
   • Cahoot
   • Abbey
   • HSBC_CO_UK
   • Anz_COM_AU_NZ
   • PT_FiniBanco
   • PT_BBVA_COM
   • PT_Caixadirecta_CGD
   • BankWest_COM_AU
     
     
10. 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.
    
    
11. Monitors Microsoft Internet Explorer for access to Web pages containing the following strings and logs keystrokes entered into these Web pages:
    
    
    • ba-ca.com
    • onba.zkb.ch
    • banking.bawag.com
    • raiffeisendirect.
    • ebankas.vb.lt
    • tatrabanka.sk
    • rba.hr
    • 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
      
      
12. Saves captured keystrokes to %Windir%form.log. Saves HTTP get requests to %Windir%eq.log.
    
    
13. Attempts to delete the following registry subkey in order to disable the Microsoft AntiSpyware application:
    
    HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun
    gcasServ
    
    
14. Attempts to disable the Microsoft AntiSpyware application by ending the following processes:
    
    
    • GCASCLEANER
    • GCASDTSERV
    • GCASINSTALLHELPER
    • GCASNOTICE
    • GCASSERV
    • GCASSERVALERT
    • GCASSWUPDATER
    • GCIPTOHOSTQUEUE
    • GIANTANTISPYWAREMAIN
    • GIANTANTISPYWAREUPDATER
      
      
15. Attempts to delete all files in the following folder:
    
    %ProgramFiles%Microsoft AntiSpyware
    
    Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:Program Files.
    
    
16. 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":

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

REMOVAL

The following instructions pertain to all Symantec antivirus products that support security risk detection.

1. Update the definitions.
2. Run a full system scan.
3. Delete any values added to the registry.
   

For specific details on each of these steps, read the following instructions.

1. To update the definitions
To obtain the most recent definitions, start your Symantec program and run LiveUpdate.


2. To run the scan

1. Start your Symantec antivirus program, and then run a full system scan.
   
2. If any files are detected, and depending on which software version you are using, you may see one or more of the following options:
   
   Note: This applies only to versions of Norton AntiVirus that support security risk detection. If you are running a version of Symantec AntiVirus Corporate Edition that supports security risk detection, and security risk detection has been enabled, you will only see a message box that gives the results of the scan. If you have questions in this situation, contact your network administrator.
   
   • Exclude (Not recommended): If you click this button, it will set the risk so that it is no longer detectable. That is, the antivirus program will keep the security risk on your computer and will no longer detect it to remove from your computer.
     
     
   • Ignore or Skip: This option tells the scanner to ignore the risk for this scan only. It will be detected again the next time that you run a scan.
     
     
   • Cancel: This option is new to Norton Antivirus 2005. It is used when Norton Antivirus 2005 has determined that it cannot delete a security risk. This Cancel option tells the scanner to ignore the risk for this scan only, and thus, the risk will be detected again the next time that you run a scan.
     
     To actually delete the security risk:
     • Click its file name (under the Filename column).
     • In the Item Information box that displays, write down the full path and file name.
     • Then use Windows Explorer to locate and delete the file.
       
       
   • Delete: This option will attempt to delete the detected files. In some cases, the scanner will not be able to do this.
     • If you see a message, "Delete Failed" (or similar message), manually delete the file.
     • Click the file name of the risk that is under the Filename column.
     • In the Item Information box that displays, write down the full path and file name.
     • Then use Windows Explorer to locate and delete the file.
       
       

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the risk may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

3. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. Read the document: How to make a backup of the Windows registry.

1. Click Start > Run.
2. Type regedit
3. Then click OK.
   
   
4. Navigate to the subkey:
   
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   
   
5. In the right pane, delete the value:
   
   "(Default)" = "list"
   "install_em" = "ok"
   "install_pw" = "ok"
   
   
6. Navigate to and delete the subkeys:
   
   HKEY_CLASS_ROOTTypeLib{D941DA88-1DAA-4ED2-8946-ABABCF2A4C3F}
   HKEY_CLASS_ROOTCLSID{C6176B04-8896-4446-9939-E00EE94C420F}
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftCurrentVersionExplorer
   Browser Helper Object{C6176B04-8896-4446-9939-E00EE94C420F}
   HKEY_CLASS_ROOTInterface{17A45F93-AEC8-440B-AC33-1BA9CC3192AC}
   HKEY_CLASS_ROOTTypeLib{D941DA88-1DAA-4ED2-8946-ABABCF2A4C3F}
   HKEY_CLASSES_ROOTAntiSpy.AntiSpy
   HKEY_CLASSES_ROOTAntiSpy.AntiSpy.1
   
   
7. Exit the Registry Editor.