Infostealer.Bancos.AA

Risk Level 1: Very Low

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Discovered: August 3, 2005

Updated: February 13, 2007 12:53:55 PM

Also Known As: PWSteal.Bancos.AA

Type: Trojan Horse

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

When Infostealer.Bancos.AA is executed, it performs the following actions:

Creates the following files:
- %System%\system.exe
- %System%\sys32.exe
- %System%\w16.dll
- %System%\w16s.dll
- %System%\win32.dll
  
  Note: %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).
Adds the value:

"System service" = "%System%\system.exe"

to the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

so that it runs every time Windows starts.
Sends an email with the following information using its own SMTP server at a predetermined IP address:

From:
mr_dj@access-one-click.com

To:
infected@access-one-click.com

Message body:
The message body contains some of the following information:
- Email User name
- Email Password
- POP3 server name for The BAT!
- POP3 server name for Outlook
- POP3 server name for Outlook Express
- The contents of the clipboard
- The IP address of the compromised computer
Registers itself as a service on Microsoft Windows 98 and ME computers.
Deletes all the URL cache and cookies.
Replaces the contents of hosts file with the following:

127.0.0.1 localhost 127.0.0.1 ad.doubleclick.net 127.0.0.1 ad.fastclick.net 127.0.0.1 ads.fastclick.net 127.0.0.1 ar.atwola.com 127.0.0.1 atdmt.com 127.0.0.1 avp.ch 127.0.0.1 avp.com 127.0.0.1 avp.com 127.0.0.1 avp.ru 127.0.0.1 awaps.net 127.0.0.1 banner.fastclick.net 127.0.0.1 banners.fastclick.net 127.0.0.1 ca.com 127.0.0.1 ca.com 127.0.0.1 click.atdmt.com 127.0.0.1 clicks.atdmt.com 127.0.0.1 customer.symantec.com 127.0.0.1 dispatch.mcafee.com 127.0.0.1 dispatch.mcafee.com 127.0.0.1 download.mcafee.com 127.0.0.1 download.mcafee.com 127.0.0.1 download.mcafee.com 127.0.0.1 download.microsoft.com 127.0.0.1 downloads.microsoft.com 127.0.0.1 downloads1.kaspersky-labs.com 127.0.0.1 downloads1.kaspersky-labs.com 127.0.0.1 downloads1.kaspersky-labs.com/updates 127.0.0.1 downloads2.kaspersky-labs.com 127.0.0.1 downloads3.kaspersky-labs.com 127.0.0.1 downloads4.kaspersky-labs.com 127.0.0.1 downloads-us1.kaspersky-labs.com 127.0.0.1 downloads-us2.kaspersky-labs.com 127.0.0.1 downloads-us3.kaspersky-labs.com 127.0.0.1 engine.awaps.net 127.0.0.1 fastclick.net 127.0.0.1 f-secure.com 127.0.0.1 f-secure.com 127.0.0.1 ftp.avp.ch 127.0.0.1 ftp.downloads2.kaspersky-labs.com 127.0.0.1 ftp.f-secure.com 127.0.0.1 ftp.kasperskylab.ru 127.0.0.1 ftp.sophos.com 127.0.0.1 go.microsoft.com 127.0.0.1 ids.kaspersky-labs.com 127.0.0.1 kaspersky.com 127.0.0.1 kaspersky-labs.com 127.0.0.1 liveupdate.symantec.com 127.0.0.1 liveupdate.symantec.com 127.0.0.1 liveupdate.symantec.com 127.0.0.1 liveupdate.symantecliveupdate.com 127.0.0.1 liveupdate.symantecliveupdate.com 127.0.0.1 mast.mcafee.com 127.0.0.1 mast.mcafee.com 127.0.0.1 mcafee.com 127.0.0.1 mcafee.com 127.0.0.1 media.fastclick.net 127.0.0.1 msdn.microsoft.com 127.0.0.1 my-etrust.com 127.0.0.1 my-etrust.com 127.0.0.1 nai.com 127.0.0.1 nai.com 127.0.0.1 networkassociates.com 127.0.0.1 networkassociates.com 127.0.0.1 office.microsoft.com 127.0.0.1 phx.corporate-ir.net 127.0.0.1 rads.mcafee.com 127.0.0.1 secure.nai.com 127.0.0.1 secure.nai.com 127.0.0.1 securityresponse.symantec.com 127.0.0.1 securityresponse.symantec.com 127.0.0.1 service1.symantec.com 127.0.0.1 sophos.com 127.0.0.1 sophos.com 127.0.0.1 spd.atdmt.com 127.0.0.1 support.microsoft.com 127.0.0.1 symantec.com 127.0.0.1 symantec.com 127.0.0.1 trendmicro.com 127.0.0.1 update.symantec.com 127.0.0.1 update.symantec.com 127.0.0.1 update.symantec.com 127.0.0.1 updates.symantec.com 127.0.0.1 updates.symantec.com 127.0.0.1 updates1.kaspersky-labs.com 127.0.0.1 updates1.kaspersky-labs.com 127.0.0.1 updates2.kaspersky-labs.com 127.0.0.1 updates3.kaspersky-labs.com 127.0.0.1 updates3.kaspersky-labs.com/updates 127.0.0.1 updates4.kaspersky-labs.com 127.0.0.1 updates5.kaspersky-labs.com 127.0.0.1 us.mcafee.com 127.0.0.1 us.mcafee.com 127.0.0.1 vil.nai.com 127.0.0.1 viruslist.com 127.0.0.1 viruslist.ru 127.0.0.1 windowsupdate.microsoft.com 127.0.0.1 www.avp.ch 127.0.0.1 avp.com 127.0.0.1 www.avp.com 127.0.0.1 www.avp.ru 127.0.0.1 www.awaps.net 127.0.0.1 ca.com 127.0.0.1 www.ca.com 127.0.0.1 www.fastclick.net 127.0.0.1 www.f-secure.com 127.0.0.1 www.f-secure.com 127.0.0.1 www.grisoft.com 127.0.0.1 www.kaspersky.com 127.0.0.1 www.kaspersky.ru 127.0.0.1 kaspersky.ru 127.0.0.1 www.kaspersky-labs.com 127.0.0.1 www.mcafee.com 127.0.0.1 www.mcafee.com 127.0.0.1 www.my-etrust.com 127.0.0.1 www.my-etrust.com 127.0.0.1 www.nai.com 127.0.0.1 www.nai.com 127.0.0.1 www.networkassociates.com 127.0.0.1 www.networkassociates.com 127.0.0.1 www.sophos.com 127.0.0.1 www.sophos.com 127.0.0.1 www.symantec.com 127.0.0.1 www.symantec.com 127.0.0.1 www.trendmicro.com 127.0.0.1 www.trendmicro.com 127.0.0.1 www.viruslist.com 127.0.0.1 www.viruslist.ru 127.0.0.1 www3.ca.com 69.10.133.233 www.bankone.com 69.10.133.233 bankone.com 216.147.48.91 www.lloydstsb.com 216.147.48.91 lloydstsb.com 216.147.48.91 www.lloydstsb.co.uk 216.147.48.91 lloydstsb.co.uk 67.19.70.52 hsbc.com 67.19.70.52 www.hsbc.com 67.19.70.52 hsbc.co.uk 67.19.70.52 www.hsbc.co.uk 83.102.165.14 halifax.co.uk 83.102.165.14 www.halifax.co.uk
Searches for and deletes the following files:
- C:\log.exe
- C:\log.vbs
- C:\web.exe
- C:\x.exe
- C:\y.exe
Attempts to hide its processes using %System%\w16.dll.
Connects to [http://]www.a-select.co.uk/[REMOVED] to check the Internet connection.
Opens a proxy server on TCP port 3398.
Checks the title of active Internet Explorer Windows to see if it matches any of the following strings:
- Connect to webmail.blueyonder.co.uk
- Please sign in - Microsoft Internet Explorer
- Yahoo! Mail - The best web-based email! - Microsoft Internet Explorer
- AOL Dial-Up Internet Service Provider with TopSpeed, Add AOL for Broadband to ANY High Speed Internet Connection - Microsoft Internet Explorer
- Mail.com - Microsoft Internet Explorer
- Welcome to Comcast High-Speed Internet! - Microsoft Internet Explorer
- USA.com - Microsoft Internet Explorer
- Prodigy - Home - Microsoft Internet Explorer
- AT&T - User Authentication - Microsoft Internet Explorer
- Mail :: Welcome to Highstream - Microsoft Internet Explorer
- Juno Internet Service - Value-priced Internet Service Provider - ISP - Free, low-cost and fast Internet Access - Microsoft Internet Explorer
- e-gold Account Access - Microsoft Internet Explorer
- e-Bullion: Account Login - Microsoft Internet Explorer
- Paymer - Microsoft Internet Explorer
- GDT Inc. - Gold-ebank & DigotGold - Microsoft Internet Explorer
- FF Bank - Microsoft Internet Explorer
- CityBank Online - Microsoft Internet Explorer
- INT Gold - Log In - Microsoft Internet Explorer
- INT Gold - Transfer Funds - Microsoft Internet Explorer
- PayPal - Log In - Microsoft Internet Explorer
- PayPal - Login - Microsoft Internet Explorer
- PayPal - Welcome - Microsoft Internet Explorer
- PayPal - Send Money - Microsoft Internet Explorer
- e-metal Payment Order From - Microsoft Internet Explorer
- ePayDirect -- Send Money to Anyone right from your desk - Microsoft Internet Explorer
- iKobo Money Transfer and Merchant Services - Send and Receive Money Online Instantly in 170 International Countries. - Microsoft Internet Explorer
- OdysseyNet - Internet Client Log On - Microsoft Internet Explorer
- Virtualgold.net - Simply a better payment solution - Microsoft Internet Explorer
- moneybookers.com - and money moves - Microsoft Internet Explorer
- Affiliate Check Cashing, Online Site Payments, Expatriate Health Insurance, e-gold Exchange, Transfers and Remitances - Microsoft Internet Explorer
- Gold Price :: Log in - Microsoft Internet Explorer
- Goldpay - A smart and simple way to move money - Microsoft Internet Explorer
- OmniPay: Account Logon - Microsoft Internet Explorer
- EMOCorp.com - Please Login to Your EMO Account - Microsoft Internet Explorer
- NetworkPay -- Global Payment Processing System - Microsoft Internet Explorer
- EZCardinc secure safe anonymous online internet transactions - Microsoft Internet Explorer
- Log in to Citizens Bank Online - Microsoft Internet Explorer
- Key Bank - Online Banking - Microsoft Internet Explorer
- SunTrust Online Banking - Microsoft Internet Explorer
- TCF Bank - Sign in to Online Banking - Microsoft Internet Explorer
- TCF BANK - TCF Express Trade Sign In - Microsoft Internet Explorer
- Login - Money Access - Microsoft Internet Explorer
- Wired Plastic - Microsoft Internet Explorer
- Wells Fargo Home Page - Microsoft Internet Explorer
- Star Connect Plus - Microsoft Internet Explorer
- Westamerica Bank - Microsoft Internet Explorer
- Visalia Community Bank - Microsoft Internet Explorer
- U.S. Bank Internet Banking - Microsoft Internet Explorer
- San Joaquin Bank - Microsoft Internet Explorer
- Bank of America | Home | Personal - Microsoft Internet Explorer
- Umpqua Bank - Online Banking Signup - Microsoft Internet Explorer
- The Vintage Bank - Microsoft Internet Explorer
- Merchants Bank of California - Microsoft Internet Explorer
- NetTeller Home Banking Log In - Microsoft Internet Explorer
- Montecito Bank & Trust ... Home Banking - Microsoft Internet Explorer
- Montecito Bank & Trust Online Banking - Microsoft Internet Explorer
- Premier West Bank - Microsoft Internet Explorer
- BankCard Services Net Access: Log In - Microsoft Internet Explorer
- On-line Banking Sign-On Launch Page - Microsoft Internet Explorer
- 24/7 Internet Banking - Microsoft Internet Explorer
- WELCOME TO PACIFIC STATE BANK - Microsoft Internet Explorer
- Login - Manufacturers Bank - Microsoft Internet Explorer
- Alliance Bank's Online Banking - Microsoft Internet Explorer
- Heritage Bank of Commerce - Microsoft Internet Explorer
- Bank of Petaluma - Microsoft Internet Explorer
- Welcome to Brentwood Bank's Online Banking - Microsoft Internet Explorer
- Borel Online Sign On - Microsoft Internet Explorer
- Bank of the Sierra - Business Switch Kit Form - Microsoft Internet Explorer
- DirectNET Internet Banking - Microsoft Internet Explorer
- [https://]www.downeysavingsonlinebanking.com/[REMOVED]/onlineserv/HB/signon.cgi - Microsoft Internet Explorer
- Fremont Bank - Microsoft Internet Explorer
- MoneyManager -- Your Financial Management Tool for the Future - Microsoft Internet Explorer
- Comerica Bank State Login - Microsoft Internet Explorer
- Home Banking Sign On - Microsoft Internet Explorer
- ICBanker - Microsoft Internet Explorer
- LloydsTSB online - Welcome - Microsoft Internet Explorer
- HSBC Bank plc: Internet Banking Log on - Microsoft Internet Explorer
- HSBC Internet Banking - Microsoft Internet Explorer
- EasyWeb - Microsoft Internet Explorer
- Login - Citizens(TM)NET - Microsoft Internet Explorer
- Login - Citizens(TM)NET Business - Microsoft Internet Explorer
- BMO Bank of Montreal Direct Banking - Microsoft Internet Explorer
- CIBC Online Banking - Microsoft Internet Explorer
- Banque Nationale en ligne - Microsoft Internet Explorer
- CWBdirect Login 4.2 - Microsoft Internet Explorer
- Scotia OnLine Sign-On - Microsoft Internet Explorer
- Login page for BDC clients - Microsoft Internet Explorer
- RBC Financial Group - Online Banking - Microsoft Internet Explorer
- RBC Action Direct Online Investing - Microsoft Internet Explorer
- Citibank Online - Microsoft Internet Explorer
- Citibank Online - Sign On - Microsoft Internet Explorer
- [https://]login.citibank.co.uk/[REMOVED]/login_128/login.asp - Microsoft Internet Explorer
- Internet Banking for GCB France - Microsoft Internet Explorer
- Citibank Canada Online Billing - Login - Microsoft Internet Explorer
- American Express - Microsoft Internet Explorer
- CSFB - Client Access - Log In - Microsoft Internet Explorer
- Banking@Credit-Suisse -- Login - Microsoft Internet Explorer
- Deutsche Bank Logon - Microsoft Internet Explorer
- Welcome to ICICI Bank e-business : Corporate Internet Banking. Start by entering your Corp ID - Microsoft Internet Explorer
- ICICI Bank - Microsoft Internet Explorer
- Laurentian Bank of Canada - Microsoft Internet Explorer
- Manulife Bank of Canada - Microsoft Internet Explorer
- Mellon Investor Services - Microsoft Internet Explorer
- Client ServiceDirect - Microsoft Internet Explorer
- Easy Access Banking Sign On - Microsoft Internet Explorer
- Web Business Banking - Microsoft Internet Explorer
- TD Waterhouse Home : - Microsoft Internet Explorer
- DaimlerChrysler Bank. Die Bank, die bewegt. - Microsoft Internet Explorer
- Dresdner Bank - Privatkundenportal - Microsoft Internet Explorer
- Dresdner Firmenfinanzportal - Microsoft Internet Explorer
- Bienvenido al servicio de Banca por Internet Lloyds TSB online - Microsoft Internet Explorer
- Danske Bank - Microsoft Internet Explorer
- BG Netbank - Microsoft Internet Explorer
- [http://]www.volksbank.de/[REMOVED] - Microsoft Internet Explorer
- Postbank Online Banking - Microsoft Internet Explorer
- Transaktionsmanager Deutsche Bank - Microsoft Internet Explorer
- laCaixa.es - Particulares - Microsoft Internet Explorer
- Bienvendino - Microsoft Internet Explorer
- Caixa Catalunya - Inici - Microsoft Internet Explorer
- [https://]bnyonline.com/[REMOVED]/scripts/cgiclnt.exe/CORE-Main%20Web/ND000_ - Microsoft Internet Explorer
- Bank One - online banking, home equity & mortgage loans, checking accounts, loan calculators - Microsoft Internet Explorer
- Capital One Online Account Services - Login - Microsoft Internet Explorer
- Connect to ecommerce.barcap.com
- Chase.com Home Page - Microsoft Internet Explorer
- commerzbanking - Microsoft Internet Explorer
- Connect to www.emarkets.nordea.com
- Bank of America | Online Banking | Transfer Funds | Add Account - Microsoft Internet Explorer
- Transferencias a otras cuentas de "La Caixa" - Microsoft Internet Explorer
- Barclays IBank - Microsoft Internet Explorer
- Acceso a Banca por Internet - Microsoft Internet Explorer
- Home Page Banca Intesa - Microsoft Internet Explorer
- Unicaja - Microsoft Internet Explorer
- Welcome to Shell New Orleans Federal Credit Union - Microsoft Internet Explorer
- Login to Online Banking - Microsoft Internet Explorer
- First Commonwealth Bank - Microsoft Internet Explorer
- Hillcrest Bank - Microsoft Internet Explorer
- Bills.com - Microsoft Internet Explorer
- The Northern Savings & Loan Company | Account Access | Log In - Microsoft Internet Explorer
- Kaiperm Federal Credit Union : ICU Home Banking - Microsoft Internet Explorer
- Star One Credit Union - Microsoft Internet Explorer
- Welcome to Eagle Community Credit Union's Online Express Home Banking Service - Microsoft Internet Explorer
- Home Federal of Grand Island - Microsoft Internet Explorer
- Arkansas Best Federal Credit Union - Microsoft Internet Explorer
- OCNB Online Banking Sign On - Microsoft Internet Explorer
- Northwest Resource FCU Online Banking - Microsoft Internet Explorer
- Navy Federal - Microsoft Internet Explorer
- DSFCU - Welcome to Desert Schools Federal Credit Union Home - Microsoft Internet Explorer
- Huntington National Bank - Microsoft Internet Explorer
- M&I Online Banking with Bill Payment - Microsoft Internet Explorer
  
  The Trojan also checks for the following Russian strings in the Window title:
Records the key strokes if a Window title matches any of the strings.
Adds the value:
"WebMailData" = "[LOGGED KEY STROKES]"

to the registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
Sends an email with the logged key strokes and the following information using its own SMTP server at a predetermined IP address:

From:
mr_dj@access-one-click.com

To:
report@access-one-click.com

Message body:
The message body contains some of the following information:
- Email User name
- Email Password
- POP3 server name for The BAT!
- POP3 server name for Outlook
- POP3 server name for Outlook Express
- The contents of the clipboard
- The IP address of the compromised computer

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: Masaki Suenga

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