Trojan.Satiloler.B

1. Creates a mutex named "_Toolbar_Class_32" so that only one instance of the Trojan is executed on the compromised computer.
   
   
2. Copies %System%\userinit.exe, which is a valid system file, as the following file and then deletes it:
   
   %Windir%\system\userinit.exe
   
   Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
   
   
3. Copies itself as:
   
   
   • %System%\userinit.exe
   • %ProgramFiles%\Common Files\system\lsass.exe
     
     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).
   • %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
     
     
4. Creates the following files:
   
   
   • %System%\xvid.dll
   • %System%\xvid.ini
   • %System%\divx.ini
     
     
5. Adds the value:
   
   "system" = "%ProgramFiles%\Common Files\system\lsass.exe"
   
   to the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
   
   so that it runs every time Windows starts.
   
   
6. Modifies the values:
   
   "SFCDisable" = "FFFFFF9D"
   "SFCScan" = "0"
   
   in the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   
   to disable Windows File Protection.
   
   
7. Adds the value:
   
   "System" = ""
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   
   
8. Modifies the original %System%\sfc_os.dll or sfc.dll file and its backup in %Windir%\dllcache in order to disable System File Protection.
   
   
9. Attempts to close windows that have the following titles:
   
   
   • Create rule for %s
   • Un processus cache requiert une connexion reseau.
   • Ne plus afficher cette invite
   • Un proceso oculto solicita acceso a la red
   • Aceptar
   • Warning: Components Have Changed
   • &Make changed component shared
   • Hidden Process Requests Network Access
   • Ein versteckter Prozess verlangt Netzwerkzugriff.
   • PermissionDlg
   • &Remember this answer the next time I use this program.
   • &Yes
   • Windows Security Alert
   • Allow all activities for this application
     
     
10. Attempts to end the following processes:
    
    
    • WINLDRA.EXE
    • NETSCAPE.EXE
    • OPERA.EXE
    • FIREFOX.EXE
    • MOZILLA.EXE
    • M00.EXE
    • WINTBPX.EXE
    • SWCHOST.EXE
    • SVOHOST.EXE
    • SVC.EXE
    • WINSOCK.EXE
    • SPOOLS.EXE
      
      
11. Attempts to disable the following programs:
    
    
    • C:\PROGRA~1\McAfee.com\PERSON~1\MpfAgent.exe
    • C:\PROGRA~1\McAfee.com\PERSON~1\MpfTray.exe
      
      
12. Steals the following information and saves it to %System%\desktops.ini:
    
    
    • POP3 Username
    • Password for Internet Explorer AutoComplete
    • TheBat passwords
    • e-gold account information
      
      
13. Searches for the following strings in the Web browser:
    
    
    • postbank.de
    • deutsche-bank.de
    • diba.de
    • 1822direkt.com
    • .haspa.de
    • .sparkasse-
    • mbs-potsdam.de
    • .homebanking-
    • .bankingportal.
    • dresdner-privat.de
    • .gad.de
    • citibank.de
    • .portal-banking.de
    • vr-ebanking.de
    • vr-networld-ebanking.de
    • cc-bank.de
    • commerzbanking.de
    • lacaixa.es
    • axabanque.fr/client/sauthentification
    • cahoot
    • egg
    • if.com
    • smile
    • first
    • nation
    • abbey
    • natwest
    • citi
    • barclay
    • allianc
    • bank
    • hsbc
    • lloyd
    • nwolb
    • online
    • hali
    • npbs
    • marbles
    • trade
    • rbs.
    • lacaixa.es
    • pin2
    • viabcp.com
    • pin
    • Payee_Account
    • bancaonline.
    • CLAVES
    • ebankinter.com
      
      
14. Logs the following Web activity to %System%\divx.ini:
    
    
    • URLs visited
    • Radio button and checkbox status
    • Keystrokes
      
      
15. Opens a proxy server on a random TCP port.
    
    
16. Posts the collected log files to [http://]fiv.bestswf.com/[REMOVED]/log.php.
    
    
17. Sends a HTTP request to [http://]fiv.bestswf.com/[REMOVED]/cmd.php with the following data gathered from the compromised computer and saves the response to %System%\xvid.ini:
    
    
    • Username
    • Geographical location
    • Opened port number

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.