Trojan.Randsom.A

1. Creates the following files in the directory where the Trojan is executed.
   
   
   • corpstats.exe
   • winstart.exe
   • 004.exe
   • 005.exe
   • 006.exe
   • 007.exe
   • 008.exe
   • 009.exe
   • svchost.exe
   • data3.exe
   • data2.exe
   • data4.exe
   • dat1.bat
   • wpd.exe
   • ShutdownUtility.exe
     
     
     
2. Adds the value:
   
   "cleanup" = "%System%\oobe\setup\corpstats.exe"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnceEx
   
   so that it runs every time Windows starts.
   
   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).
   
   
3. May also create harmless temporary files in the following directory:
   
   C:\Documents and Settings\All Users\Application Data\OZ
   
   
4. May also create harmless temporary registry values under the following key:
   
   HKEY_CURRENT_USER\SOFTWARE\OZ Development\Applications
   
   
5. The Trojan then displays a dialog box with the following messages:
   
   "Deleted files are going to be saved into a hidden directory and replaced during uninstallation."
   "(1) files are being deleted every 30 minutes"
   
   
6. Displays the following text in full screen, along with two pornographic pictures:
   
   
   
   -----
   environment loaded
   windows locked
   
   listen up muthafucka
   is this computer valuable. it better not be.
   is this a business computer. it better not be.
   do you keep important company records or files on this computer. you'd better hope not.
   because there are files scattered all over it tucked away in
   invisible hidden folders undetectable by antivirus sofware
   the only way to remove them and this message is by a CIDN: number
   
   This X.aip will load everytime you start windows scattering more and more copies of iteslf until your computer is fried to a pulp. until then you may even notice other programs missing critical files.
   
   How to Remove it
   
   Simple. you must receive a CIDN: number from Western Union
   
   go to Western union, fill out the grey form labeled "SwiftPay" pay $10.99 as your customer access number enter "4 8 7 0 9 3 0 1 0 1 3 0 8 6 9 7"
   you may sign any name, i.e John Doe.
   and wait for a receipt from the clerk. Look on the top right-hand corner of the receipt for a number that starts with CIDN: i.e CIDN: 203-093-1903
   comback to this computer an enter your CIDN number. The uninstall process will begin.
   
   note: if you don't pay exactly $10.99 you will generate an invalid CIDN number and be forced to start all over.
   
   If you have a valid CIDN: Number and have problems uninstalling send a reuqest to
   unlock3713@yahoo.com
   
   I will research the problem and if applicable send a alternate CIDN: universal key by email.
   -----
   
   
7. Creates the file %Windir%\dat1.bat and executes it. This will perform a number of cd, dir and tree comands, which do not harm your system.
   
   Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).
   
   
8. May create the file %System%\bat.bat and execute it. This will after a delay shutdown the system.
   
   
9. Executes multiple processes if some of them are terminated it displays the following message:
   
   Yeah, We don't die, We multiply!
   Ctrl+Alt+Del isn't quite working today, is it? I'm not the sharpest tool in the shed but
   Crtl+Alt+Del is everyone's S.O.S
   

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.