Backdoor.Bifrose.E

1. Copies itself as one the following files:
   
   
   • C:\pligde.exe
   • %UserProfile%\Local Settings\pligde.exe
   • %UserProfile%\Local Settings\pligde.dat
   • %UserProfile%\Local Settings%\SysPr.prx
   • %System%\wmedia
   • %System%\wmedia.exe
   • %Windir%\explorer..exe
   • %Windir%\plugin1.dat
     
     Note:
   • %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\[CURRENT USER] (Windows NT/2000/XP).
   • %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 (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).
     
     
2. Adds the value:
   
   "stubpath" = "[PATH TO TROJAN]\pligde.exe"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
   \{A5CDF7EC-751B-46aa-AD69-4005FE080DE8}
   
   so that it runs every time Windows starts.
   
   Note: The [PATH TO TROJAN] variable corresponds to one of the two paths where the copy of the Trojan was dropped.
   
   
3. Adds the value:
   
   "StubPath" = "[PATH TO TROJAN]\wmedia.exe"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
   \{0002BB0C-D318-FD27-0505-050505040105}
   
   so that it runs every time Windows starts.
   
   
4. Adds the value:
   
   "stubpath" = "[PATH TO TROJAN]\explorer..exe s"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
   \{9B71D88C-C598-4935-C5D1-43AA4DB90836}
   
   so that it runs every time Windows starts.
   
   
5. Adds the value:
   
   "StartKey" = "[PATH TO TROJAN]\pligde.exe"
   "MSN Messenger" = "[PATH TO TROJAN]\explorer..exe"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that it runs every time Windows starts.
   
   
6. Hides its presence on the compromised computer by creating a new Internet Explorer instance and injecting itself into this process. All of the subsequent actions the Trojan performs will appear to be performed by this process.
   
   
7. Creates the following registry subkeys in order to store information:
   
   HKEY_CURRENT_USER\SOFTWARE\SKav
   HKEY_LOCAL_MACHINE\SOFTWARE\SKav
   HKEY_LOCAL_MACHINE\SOFTWARE\Wget
   HKEY_CURRENT_USER\Software\Wget
   
   
8. Opens a back door on the compromised computer by using Internet Explorer to connect to the following server on TCP port 1863:
   
   210.71.186.43
   
   This allows a remote attacker to send and execute shell commands, which enable the attacker to perform various unauthorized actions on the compromised computer.
   
   
9. Periodically attempts to access the following Web site:
   
   taipei2002.9966.org
   
   
10. Steals the keys or serial numbers of the following games, if they are installed on the compromised computer:
    
    
    • Hidden & Dangerous 2
    • Chrome
    • NOX
    • Command and Conquer: Red Alert 2
    • Command and Conquer: Red Alert
    • Command and Conquer: Tiberian Sun
    • Rainbow Six III RavenShield
    • Nascar Racing 2003
    • Nascar Racing 2002
    • NHL 2003
    • NHL 2002
    • FIFA 2003
    • FIFA 2002
    • Shogun: Total War: Warlord Edition
    • Need For Speed: Underground
    • Need For Speed Hot Pursuit 2
    • Medal of Honor: Allied Assault: Spearhead
    • Medal of Honor: Allied Assault: Breakthrough
    • Medal of Honor: Allied Assault
    • Global Operations
    • Command and Conquer: Generals
    • James Bond 007: Nightfire
    • Command & Conquer: Generals Zero Hour
    • Black and White
    • Battlefield Vietnam
    • Battlefield 1942: Secret Weapons of WWII
    • Battlefield 1942: Road To Rome
    • Battlefield 1942
    • Freedom Force
    • IGI 2: Covert Strike
    • Unreal Tournament 2004
    • Unreal Tournament 2003
    • Soldiers Of Anarchy
    • Legends of Might and Magic
    • Industry Giant 2
    • Half-Life
    • Gunman Chronicles
    • The Gladiators
    • Counter-Strike (Retail version)
      
      
11. Logs keystrokes, and may steal the following sensitive information:
    
    
    • ICQ user and password
    • Protected Storage passwords
    • cached passwords
    • visited URLs
      
      
12. Stores any information it gathers or steals in the following file:
    
    %UserProfile%\Local Settings%\SysPr.prx
    
    The Trojan is able to send this information to a remote server.

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.