W32.Spybot.LXJ

1. Copies itself as the following file, and sets the attributes to hidden, read-only, and system:
   
   %System%\[Random file name].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).
   
   
2. Creates the following files:
   
   
   • %SystemDrive%\boot.exe
   • %SystemDrive%\msdrv32.scr
     
     Note: %SystemDrive% is a variable that refers to the drive on which Windows is installed. By default, this is drive C.
     
     
3. Adds the value:
   
   "Microsoft UpToDate Driver (32-bits)" = "[random file name].exe"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
   HKEY_CURRENT_USER\Software\Microsoft\OLE
   
   so that the worm is executed every time Windows starts.
   
   
4. Attempts to spread by exploiting the following vulnerabilities:
   
   
   • The Microsoft Windows DCOM RPC Interface Buffer Overrun Vulnerability (described in Microsoft Security Bulletin MS03-026).
   • The Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011).
   • The Workstation Service Buffer Overrun vulnerability (as described in Microsoft Security Bulletin MS03-049) using TCP port 445. Windows XP users are protected against this vulnerability if Microsoft Security Bulletin MS03-043 has been applied. Windows 2000 users must apply MS03-049.
     
     
5. Connects to an IRC server on the sirh0t.w00pie.nl domain, and waits for commands from the remote attacker. The attacker may be able to perform the following actions:
   
   
   • Start a denial of service attack
   • Start and end processes
   • Download and upload files
   • Update and uninstall the back door
     
     
6. Adds the values:
   
   "AutoShareServer" = "0"
   "AutoShareWks" = "0"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
   
   to enable it to spread and to enable its back door functionality.
   
   
7. Adds the value:
   
   "Start" = "4"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\wscsvc
   
   to enable it to spread and to enable its back door functionality.
   
   
8. Adds the values:
   
   "EnableDCOM" = "N"
   "EnableRemoteConnect" = "N"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
   
   to enable it to spread and to enable its back door functionality.
   
   
9. Adds the value:
   
   "Enabled" = "0"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server
   
   to enable it to spread and to enable its back door functionality.
   
   
10. Adds the value:
    
    "TransportBindName" = ""
    
    to the registry subkey:
    
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Parameters
    
    to enable it to spread and to enable its back door functionality.
    
    
11. Adds the value:
    
    "restrictanonymous" = "1"
    
    to the registry subkey:
    
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
    
    to enable it to spread and to enable its back door functionality.
    
    
12. Adds the values:
    
    "NameServer" = ""
    "ForwardBroadcasts" = "0"
    "IPEnableRouter" = "0"
    "Domain" = ""
    "SearchList" = ""
    "UseDomainNameDevolution" = "1"
    "EnableICMPRedirect" = "0"
    "DeadGWDetectDefault" = "1"
    "DontAddDefaultGatewayDefault" = "0"
    "EnableSecurityFilters" = "1"
    "AllowUnqualifiedQuery" = "0"
    "PrioritizeRecordData" = "1"
    "TCP1320Opts" = "3"
    "KeepAliveTime" = "0x00023280"
    "BcastQueryTimeout" = "0x000002ee"
    "BcastNameQueryCount" = "1"
    "CacheTimeout" = "0x0000ea60"
    "Size/Small/Medium/Large" = "3"
    "LargeBufferSize" = "0x00001000"
    "SynAckProtect" = "2"
    "PerformRouterDiscovery" = "0"
    "EnablePMTUBHDetect" = "0"
    "FastSendDatagramThreshold "="0x00000400"
    "StandardAddressLength "="0x00000018"
    "DefaultReceiveWindow "="0x00004000"
    "DefaultSendWindow" = "0x00004000"
    "BufferMultiplier" = "0x00000200"
    "PriorityBoost" = "2"
    "IrpStackSize" = "4"
    "IgnorePushBitOnReceives" = "0"
    "DisableAddressSharing" = "0"
    "AllowUserRawAccess" = "0"
    "DisableRawSecurity" = "0"
    "DynamicBacklogGrowthDelta" = "0x00000032"
    "FastCopyReceiveThreshold" = "0x00000400"
    "LargeBufferListDepth" = "0x0000000a"
    "MaxActiveTransmitFileCount" = "2"
    "MaxFastTransmit" = "0x00000040"
    "OverheadChargeGranularity" = "1"
    "SmallBufferListDepth" = "0x00000020"
    "SmallerBufferSize" = "0x00000080"
    "TransmitWorker" = "0x00000020"
    "DefaultRegistrationTTL" = "0x00000014"
    "DisableReplaceAddressesInConflicts" = "0"
    "DisableReverseAddressRegistrations" = "1"
    "UpdateSecurityLevel" = "0"
    "DisjointNameSpace" = "1"
    "QueryIpMatching" = "0"
    "NoNameReleaseOnDemand" = "1"
    "EnableDeadGWDetect" = "0"
    "EnableFastRouteLookup" = "1"
    "MaxFreeTcbs" = "0x000007d0"
    "MaxHashTableSize" = "0x00000800"
    "SackOpts" = "1"
    "Tcp1323Opts" = "3"
    "TcpMaxDupAcks" = "1"
    "TcpRecvSegmentSize" = "0x00000585"
    "TcpSendSegmentSize" = "0x00000585"
    "TcpWindowSize" = "0x0007d200"
    "DefaultTTL" = "0x00000030"
    "TcpMaxHalfOpen" = "0x0000004b"
    "TcpMaxHalfOpenRetried" = "0x00000050"
    "TcpTimedWaitDelay" = "0"
    "MaxNormLookupMemory" = "0x00030d40"
    "FFPControlFlags" = "1"
    "FFPFastForwardingCacheSize" = "0x00030d40"
    "MaxForwardBufferMemory" = "0x00019df7"
    "MaxFreeTWTcbs" = "0x000007d0"
    "GlobalMaxTcpWindowSize" = "0x0007d200"
    "EnablePMTUDiscovery" = "1"
    "ForwardBufferMemory" = "0x00019df7"
    "DNSQueryTimeouts" =
    "hex(7):31,00,00,00,32,00,00,00,32,00,00,00,34,00,00,00,38,00,00,00,30,00,00,00,00,00"
    
    to the registry subkey:
    
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    
    to enable it to spread and to enable its back door functionality.
    
    
13. Adds the values:
    
    "MaxConnectionsPer1_0Server" = "0x00000050"
    "MaxConnectionsPerServer" = "0x00000050"
    
    to the registry subkey:
    
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    
    to enable it to spread and to enable its back door functionality.

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.