W32.Secefa.C

1. Copies itself as the following files:
   
   
   • %Windir%\services.exe
   • %Windir%\msdef.exe
     
     Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
     
     
2. Adds the value:
   
   "RPCser32g" = "%Windir%\services.exe"
   
   to the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
   
   so that it runs every time Windows starts.
   
   
3. Adds the value:
   
   "Msrewfdarh" = [HEX VALUES]
   
   to the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
   
   Note: [HEX VALUES] is 16 bytes long, and contains the year, month, day, hour, minute, second, millisecond, and day of the week that the user first executed the worm.
   
   
4. Deletes the following registry entries and itself, if the current date and time is after 00:05, September 15, 2007:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"RPCser32g"
   HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\"jkdfeflk"
   
   
5. Attempts to end the following processes, some of which are security-related, and deletes the executable file of the process found:
   
   
   • Lien Van de Kelderrr.exe
   • winshost.exe
   • msnmsgr.exe
   • wfdmgr.exe
   • IAOIN.EXE
   • RB.EXE
   • b055262c.dll
   • backdoor.rbot.gen.exe
   • backdoor.rbot.gen_(17).exe
   • msssss.exe
   • rasmngr.exe
   • dailin.exe
   • wowpos32.exe
   • wuamgrd.exe
   • taskmanagr.exe
   • wuamga.exe
   • ATUPDATER.EXE
   • AVWUPD32.EXE
   • AVPUPD.EXE
   • LUALL.EXE
   • DRWEBUPW.EXE
   • ICSSUPPNT.EXE
   • ICSUPP95.EXE
   • UPDATE.EXE
   • NUPGRADE.EXE
   • ATUPDATER.EXE
   • AUPDATE.EXE
   • AUTODOWN.EXE
   • AUTOTRACE.EXE
   • AUTOUPDATE.EXE
   • AVXQUAR.EXE
   • CFIAUDIT.EXE
   • MCUPDATE.EXE
   • NUPGRADE.EXE
   • Systra.exe
   • RAVMOND.exe
   • GfxAcc.exe
   • VisualGuard.exe
   • WIN-BUGSFIX.EXE
   • WIN32.EXE
   • WIN32US.EXE
   • WINACTIVE.EXE
   • WINDOW.EXE
   • WINDOWS.EXE
   • WININETD.EXE
   • WININIT.EXE
   • WININITX.EXE
   • WINLOGIN.EXE
   • WINMAIN.EXE
   • WINPPR32.EXE
   • WINRECON.EXE
   • WINSSK32.EXE
   • WINSTART.EXE
   • WINSTART001.EXE
   • WINTSK32.EXE
   • WINUPDATE.EXE
   • WKUFIND.EXE
   • WNAD.EXE
   • WNT.EXE
   • WRADMIN.EXE
   • WRCTRL.EXE
   • WUPDATER.EXE
   • WUPDT.EXE
   • WYVERNWORKSFIREWALL.EXE
   • XPF202EN.EXE
   • ZAPRO.EXE
   • ZAPSETUP3001.EXE
   • ZATUTOR.EXE
   • ZONALM2601.EXE
   • ZONEALARM.EXE
   • _AVP32.EXE
   • _AVPCC.EXE
   • _AVPM.EXE
   • HIJACKTHIS.EXE
   • F-AGOBOT.EXE
     
     
6. Modifies the value:
   
   "Start" = "4"
   
   in the registry subkey:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
   
   to disable shared access.
   
   
7. Adds the value:
   
   "%Windir%\services.exe" = "%Windir%\services.exe:*:Enabled:services.exe"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List\
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
   
   to add the worm as an authorized application.
   
   
8. Modifies the value:
   
   "EnableFirewall" = "0"
   
   in the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile
   
   to disable the Windows Firewall.
   
   
9. Adds or modifies the value:
   
   "DisableRegistryTools" = "0"
   
   in the registry subkeys:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies
   
   to enable registry editing.
   
   Note: Some malware may set the values to "1" to disable registry editing, or upon security policy these values may have been set to "1". The worm enables it.
   
   
10. Blocks access to several security-related Web sites by adding the following entries to the hosts file:
    
    127.0.0.1 avp.com
    127.0.0.1 ca.com
    127.0.0.1 customer.symantec.com
    127.0.0.1 dispatch.mcafee.com
    127.0.0.1 download.mcafee.com
    127.0.0.1 downloads-eu1.kaspersky-labs.com
    127.0.0.1 downloads-us1.kaspersky-labs.com
    127.0.0.1 downloads1.kaspersky-labs.com
    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 f-secure.com
    127.0.0.1 kaspersky-labs.com
    127.0.0.1 kaspersky.com
    127.0.0.1 liveupdate.symantec.com
    127.0.0.1 liveupdate.symantecliveupdate.com
    127.0.0.1 mast.mcafee.com
    127.0.0.1 mcafee.com
    127.0.0.1 microsoft.com
    127.0.0.1 my-etrust.com
    127.0.0.1 nai.com
    127.0.0.1 networkassociates.com
    127.0.0.1 oxyd.fr
    127.0.0.1 pandasoftware.com
    127.0.0.1 rads.mcafee.com
    127.0.0.1 secure.nai.com
    127.0.0.1 securityresponse.symantec.com
    127.0.0.1 sophos.com
    127.0.0.1 symantec.com
    127.0.0.1 t35.com
    127.0.0.1 t35.net
    127.0.0.1 trendmicro.com
    127.0.0.1 update.symantec.com
    127.0.0.1 updates.symantec.com
    127.0.0.1 us.mcafee.com
    127.0.0.1 viruslist.com
    127.0.0.1 virustotal.com
    127.0.0.1 www.avp.com
    127.0.0.1 www.ca.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.mcafee.com
    127.0.0.1 www.microsoft.com
    127.0.0.1 www.my-etrust.com
    127.0.0.1 www.nai.com
    127.0.0.1 www.networkassociates.com
    127.0.0.1 www.oxyd.fr
    127.0.0.1 www.pandasoftware.com
    127.0.0.1 www.sophos.com
    127.0.0.1 www.symantec.com
    127.0.0.1 www.t35.com
    127.0.0.1 www.t35.net
    127.0.0.1 www.trendmicro.com
    127.0.0.1 www.viruslist.com
    127.0.0.1 www.virustotal.com
    
    
11. Downloads the file up2.exe from the following locations, saves it as %Windir%\mstempf.exe and executes it:
    
    
    • [http://]pics-daily.com/[REMOVED]
    • [http://]sexgoogle.biz/[REMOVED]
    • [http://]super-babe.net/[REMOVED]
      
      Note: At the time of writing, the files are copies of Trojan.Gamqowi. It attemps to download the file every 20 minutes.
      
      
12. Adds the value:
    
    "jkdfeflk" = "1"
    
    to the registry subkey:
    
    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
    
    as an infection marker, if the worm successfully executes the downloaded file.
    
    
13. Adds the value:
    
    "IEPgfsgdc" = "1"
    
    to the registry subkey:
    
    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
    
    as an infection marker when it starts to spread.
    
    
14. Opens an FTP server on a random TCP port between 10000 and 19999. The FTP server is called from another computer to download a copy of the worm.
    
    
15. Creates one of the following BAT files and FTP script files to download a copy of the worm:
    
    BAT:
    
    
    • %System%\qwe1.bat
    • %System%\qwe2.bat
    • %System%\qwe3.bat
    • %System%\qwe4.bat
      
      
      FTP script:
      
      
    • %System%\ft54.scr
    • %System%\ft3.scr
    • %System%\ft4.scr
      
      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).
      
      
16. Downloads a copy of the worm using one of the following names and executes it:
    
    
    • %System%\ws1lib.exe
    • %System%\ws2lib.exe
    • %System%\ws3lib.exe
      
      
17. Spreads by exploiting the following remote vulnerabilities:
    
    The Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011).
    The Microsoft Windows Plug and Play Buffer Overflow Vulnerability (as described in Microsoft Security Bulletin MS05-039) via TCP ports 139 and 445.
    
    
18. May stop and delete the following services and delete the file associated with the service found:
    
    
    • NETSKY
    • navapsvc
    • NProtectService
    • Norton Antivirus Server
    • VexiraAntivirus
    • dvpinit
    • dvpapi
    • schscnt
    • BackWeb Client - 7681197
    • F-Secure Gatekeeper Handler Starter
    • FSMA
    • AVPCC
    • KAVMonitorService
    • Norman NJeeves
    • NVCScheduler
    • nvcoas
    • Norman ZANDA
    • PASSRV
    • SweepNet
    • SWEEPSRV.SYS
    • NOD32ControlCenter
    • NOD32Service
    • PCCPFW
    • Tmntsrv
    • AvxIni
    • XCOMM
    • ravmon8
    • SmcService
    • BlackICE
    • PersFW
    • McAfee Firewall
    • NWService
    • NISUM
    • NISSERV
    • vsmon

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.