W32.Secefa.A

1. It copies itself as the following files:
   
   
   • %Windir%\msdef.exe
   • %Windir%\services.exe
   • %System%\ws3lib.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).
   • %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. Creates the following additional files:
   
   
   • %Windir%\dodrrr.exe
   • %System%\qwe.bat
   • %System%\ftp.scr
     
     
3. Adds the value:
   
   "RPCser32g" = "services.exe"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
   RunServices
   
   so that it runs every time Windows starts.
   
   
4. Sets the value:
   
   "Start" = "4"
   
   in the registry subkey:
   
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SharedAccess
   
   in order to disable the Windows Firewall Service.
   
   
5. Sets the value:
   
   "EnableFirewall" = "0"
   
   in the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile
   HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\StandardProfile
   
   to disable the Windows Firewall.
   
   
6. Sets the value:
   
   "DisableRegistryTools" = "0"
   
   in the reigstry subkeys:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
   
   
7. Adds the value:
   
   "services.exe" = "services.exe:*:Enabled:services.exe"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\
   Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
   
   to add the worm as an authorized application.
   
   
8. Adds the values:
   
   "IEPgfsgdc" = "1"
   "wgwejjk" = "1"
   "Msrewfdarh" = "1"
   
   to the registry subkey:
   
   HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
   
   
9. Blocks access to several security-related Web sites by appending the following text to the hosts file:
   
   127.0.0.1 www.symantec.com
   127.0.0.1 securityresponse.symantec.com
   127.0.0.1 symantec.com
   127.0.0.1 www.sophos.com
   127.0.0.1 sophos.com
   127.0.0.1 www.mcafee.com
   127.0.0.1 mcafee.com
   127.0.0.1 liveupdate.symantecliveupdate.com
   127.0.0.1 www.viruslist.com
   127.0.0.1 viruslist.com
   127.0.0.1 viruslist.com
   127.0.0.1 f-secure.com
   127.0.0.1 www.f-secure.com
   127.0.0.1 kaspersky.com
   127.0.0.1 kaspersky-labs.com
   127.0.0.1 www.avp.com
   127.0.0.1 www.kaspersky.com
   127.0.0.1 avp.com
   127.0.0.1 www.networkassociates.com
   127.0.0.1 networkassociates.com
   127.0.0.1 www.ca.com
   127.0.0.1 ca.com
   127.0.0.1 mast.mcafee.com
   127.0.0.1 my-etrust.com
   127.0.0.1 www.my-etrust.com
   127.0.0.1 download.mcafee.com
   127.0.0.1 dispatch.mcafee.com
   127.0.0.1 secure.nai.com
   127.0.0.1 nai.com
   127.0.0.1 www.nai.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 liveupdate.symantec.com
   127.0.0.1 customer.symantec.com
   127.0.0.1 rads.mcafee.com
   127.0.0.1 trendmicro.com
   127.0.0.1 pandasoftware.com
   127.0.0.1 www.pandasoftware.com
   127.0.0.1 www.trendmicro.com
   127.0.0.1 www.grisoft.com
   127.0.0.1 www.microsoft.com
   127.0.0.1 microsoft.com
   127.0.0.1 www.virustotal.com
   127.0.0.1 virustotal.com
   127.0.0.1 www.amazon.com
   127.0.0.1 www.amazon.co.uk
   127.0.0.1 www.amazon.ca
   127.0.0.1 www.amazon.fr
   127.0.0.1 www.paypal.com
   127.0.0.1 paypal.com
   127.0.0.1 moneybookers.com
   127.0.0.1 www.moneybookers.com
   127.0.0.1 www.ebay.com
   127.0.0.1 ebay.com
   
   
10. Stops services with the following names:
    
    
    • AVPCC
    • AvxIni
    • BackWeb Client - 7681197
    • BlackICE
    • F-Secure Gatekeeper Handler Starter
    • FSMA
    • KAVMonitorService
    • McAfee Firewall
    • NISSERV
    • NISUM
    • NOD32ControlCenter
    • NOD32Service
    • NProtectService
    • NVCScheduler
    • NWService
    • Norman NJeeves
    • Norman ZANDA
    • Norton Antivirus Server
    • PASSRV
    • PCCPFW
    • PersFW
    • SWEEPSRV.SYS
    • SmcService
    • SweepNet
    • Tmntsrv
    • VexiraAntivirus
    • XCOMM
    • dvpapi
    • dvpinit
    • navapsvc
    • nvcoas
    • ravmon8
    • schscnt
    • vsmon
      
      
11. Attempts to end the following processes, some of which may be security-related:
    
    • ATUPDATER.EXE
    • AUPDATE.EXE
    • AUTODOWN.EXE
    • AUTOTRACE.EXE
    • AUTOUPDATE.EXE
    • AVPUPD.EXE
    • AVWUPD32.EXE
    • AVXQUAR.EXE
    • CFIAUDIT.EXE
    • DRWEBUPW.EXE
    • F-AGOBOT.EXE
    • GfxAcc.exe
    • HIJACKTHIS.EXE
    • IAOIN.EXE
    • ICSSUPPNT.EXE
    • ICSUPP95.EXE
    • LUALL.EXE
    • Lien Van de Kelderrr.exe
    • MCUPDATE.EXE
    • NUPGRADE.EXE
    • RAVMOND.exe
    • RB.EXE
    • Systra.exe
    • UPDATE.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
    • b055262c.dll
    • backdoor.rbot.gen.exe
    • backdoor.rbot.gen_(17).exe
    • dailin.exe
    • msnmsgr.exe
    • msssss.exe
    • rasmngr.exe
    • taskmanagr.exe
    • wfdmgr.exe
    • winshost.exe
    • wowpos32.exe
    • wuamga.exe
    • wuamgrd.exe
      
      
12. Creates a copy of the file %Windir%\sfc_os.dll (or sfc.dll on Windows 2000) as %Windir%\trash[RANDOM DIGITS].
    
    
13. Modifies the original %Windir%\sfc_os.dll or sfc.dll file and its backup in %Windir%\dllcache in order to disable System File Protection.
    
    
14. Opens a back door on the compromised computer by connecting to a predetermined IRC channel and listening for commands, which allow a remote attacker to perform various actions on the compromised computer.
    
    
15. Downloads a copy of another threat, Trojan.Gamqowi, over HTTP from one of the following servers:
    
    
    • bipla.com
    • podlz.com
    • pwoalz.com
    • 4phpscripts.com
    • enyka.com
      
      and saves it as %Windir%\mstempf.exe.
      
      
16. Spreads by exploiting the following vulnerabilities:
    
    • The Microsoft Windows Local Security Authority Service Remote Buffer Overflow vulnerability (as described in Microsoft Security Bulletin MS04-011).
    • Microsoft Windows Plug and Play Buffer Overflow Vulnerability (described in Microsoft Security Bulletin MS05-039) via TCP ports 139 and 445.

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.