W32.Secefa.B

Risk Level 2: Low

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Discovered: November 30, 2005

Updated: February 13, 2007 12:49:21 PM

Also Known As: W32/Ritdoor-D [Sophos], Win32.Qweasy.F [Computer Assoc

Type: Worm

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

When W32.Secefa.B is executed, it performs the following actions:

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.
Adds the value:

"RPCser32g" = "%Windir%\services.exe"

to the registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Runso that it runs every time Windows starts.
Adds the value:

"Msrewfdarh" = [HEX VALUES]

to the registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorerso that it runs every time Windows starts.

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.
Deletes the worm and the following registry subkeys, 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"
Attempts to end the following processes, and delete the executable file associated with the process:
- 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
Modifies the value:

"Start" = "4"

in the registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
to disable the Shared Access service.
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.
Adds the value:
"EnableFirewall" = "0"

to 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.
Adds the value:

"DisableRegistryTools" = "0"

to the registry subkeys:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies

in an attempt to enable the Registry Editor, but it is not effective due to a wrong registry name.
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 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
Downloads the file upx.exe from the following location, saves it as %Windir%\mstempf.exe, and executes it:
- [http://]sexgoogle.biz/[REMOVED]
- [http://]4phpscripts.com/[REMOVED]
- [http://]qooogle.com/[REMOVED]
  
  Note: At the time of writing, the files are copies of Trojan.Gamqowi. It attemps to download the file every 20 minutes.
Adds the value:

"jkdfeflk" = "1"

to the registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer

as an infection marker, if it successfully downloads and executes the above file.
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.
Opens an FTP server on a random TCP port between 10000 and 19999. A remote computer will download a copy of the worm from this FTP server.
Creates the following .bat file and FTP script file on the remote computer, in order to download a copy of the worm:
- %System%\qwe.bat
- %System%\qwe2.bat
- %System%\qwe3.bat
- %System%\qwe4.bat
- %System%\ft54.scr
- %System%ftp4.scr
- %System%\ftp3.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).
Uploads the worm as %System%\ws1lib.exe, %System%\ws2lib.exe or %System%\ws3lib.exe on the remote computer and executes it.
Spreads by exploiting the following vulnerabilities:
- Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011)
- Microsoft Windows Plug and Play Buffer Overflow Vulnerability (as described in Microsoft Security Bulletin MS05-039)
May stop the following services and delete the file associated with the services 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.

Writeup By: Masaki Suenaga

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