Trojan.Tooso.N

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Discovered: September 12, 2005
Updated: February 13, 2007 12:44:15 PM
Also Known As: Troj/Dropper-{BB, BC, BD} [Sophos]
Type: Trojan Horse
Systems Affected: Windows



Trojan.Tooso.N is a Trojan Horse that attempts to lower security settings and download other threats. This risk is mailed by W32.Beagle.CG@mm .

Antivirus Protection Dates

  • Initial Rapid Release version September 12, 2005
  • Latest Rapid Release version March 23, 2017 revision 037
  • Initial Daily Certified version September 12, 2005
  • Latest Daily Certified version March 23, 2017 revision 041
  • Initial Weekly Certified release date September 14, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Rodney Andres

Discovered: September 12, 2005
Updated: February 13, 2007 12:44:15 PM
Also Known As: Troj/Dropper-{BB, BC, BD} [Sophos]
Type: Trojan Horse
Systems Affected: Windows


When Trojan.Tooso.N is executed, it performs the following actions:

  1. Creates the following file:

    %Windir%\gfgdgfddfgdfgwe.exe

    Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  2. Attempts to execute this file, which only runs under Windows 95/98/Me.

    Note: If the compromised computer is not running Windows 95/98/Me, the Trojan will not execute.

  3. Copies itself as %System%\winshost.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).

  4. Drops the following file:

    %System%\wiwshost.exe

  5. Adds the value:

    "winshost.exe" = "%System%\winshost.exe"

    to the registry entries:

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

    so that it runs every time Windows starts.

  6. Attempts to find the explorer.exe process and injects wiwshost.exe into it.

    Note: All subsequent actions are taken by wiwshost.exe, but will appear to be taken by explorer.exe.

  7. Overwrites the compromised computer's hosts file with the following text:

    127.0.0.1 localhost

  8. Launches a thread that stops services with the following names:

    • Ahnlab task Scheduler
    • alerter
    • AlertManger
    • AVExch32Service
    • avg7alrt
    • avg7updsvc
    • AvgCore
    • AvgFsh
    • AvgServ
    • avpcc
    • AVPCC
    • AVUPDService
    • AvxIni
    • awhost32
    • backweb client - 4476822
    • BackWeb Client - 7681197
    • backweb client-4476822
    • BlackICE
    • CAISafe
    • ccEvtMgr
    • ccEvtMgr
    • ccPwdSvc
    • ccSetMgr
    • ccSetMgr.exe
    • DefWatch
    • dvpapi
    • dvpinit
    • fsbwsys
    • fsdfwd
    • FSDFWD
    • F-Secure Gatekeeper Handler Starter
    • F-Secure Gatekeeper Handler Starter
    • FSMA
    • FSMA
    • KAVMonitorService
    • KAVMonitorService
    • kavsvc
    • KLBLMain
    • McAfee Firewall
    • McAfeeFramework
    • McShield
    • McTaskManager
    • mcupdmgr.exe
    • MCVSRte
    • MonSvcNT
    • navapsvc
    • navapsvc
    • navapsvc
    • navapsvc
    • Network Associates Log Service
    • NISSERV
    • NISUM
    • NOD32ControlCenter
    • NOD32Service
    • Norman NJeeves
    • Norman ZANDA
    • Norton Antivirus Server
    • NPFMntor
    • NProtectService
    • NSCTOP
    • nvcoas
    • NVCScheduler
    • nwclntc
    • nwclntd
    • nwclnte
    • nwclntf
    • nwclntg
    • nwclnth
    • NWService
    • Outbreak Manager
    • Outpost Firewall
    • OutpostFirewall
    • PASSRV
    • PAVFNSVR
    • Pavkre
    • PavProt
    • PavPrSrv
    • PAVSRV
    • PCCPFW
    • PersFW
    • PREVSRV
    • PSIMSVC
    • ravmon8
    • SAVFMSE
    • SAVScan
    • SAVScan
    • SAVScan
    • SBService
    • schscnt
    • SharedAccess
    • sharedaccess
    • SharedAccess
    • SmcService
    • SNDSrvc
    • SPBBCSvc
    • SweepNet
    • SWEEPSRV.SYS
    • Symantec AntiVirus Client
    • Symantec Core LC
    • Symantec Core LC
    • Symantec Core LC
    • Tmntsrv
    • V3MonNT
    • V3MonSvc
    • VexiraAntivirus
    • VisNetic AntiVirus Plug-in
    • vsmon
    • vsmon
    • wscsvc
    • wuauserv
    • wuauserv
    • XCOMM

  9. Attempts to delete the following registry entries:

    "Symantec NetDriver Monitor"
    "ccApp"
    "NAV CfgWiz"
    "SSC_UserPrompt"
    "McAfee Guardian"
    "APVXDWIN"
    "KAV50"
    "avg7_cc"
    "avg7_emc"
    "Zone Labs Client"

    from the following subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  10. Attempts to delete the following registry entry:

    "McAfee.InstantUpdate.Monitor"

    from the following subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

  11. Attempts to delete the following registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Symantec
    HKEY_LOCAL_MACHINE\SOFTWARE\McAfee
    HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab
    HKEY_LOCAL_MACHINE\SOFTWARE\Agnitum
    HKEY_LOCAL_MACHINE\SOFTWARE\Panda Software
    HKEY_LOCAL_MACHINE\SOFTWARE\Zone Labs

  12. Attempts to rename all instances of the following files on all fixed drives:

    Renamed from:

    • av.dll to a5v.dll
    • AUPDATE.EXE to AUPD1ATE.EXE
    • Avsynmgr.exe to Av1synmgr.exe
    • Avconsol.exe to Avc1onsol.exe
    • avgemc.exe to avg23emc.exe
    • avgcc.exe to avgc3c.exe
    • CCSETMGR.EXE to C1CSETMGR.EXE
    • cafix.exe to c6a5fix.exe
    • CCEVTMGR.EXE to CC1EVTMGR.EXE
    • ccl30.dll to cc1l30.dll
    • ccApp.exe to ccA1pp.exe
    • ccvrtrst.dll to ccv1rtrst.dll
    • CMGrdian.exe to CM1Grdian.exe
    • isafe.exe to is5a6fe.exe
    • KAV.exe to K2A2V.exe
    • kavmm.exe to kav12mm.exe
    • LUALL.EXE to LUAL1L.EXE
    • LUINSDLL.DLL to LUI1NSDLL.DLL
    • Luupdate.exe to Luup1date.exe
    • Mcshield.exe to Mcsh1ield.exe
    • NAVAPSVC.EXE to NAV1APSVC.EXE
    • NPFMNTOR.EXE to NPFM1NTOR.EXE
    • outpost.exe to outp1ost.exe
    • RuLaunch.exe to RuLa1unch.exe
    • symlcsvc.exe to s1ymlcsvc.exe
    • SNDSrvc.exe to SND1Srvc.exe
    • SPBBCSvc.exe to SP1BBCSvc.exe
    • Up2Date.exe to Up222Date.exe
    • vetredir.dll to ve6tre5dir.dll
    • VsStat.exe to Vs1Stat.exe
    • vsvault.dll to vs6va5ult.dll
    • Vshwin32.exe to Vshw1in32.exe
    • zatutor.exe to zatu6tor.exe
    • zlavscan.dll to zl5avscan.dll
    • zlclient.exe to zlcli6ent.exe
    • zonealarm.exe to zo3nealarm.exe

  13. Attempts to terminate processes with the following names:

    • ATUPDATER.EXE
    • ATUPDATER.EXE
    • AUPDATE.EXE
    • AUTODOWN.EXE
    • AUTOTRACE.EXE
    • AUTOUPDATE.EXE
    • AVPUPD.EXE
    • AVWUPD32.EXE
    • AVXQUAR.EXE
    • AVXQUAR.EXE
    • CFIAUDIT.EXE
    • DRWEBUPW.EXE
    • ESCANH95.EXE
    • ESCANHNT.EXE
    • FIREWALL.EXE
    • ICSSUPPNT.EXE
    • ICSUPP95.EXE
    • LUALL.EXE
    • MCUPDATE.EXE
    • NUPGRADE.EXE
    • NUPGRADE.EXE
    • OUTPOST.EXE
    • UPDATE.EXE
    • UPGRADER.EXE

  14. Attempts to download files from the following URLs in the sequence given:

    • [http://]www.yannick-spruyt.be/[REMOVED]/osa5.gif
    • [http://]www.yayadownload.com/ [REMOVED]/osa5.gif
    • [http://]www.yesterdays.co.za/ [REMOVED]/osa5.gif
    • [http://]www.yesterdays.co.za/ [REMOVED]/osa5.gif
    • [http://]www.yshkj.com/[REMOVED]/osa5.gif
    • [http://]www.yshkj.com/[REMOVED]/osa5.gif
    • [http://]www.zakazcd.dp.ua/[REMOVED]/osa5.gif
    • [http://]www.students.stir.ac.uk/[REMOVED]/osa5.gif
    • [http://]www.zenesoftware.com/[REMOVED]/osa5.gif
    • [http://]www.zentek.co.za/[REMOVED]/osa5.gif
    • [http://]www.czzm.com/[REMOVED]/osa5.gif
    • [http://]www.izoli.sk/[REMOVED]/osa5.gif
    • [http://]www.zorbas.az/[REMOVED]/osa5.gif
    • [http://]www.zsbersala.edu.sk/[REMOVED]/osa5.gif
    • [http://]www.triptonic.ch/[REMOVED]/osa5.gif
    • [http://]www.tv-marina.com/[REMOVED]/osa5.gif
    • [http://]www.travelourway.com/[REMOVED]/osa5.gif
    • [http://]www.megaserve.net/[REMOVED]/osa5.gif
    • [http://]www.trgd.dobrcz.pl/[REMOVED]/osa5.gif
    • [http://]www.mild.at/[REMOVED]/osa5.gif
    • [http://]www.mild.at/[REMOVED]/osa5.gif
    • [http://]www.kingsley.ch/[REMOVED]/osa5.gif
    • [http://]www.mild.at/[REMOVED]/osa5.gif
    • [http://]www.elvis-presley.ch/[REMOVED]/osa5.gif
    • [http://]www.gomyhome.com.tw/[REMOVED]/osa5.gif
    • [http://]www.ider.cl/[REMOVED]/osa5.gif
    • [http://]www.ascolfibras.com/[REMOVED]/osa5.gif
    • [http://]www.on24.ee/[REMOVED]/osa5.gif
    • [http://]www.xojc.com/[REMOVED]/osa5.gif
    • [http://]www.x-treme.cz/[REMOVED]/osa5.gif
    • [http://]www.gymzn.cz/[REMOVED]/osa5.gif
    • [http://]www.gymzn.cz/[REMOVED]/osa5.gif
    • [http://]www.gymzn.cz/[REMOVED]/osa5.gif
    • [http://]www.xiantong.net/[REMOVED]/osa5.gif
    • [http://]www.xmpie.com/[REMOVED]/osa5.gif
    • [http://]www.xmpie.com/[REMOVED]/osa5.gif
    • [http://]www.xmtd.com/[REMOVED]/osa5.gif
    • [http://]www.onlink.net/[REMOVED]/osa5.gif
    • [http://]www.discoteka-funfactory.com/[REMOVED]/osa5.gif
    • [http://]www.toussain.be/[REMOVED]/osa5.gif
    • [http://]www.idcs.be/[REMOVED]/osa5.gif
    • [http://]www.gepeters.org/[REMOVED]/osa5.gif
    • [http://]www.angham.de/[REMOVED]/osa5.gif
    • [http://]www.idaf.de/[REMOVED]/osa5.gif
    • [http://]www.bolz.at/[REMOVED]/osa5.gif
    • [http://]www.societaet.de/[REMOVED]/osa5.gif
    • [http://]www.ppm-alliance.de/[REMOVED]/osa5.gif
    • [http://]www.udc-cassinadepecchi.it/[REMOVED]/osa5.gif
    • [http://]www.universe.sk/[REMOVED]/osa5.gif
    • [http://]www.jingjuok.com/[REMOVED]/osa5.gif
    • [http://]www.gemtrox.com.tw/[REMOVED]/osa5.gif
    • [http://]www.uspowerchair.com/[REMOVED]/osa5.gif
    • [http://]www.steripharm.com/[REMOVED]/osa5.gif
    • [http://]www.beall-cpa.com/[REMOVED]/osa5.gif
    • [http://]www.jcm-american.com/[REMOVED]/osa5.gif
    • [http://]www.vercruyssenelektro.be/[REMOVED]/osa5.gif
    • [http://]www.centrovestecasa.it/[REMOVED]/osa5.gif
    • [http://]www.vet24h.com/[REMOVED]/osa5.gif
    • [http://]www.vinimeloni.com/[REMOVED]/osa5.gif
    • [http://]www.vnrvjiet.ac.in/[REMOVED]/osa5.gif
    • [http://]www.vote2fateh.com/[REMOVED]/osa5.gif
    • [http://]www.marketvw.com/[REMOVED]/osa5.gif
    • [http://]www.formholz.at/[REMOVED]/osa5.gif
    • [http://]www.checkonemedia.nl/[REMOVED]/osa5.gif
    • [http://]www.fotomax.fi/[REMOVED]/osa5.gif
    • [http://]www.vw.press-bank.pl/[REMOVED]/osa5.gif
    • [http://]www.wamba.asn.au/[REMOVED]/osa5.gif
    • [http://]www.cz-wanjia.com/[REMOVED]/osa5.gif
    • [http://]www.czwanqing.com/[REMOVED]/osa5.gif
    • [http://]www.wdlp.co.za/[REMOVED]/osa5.gif
    • [http://]www.automobilonline.de/[REMOVED]/osa5.gif
    • [http://]www.bangyan.cn/[REMOVED]/osa5.gif
    • [http://]www.21ebuild.com/[REMOVED]/osa5.gif
    • [http://]www.eagle.com.cn/[REMOVED]/osa5.gif
    • [http://]www.eagleclub.com.cn/[REMOVED]/osa5.gif
    • [http://]www.eagleclub.com.cn/[REMOVED]/osa5.gif
    • [http://]www.sanjinyuan.com/[REMOVED]/osa5.gif
    • [http://]www.designgong.org/[REMOVED]/osa5.gif
    • [http://]www.fermegaroy.com/[REMOVED]/osa5.gif
    • [http://]www.welchcorp.com/[REMOVED]/osa5.gif
    • [http://]www.snsphoto.com/[REMOVED]/osa5.gif
    • [http://]www.soeco.org/[REMOVED]/osa5.gif
    • [http://]www.softmajor.ru/[REMOVED]/osa5.gif
    • [http://]www.solt3.org/[REMOVED]/osa5.gif
    • [http://]www.sqnsolutions.com/[REMOVED]/osa5.gif
    • [http://]www.spacium.biz/[REMOVED]/osa5.gif
    • [http://]www.speedcom.home.pl/[REMOVED]/osa5.gif
    • [http://]www.trago.com.pt/[REMOVED]/osa5.gif
    • [http://]www.spirit-in-steel.at/[REMOVED]/osa5.gif
    • [http://]www.spy.az/[REMOVED]/osa5.gif
    • [http://]www.st-paulus-bonn.dehtdocs/[REMOVED]/osa5.gif
    • [http://]www.stbs.com.hk/[REMOVED]/osa5.gif
    • [http://]www.acsohio.com/[REMOVED]/osa5.gif
    • [http://]www.olva.com.pe/[REMOVED]/osa5.gif
    • [http://]www.subsplanet.com/[REMOVED]/osa5.gif
    • [http://]www.sungodbio.com/[REMOVED]/osa5.gif
    • [http://]www.superbetcs.com/[REMOVED]/osa5.gif
    • [http://]www.vnn.vn/[REMOVED]/osa5.gif
    • [http://]www.sydolo.com/[REMOVED]/osa5.gif
    • [http://]www.szdiheng.com/[REMOVED]/osa5.gif
    • [http://]www.agria.hu/[REMOVED]/osa5.gif
    • [http://]www.externet.hu/[REMOVED]/osa5.gif
    • [http://]www.hondenservice.be/[REMOVED]/osa5.gif
    • [http://]www.ehc.hu/[REMOVED]/osa5.gif
    • [http://]www.tcicampus.net/[REMOVED]/osa5.gif
    • [http://]www.contentproject.com/[REMOVED]/osa5.gif
    • [http://]www.festivalteatrooccidente.com/[REMOVED]/osa5.gif
    • [http://]www.techni.com.cn/[REMOVED]/osa5.gif
    • [http://]www.festivalteatrooccidente.com/[REMOVED]/osa5.gif
    • [http://]www.thaifast.com/[REMOVED]/osa5.gif
    • [http://]www.thaiventure.com/[REMOVED]/osa5.gif
    • [http://]www.andi.com.vn/[REMOVED]/osa5.gif
    • [http://]www.replayu.com/[REMOVED]/osa5.gif
    • [http://]www.th-mutan.com/[REMOVED]/osa5.gif
    • [http://]www.thetexasoutfitter.com/[REMOVED]/osa5.gif
    • [http://]www.tmhcsd1987.friko.pl/[REMOVED]/osa5.gif
    • [http://]www.thenextstep.tv/[REMOVED]/osa5.gif
    • [http://]www.thenextstep.tv/[REMOVED]/osa5.gif
    • [http://]www.wesartproductions.com/[REMOVED]/osa5.gif
    • [http://]www.wilsonscountry.com/[REMOVED]/osa5.gif
    • [http://]www.windstar.pl/[REMOVED]/osa5.gif
    • [http://]www.wise-industries.com/[REMOVED]/osa5.gif
    • [http://]www.witold.pl/[REMOVED]/osa5.gif
    • [http://]www.witold.pl/[REMOVED]/osa5.gif
    • [http://]www.51.net/[REMOVED]/osa5.gif
    • [http://]www.slovanet.sk/[REMOVED]/osa5.gif
    • [http://]www.wombband.com/[REMOVED]/osa5.gif
    • [http://]www.datanet.huwww.datanet.hu/[REMOVED]/osa5.gif
    • [http://]www.uw.hu/[REMOVED]/osa5.gif
    • [http://]www.dgy.com.cn/[REMOVED]/osa5.gif
    • [http://]www.bs-security.de/[REMOVED]/osa5.gif
    • [http://]www.die-fliesen.de/[REMOVED]/osa5.gif
    • [http://]www.dom-invest.com.pl/[REMOVED]/osa5.gif
    • [http://]www.engelhardtgmbh.de/[REMOVED]/osa5.gif
    • [http://]www.triapex.cz/[REMOVED]/osa5.gif
    • [http://]www.fahrschule-herb.de/[REMOVED]/osa5.gif
    • [http://]www.fahrschule-lesser.de/[REMOVED]/osa5.gif
    • [http://]www.gimex-messzeuge.de/[REMOVED]/osa5.gif
    • [http://]www.inside-tgweb.de/[REMOVED]/osa5.gif
    • [http://]www.jue-bo.com/[REMOVED]/osa5.gif
    • [http://]www.niko.de/[REMOVED]/osa5.gif
    • [http://]www.nikogmbh.com/[REMOVED]/osa5.gif
    • [http://]www.renegaderc.com/[REMOVED]/osa5.gif
    • [http://]www.sachsenbuecher.de/[REMOVED]/osa5.gif
    • [http://]www.scvanravenswaaij.nl/[REMOVED]/osa5.gif
    • [http://]www.spoden.de/[REMOVED]/osa5.gif
    • [http://]www.sportnf.com/[REMOVED]/osa5.gif
    • [http://]www.sweb.cz/[REMOVED]/osa5.gif
    • [http://]www.tg-sandhausen-basketball.de/[REMOVED]/osa5.gif
    • [http://]www.thefunkiest.com/[REMOVED]/osa5.gif
    • [http://]www.thefunkiest.com/[REMOVED]/osa5.gif
    • [http://]www.jeoushinn.com/[REMOVED]/osa5.gif
    • [http://]www.presley.ch/[REMOVED]/osa5.gif

      Note: At the time of writing, the files were not available.

  15. Attempts to save the downloaded file as %Windir%\_re_file.exe and then executed it.

    Note: It has been reported that the downloaded file may be a Beagle variant.

  16. Creates the following registry subkey:

    HKEY_CURRENT_USER\Software\FirstRun\FirstRunRR

    which is used as an infection marker.

  17. Opens notepad.exe.

    Note: This only occurs after the first time the Trojan is launched.


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: Rodney Andres

Discovered: September 12, 2005
Updated: February 13, 2007 12:44:15 PM
Also Known As: Troj/Dropper-{BB, BC, BD} [Sophos]
Type: Trojan Horse
Systems Affected: Windows


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Run a full system scan and delete all the files detected.
  4. Restore the renamed files.
For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to Virus Definitions (Intelligent Updater).

    The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.


3. To scan for and delete the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected, click Delete.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.


4. To Restore the renamed files
Using Windows Explorer, locate the following files and rename them or re-install the programs to which they belong.

Rename from:

    • a5v.dll to av.dll
    • AUPD1ATE.EXE to AUPDATE.EXE
    • Av1synmgr.exe to Avsynmgr.exe
    • Avc1onsol.exe to Avconsol.exe
    • avg23emc.exe to avgemc.exe
    • avgc3c.exe to avgcc.exe
    • C1CSETMGR.EXE to CCSETMGR.EXE
    • c6a5fix.exe to cafix.exe
    • CC1EVTMGR.EXE to CCEVTMGR.EXE
    • cc1l30.dll to ccl30.dll
    • ccA1pp.exe to ccApp.exe
    • ccv1rtrst.dll to ccvrtrst.dll
    • CM1Grdian.exe to CMGrdian.exe
    • is5a6fe.exe to isafe.exe
    • K2A2V.exe to KAV.exe
    • kav12mm.exe to kavmm.exe
    • LUAL1L.EXE to LUALL.EXE
    • LUI1NSDLL.DLL to LUINSDLL.DLL
    • Luup1date.exe to Luupdate.exe
    • Mcsh1ield.exe to Mcshield.exe
    • NAV1APSVC.EXE to NAVAPSVC.EXE
    • NPFM1NTOR.EXE to NPFMNTOR.EXE
    • outp1ost.exe to outpost.exe
    • RuLa1unch.exe to RuLaunch.exe
    • s1ymlcsvc.exe to symlcsvc.exe
    • SND1Srvc.exe to SNDSrvc.exe
    • SP1BBCSvc.exe to SPBBCSvc.exe
    • Up222Date.exe to Up2Date.exe
    • ve6tre5dir.dll to vetredir.dll
    • Vs1Stat.exe to VsStat.exe
    • vs6va5ult.dll to vsvault.dll
    • Vshw1in32.exe to Vshwin32.exe
    • zatu6tor.exe to zatutor.exe
    • zl5avscan.dll to zlavscan.dll
    • zlcli6ent.exe to zlclient.exe
    • zo3nealarm.exe to zonealarm.exe


Writeup By: Rodney Andres