Trojan.Lodav.C

SUMMARY

Trojan.Lodav.C is a Trojan horse that attempts to lower security settings on the compromised computer. This Trojan may be downloaded by Trojan.Lodear.D.

Protection

• Virus Definitions (LiveUpdate™ Weekly) November 30, 2005
• Virus Definitions (Intelligent Updater) November 28, 2005

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Low
• Payload: Lowers security settings
• Compromises Security Settings: Blocks access to Web sites and deletes processes, some of which are security related.

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

When Trojan.Lodav.C is executed, it performs the following actions:

1. Copies itself as %System%winlog.exe.
   
   Note: %System% is a variable that refers to the System folder. By default this is C:WindowsSystem (Windows 95/98/Me), C:WinntSystem32 (Windows NT/2000), or C:WindowsSystem32 (Windows XP).
   
   
2. Creates the following file:
   
   %System%winlog.dll
   
   
3. Adds the value:
   
   "key2" = "%System%winlog.exe"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun
   
   so that it runs every time Windows starts.
   
   
4. Deletes the following security-related registry subkeys:
   
   HKEY_LOCAL_MACHINESOFTWARESymantec
   HKEY_LOCAL_MACHINESOFTWAREMcAfee
   HKEY_LOCAL_MACHINESOFTWAREKasperskyLab
   HKEY_LOCAL_MACHINESOFTWAREAgnitum
   HKEY_LOCAL_MACHINESOFTWAREPanda Software
   HKEY_LOCAL_MACHINESOFTWAREone Labs
   HKEY_LOCAL_MACHINESOFTWARETrend Micro
   
   
5. Deletes the following security-related registry entries:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"Symantec NetDriver Monitor"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"ccApp"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"NAV CfgWiz"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"SSC_UserPrompt"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"McAfee Guardian"
   HKEY_CURRENT_USERSOFTWAREMicrosoftWindowsCurrentVersionRun"McAfee.InstantUpdate.Monitor"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"APVXDWIN"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"KAV50"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"avg7_cc"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"avg7_emc"
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun"Zone Labs Client"
   
   
6. Ends the following processes, most of which are security related:
   
   
   • ashAvast.exe
   • ashDisp.exe
   • ashEnhcd.exe
   • ashPopWz.exe
   • ashSimpl.exe
   • ashSkPck.exe
   • ashWebSv.exe
   • AUPDATE.EXE
   • Avconsol.exe
   • avgcc.exe
   • avgemc.exe
   • AVGNT.EXE
   • AVSCHED32.EXE
   • Avsynmgr.exe
   • AVWUPD32.EXE
   • bdmcon.exe
   • bdnews.exe
   • bdsubmit.exe
   • bdswitch.exe
   • cafix.exe
   • ccApp.exe
   • CCEVTMGR.EXE
   • CCSETMGR.EXE
   • ClamTray.exe
   • ClamWin.exe
   • CMGrdian.exe
   • drwadins.exe
   • drweb32w.exe
   • drwebscd.exe
   • drwebupw.exe
   • freshclam.exe
   • GUARDGUI.EXE
   • GuardNT.exe
   • INETUPD.EXE
   • InocIT.exe
   • InoUpTNG.exe
   • isafe.exe
   • KAV.exe
   • kavmm.exe
   • KAVPF.exe
   • LUALL.EXE
   • Luupdate.exe
   • Mcshield.exe
   • NAVAPSVC.EXE
   • nod32.exe
   • nod32kui.exe
   • NPFMNTOR.EXE
   • npfmsg.exe
   • Nvcod.exe
   • Nvcte.exe
   • Nvcut.exe
   • outpost.exe
   • pccguide.exe
   • PcCtlCom.exe
   • QHPF.EXE
   • Realmon.exe
   • regedit.exe
   • regedt32.exe
   • RuLaunch.exe
   • SNDSrvc.exe
   • SPBBCSvc.exe
   • spiderml.exe
   • symlcsvc.exe
   • Tmntsrv.exe
   • TmPfw.exe
   • tmproxy.exe
   • Up2Date.exe
   • upgrepl.exe
   • Vba32ECM.exe
   • Vba32ifs.exe
   • vba32ldr.exe
   • Vba32PP3.exe
   • Vshwin32.exe
   • VsStat.exe
   • zatutor.exe
   • zlclient.exe
   • taskmgr.exe
   • zonealarm.exe
   • advapi32.dll
   • OpenSCManagerA
   • OpenServiceA
   • ControlService
   • ChangeServiceConfigA
   • CloseServiceHandle
   • ashAvast.exe
   • ashDisp.exe
   • ashEnhcd.exe
   • ashPopWz.exe
   • ashShA64.dll
   • ashSimpl.exe
   • ashSkPck.exe
   • ashWebSv.exe
   • AUPDATE.EXE
   • Avconsol.exe
   • avgcc.exe
   • AVGCMSG.DLL
   • avgemc.exe
   • AVGNT.EXE
   • AVSCHED32.DLL
   • AVSCHED32.EXE
   • Avsynmgr.exe
   • AVWUPD32.EXE
   • BCGCB59.dll
   • bdmcon.exe
   • bdnews.exe
   • bdsubmit.exe
   • bdswitch.exe
   • cafix.exe
   • ccApp.exe
   • CCEVTMGR.EXE
   • ccl30.dll
   • CCSETMGR.EXE
   • ccvrtrst.dll
   • ClamTray.exe
   • ClamWin.exe
   • CMGrdian.exe
   • D2htls32.dll
   • drwadins.exe
   • drweb32w.exe
   • drwebscd.exe
   • drwebupw.exe
   • FFJMPWEB.DLL
   • freshclam.exe
   • GUARDEVT.DLL
   • GUARDGUI.EXE
   • GUARDMSG.DLL
   • GuardNT.exe
   • IksysT32.dll
   • INETUPD.EXE
   • InocIT.exe
   • InoOEM.dll
   • InoOption.dll
   • InoUpTNG.exe
   • isafe.exe
   • KAV.exe
   • kavmm.exe
   • KAVPF.exe
   • LUALL.EXE
   • LUINSDLL.DLL
   • Luupdate.exe
   • Mcshield.exe
   • NAVAPSVC.EXE
   • nod32.exe
   • nod32api.dll
   • nod32kui.exe
   • NPFMNTOR.EXE
   • npfmsg.exe
   • Nvccf0D.dll
   • Nvcevlog.dll
   • Nvcod.exe
   • Nvcte.exe
   • Nvcut.exe
   • OCONNDLG.DLL
   • OCOOKDLG.DLL
   • outpost.exe
   • pccguide.exe
   • PcCtlCom.exe
   • python23.dll
   • QHPF.EXE
   • Realmon.exe
   • RuLaunch.exe
   • schface.dll
   • SNDSrvc.exe
   • SPBBCSvc.exe
   • spiderml.exe
   • symlcsvc.exe
   • T2w32.dll
   • Tmntsrv.exe
   • TmPfw.exe
   • tmproxy.exe
   • Up2Date.exe
   • upgrepl.exe
   • Vba32ifs.exe
   • vba32ldr.exe
   • Vba32PP3.exe
   • vbaifps.dll
   • vetredir.dll
   • Vshwin32.exe
   • VsStat.exe
   • vsvault.dll
   • XT1922.dll
   • Vba32ECM.exe
   • zatutor.exe
   • zlavscan.dll
   • zlclient.exe
   • zonealarm.exe
     
     
7. Attempts to rename the following files, most of which are security related:
   
   
   • ashAvast.exe - 1ashAvast.exe
   • ashDisp.exe - 1ashDisp.exe
   • ashEnhcd.exe - 1ashEnhcd.exe
   • ashPopWz.exe - 1ashPopWz.exe
   • ashShA64.dll - 1ashShA64.dll
   • ashSimpl.exe - 1ashSimpl.exe
   • ashSkPck.exe - 1ashSkPck.exe
   • ashWebSv.exe - 1ashWebSv.exe
   • AUPDATE.EXE - 1AUPDATE.EXE
   • Avconsol.exe - 1Avconsol.exe
   • avgcc.exe - 1avgcc.exe
   • AVGCMSG.DLL - 1AVGCMSG.DLL
   • avgemc.exe - 1avgemc.exe
   • AVGNT.EXE - 1AVGNT.EXE
   • AVSCHED32.DLL - 1AVSCHED32.DLL
   • AVSCHED32.EXE - 1AVSCHED32.EXE
   • Avsynmgr.exe - 1Avsynmgr.exe
   • AVWUPD32.EXE - 1AVWUPD32.EXE
   • BCGCB59.dll - 1BCGCB59.dll
   • bdmcon.exe - 1bdmcon.exe
   • bdnews.exe - 1bdnews.exe
   • bdsubmit.exe - 1bdsubmit.exe
   • bdswitch.exe - 1bdswitch.exe
   • cafix.exe - 1cafix.exe
   • ccApp.exe - 1ccApp.exe
   • CCEVTMGR.EXE - 1CCEVTMGR.EXE
   • ccl30.dll - 1ccl30.dll
   • CCSETMGR.EXE - 1CCSETMGR.EXE
   • ccvrtrst.dll - 1ccvrtrst.dll
   • ClamTray.exe - 1ClamTray.exe
   • ClamWin.exe - 1ClamWin.exe
   • CMGrdian.exe - 1CMGrdian.exe
   • D2htls32.dll - 1D2htls32.dll
   • drwadins.exe - 1drwadins.exe
   • drweb32w.exe - 1drweb32w.exe
   • drwebscd.exe - 1drwebscd.exe
   • drwebupw.exe - 1drwebupw.exe
   • FFJMPWEB.DLL - 1FFJMPWEB.DLL
   • freshclam.exe - 1freshclam.exe
   • GUARDEVT.DLL - 1GUARDEVT.DLL
   • GUARDGUI.EXE - 1GUARDGUI.EXE
   • GUARDMSG.DLL - 1GUARDMSG.DLL
   • GuardNT.exe - 1GuardNT.exe
   • IksysT32.dll - 1IksysT32.dll
   • INETUPD.EXE - 1INETUPD.EXE
   • InocIT.exe - 1InocIT.exe
   • InoOEM.dll - 1InoOEM.dll
   • InoOption.dll - 1InoOption.dll
   • InoUpTNG.exe - 1InoUpTNG.exe
   • isafe.exe - 1isafe.exe
   • KAV.exe - 1KAV.exe
   • kavmm.exe - 1kavmm.exe
   • KAVPF.exe - 1KAVPF.exe
   • LUALL.EXE - 1LUALL.EXE
   • LUINSDLL.DLL - 1LUINSDLL.DLL
   • Luupdate.exe - 1Luupdate.exe
   • Mcshield.exe - 1Mcshield.exe
   • NAVAPSVC.EXE - 1NAVAPSVC.EXE
   • nod32.exe - 1nod32.exe
   • nod32api.dll - 1nod32api.dll
   • nod32kui.exe - 1nod32kui.exe
   • NPFMNTOR.EXE - 1NPFMNTOR.EXE
   • npfmsg.exe - 1npfmsg.exe
   • Nvccf0D.dll - 1Nvccf0D.dll
   • Nvcevlog.dll - 1Nvcevlog.dll
   • Nvcod.exe - 1Nvcod.exe
   • Nvcte.exe - 1Nvcte.exe
   • Nvcut.exe - 1Nvcut.exe
   • OCONNDLG.DLL - 1OCONNDLG.DLL
   • OCOOKDLG.DLL - 1OCOOKDLG.DLL
   • outpost.exe - 1outpost.exe
   • pccguide.exe - 1pccguide.exe
   • PcCtlCom.exe - 1PcCtlCom.exe
   • python23.dll - 1python23.dll
   • QHPF.EXE - 1QHPF.EXE
   • Realmon.exe - 1Realmon.exe
   • RuLaunch.exe - 1RuLaunch.exe
   • schface.dll - 1schface.dll
   • SNDSrvc.exe - S1NDSrvc.exe
   • SPBBCSvc.exe - S1PBBCSvc.exe
   • spiderml.exe - s1piderml.exe
   • symlcsvc.exe - s1ymlcsvc.exe
   • T2w32.dll - T12w32.dll
   • Tmntsrv.exe - T1mntsrv.exe
   • TmPfw.exe - Tm1Pfw.exe
   • tmproxy.exe - tm1proxy.exe
   • Up2Date.exe - U1p2Date.exe
   • upgrepl.exe - u1pgrepl.exe
   • Vba32ECM.exe - V1ba32ECM.exe
   • Vba32ifs.exe - V1ba32ifs.exe
   • vba32ldr.exe - v1ba32ldr.exe
   • Vba32PP3.exe - V1ba32PP3.exe
   • vbaifps.dll - vb1aifps.dll
   • vetredir.dll - v1etredir.dll
   • Vshwin32.exe - Vs1hwin32.exe
   • VsStat.exe - Vs1Stat.exe
   • vsvault.dll - vs1vault.dll
   • XT1922.dll - XT11922.dll
   • zatutor.exe - za1tutor.exe
   • zlavscan.dll - zla1vscan.dll
   • zlclient.exe - zl1client.exe
   • zonealarm.exe - zo1nealarm.exe
     
     
8. Stops the following services, and sets their start type to 4 which disables the service:
   
   
   • Ahnlab task Scheduler
   • alerter
   • AlertManger
   • AntiVir Service
   • aswUpdSv
   • Ati HotKey Poller
   • avast! Antivirus
   • AVEService
   • AVExch32Service
   • avg7alrt
   • avg7updsvc
   • AvgCore
   • AvgFsh
   • AvgServ
   • AVIRAMailService
   • AVIRAService
   • avpcc
   • AVUPDService
   • AVWUpSrv
   • AvxIni
   • awhost32
   • backweb client - 4476822
   • BackWeb Client - 7681197
   • backweb client-4476822
   • bdss
   • BlackICE
   • CAISafe
   • ccEvtMgr
   • ccPwdSvc
   • ccSetMgr
   • ccSetMgr.exe
   • DefWatch
   • dvpapi
   • dvpinit
   • F-Secure Gatekeeper Handler Starter
   • fsbwsys
   • fsdfwd
   • FSMA
   • Guard NT
   • InoRpc
   • InoRT
   • InoTask
   • KAVMonitorService
   • kavsvc
   • KLBLMain
   • McAfee Firewall
   • McAfeeFramework
   • McShield
   • McTaskManager
   • mcupdmgr.exe
   • MCVSRte
   • MonSvcNT
   • navapsvc
   • Network Associates Log Service
   • nipsvc
   • NISSERV
   • NISUM
   • NOD32ControlCenter
   • NOD32Service
   • Norman NJeeves
   • Norman Type-R
   • 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
   • SBService
   • schscnt
   • SharedAccess
   • SmcService
   • SNDSrvc
   • SPBBCSvc
   • SpiderNT
   • SweepNet
   • SWEEPSRV.SYS
   • Symantec AntiVirus Client
   • Symantec Core LC
   • Tmntsrv
   • V3MonNT
   • V3MonSvc
   • Vba32ECM
   • Vba32ifs
   • Vba32Ldr
   • Vba32PP3
   • VexiraAntivirus
   • VisNetic AntiVirus Plug-in
   • vsmon
   • vsserv
   • wuauserv
   • xcomm
     
     
9. Checks the following domains, some of which are security related, and may block further connections to them:
   
   193.69.114.12
   212.113.20.69
   213.219.245.4
   213.248.60.121
   216.200.68.152
   62.146.66.181
   63.210.193.12
   84.53.142.22
   84.53.142.6
   ad.doubleclick.net
   ad.fastclick.net
   ads.fastclick.net
   antivir.de
   anti-virus.by
   ar.atwola.com
   atdmt.com
   avast.com
   avira.com
   avp.ch
   avp.com
   avp.ru
   awaps.net
   banner.fastclick.net
   banners.fastclick.net
   bitdefender.com
   bitdefender.ru
   ca.com
   clamav.net
   clamwin.com
   click.atdmt.com
   clicks.atdmt.com
   customer.symantec.com
   database.clamav.net
   dispatch.mcafee.com
   download.ikarus.at
   download.mcafee.com
   download.microsoft.com
   download25.avast.com
   downloadhosting.core.ignum.cz
   downloads.avira.com
   downloads.microsoft.com
   downloads1.kaspersky-labs.com
   downloads2.kaspersky-labs.com
   downloads3.kaspersky-labs.com
   downloads4.kaspersky-labs.com
   downloads-eu1.kaspersky-labs.com
   downloads-us1.kaspersky-labs.com
   downloads-us2.kaspersky-labs.com
   downloads-us3.kaspersky-labs.com
   drweb.com
   drweb.ru
   engine.awaps.net
   esetsoftware.com
   fastclick.net
   files.referats.net
   f-secure.com
   ftp.avp.ch
   ftp.downloads2.kaspersky-labs.com
   ftp.f-secure.com
   ftp.kasperskylab.ru
   ftp.sophos.com
   ftpav.ca.com
   gin.ba.euroweb.sk
   go.microsoft.com
   grisoft.com
   hbedv.com
   ids.kaspersky-labs.com
   ikarus-software.at
   kaspersky.com
   kaspersky.ru
   kaspersky-labs.com
   liveupdate.symantec.com
   liveupdate.symantecliveupdate.com
   mast.mcafee.com
   mcafee.com
   media.fastclick.net
   msdn.microsoft.com
   msk4.drweb.com
   my-etrust.com
   nai.com
   networkassociates.com
   niutwo.norman.no
   office.microsoft.com
   open.by
   pandasoftware.com
   phx.corporate-ir.net
   rads.mcafee.com
   ravantivirus.com
   report.bitdefender.com
   rs02.avast.com
   rs03.avast.com
   rs06.avast.com
   rs07.avast.com
   rs08.avast.com
   rs10.avast.com
   rs11.avast.com
   rs18.avast.com
   rs18.avast.com
   rs20.avast.com
   rs24.avast.com
   secure.nai.com
   securityresponse.symantec.com
   service1.symantec.com
   sm01.avast.com
   sm04.avast.com
   sm05.avast.com
   sm09.avast.com
   sm12.avast.com
   sm13.avast.com
   sm14.avast.com
   sm15.avast.com
   sm16.avast.com
   sm17.avast.com
   sm19.avast.com
   sm21.avast.com
   sm22.avast.com
   sm23.avast.com
   sm25.avast.com
   sophos.com
   spd.atdmt.com
   support.microsoft.com
   symantec.com
   trendmicro.com
   update.symantec.com
   updates.symantec.com
   updates1.kaspersky-labs.com
   updates2.kaspersky-labs.com
   updates3.kaspersky-labs.com
   updates4.kaspersky-labs.com
   updates5.kaspersky-labs.com
   upgrade.bitdefender.com
   us.mcafee.com
   vba32.de
   vil.nai.com
   viruslist.com
   viruslist.ru
   windowsupdate.microsoft.com
   www.antivir.de
   www.anti-virus.by
   www.avast.com
   www.avira.com
   www.avp.ch
   www.avp.com
   www.avp.ru
   www.awaps.net
   www.bitdefender.com
   www.bitdefender.ru
   www.ca.com
   www.ca.com
   www.clamav.net
   www.clamwin.com
   www.drweb.com
   www.fastclick.net
   www.f-secure.com
   www.grisoft.com
   www.hacksoft.com.pe
   www.hbedv.com
   www.kaspersky.com
   www.kaspersky.ru
   www.kaspersky-labs.com
   www.mcafee.com
   www.my-etrust.com
   www.nai.com
   www.networkassociates.com
   www.open.by
   www.pandasoftware.com
   www.ravantivirus.com
   www.sophos.com
   www.symantec.com
   www.trendmicro.com
   www.vba32.de
   www.viruslist.com
   www.viruslist.ru
   www2.eset.com
   www3.ca.com
   zak.avira.com
   

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

REMOVAL

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. Delete any values added to the registry.
   

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:

• How to disable or enable Windows Me System Restore
• How to turn off or turn on Windows XP System Restore

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.
   • For Norton AntiVirus consumer products: Read the document: How to configure Norton AntiVirus to scan all files.
   • For Symantec AntiVirus Enterprise products: Read the document: How to verify that a Symantec Corporate antivirus product is set to scan all 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 delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.

1. Click Start > Run.
2. Type regedit
3. Click OK.
   
   Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.
   
   
4. Navigate to the subkey:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun
   
   
5. In the right pane, delete the value:
   
   "key2" = "%System%winlog.exe"
   
   
6. Exit the Registry Editor.