Trojan.Tooso.E

Risk Level 2: Low

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Discovered: March 4, 2005

Updated: February 13, 2007 12:34:39 PM

Type: Trojan Horse

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

When Trojan.Tooso.E runs, it does the following:

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).
Drops Trojan.Tooso as the following file:

%System%\wiwshost.exe
Adds the value:

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

to the registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Runso that the Trojan.Tooso.E runs every time Windows starts.
Attempts to find the explorer.exe process and inject wiwshost.exe into it. All subsequent actions are taken by wiwshost.exe and will appear to be taken by explorer.exe.
Starts a thread that disables services with the following name:
- Ahnlab task Scheduler
- alerter
- AlertManger
- AVExch32Service
- avg7alrt
- avg7updsvc
- AvgCore
- AvgFsh
- AvgServ
- AVPCC
- avpcc
- AVUPDService
- AvxIni
- awhost32
- backweb client-4476822
- backweb client - 4476822
- BackWeb Client - 7681197
- BlackICE
- CAISafe
- ccEvtMgr
- ccPwdSvc
- ccSetMgr
- ccSetMgr.exe
- DefWatch
- dvpapi
- dvpinit
- F-Secure Gatekeeper Handler Starter
- fsbwsys
- FSDFWD
- fsdfwd
- FSMA
- KAVMonitorService
- kavsvc
- KLBLMain
- McAfee Firewall
- McAfeeFramework
- McShield
- McTaskManager
- mcupdmgr.exe
- MCVSRte
- MonSvcNT
- 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
- SmcService
- SNDSrvc
- SPBBCSvc
- SweepNet
- SWEEPSRV.SYS
- Symantec AntiVirus Client
- Symantec Core LC
- Tmntsrv
- V3MonNT
- V3MonSvc
- VexiraAntivirus
- VisNetic AntiVirus Plug-in
- vsmon
- wuauserv
- XCOMM
Attempts to delete the following registry entries, preventing security related programs from running when Windows starts:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\McAfee.InstantUpdate.Monitor HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\APVXDWIN HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\avg7_cc HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\avg7_emc HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ccApp HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\KAV50 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\McAfee Guardian HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NAV CfgWiz HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SSC_UserPrompt HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Symantec NetDriver Monitor HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Zone Labs Client HKEY_LOCAL_MACHINE\SOFTWARE\Agnitum HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab HKEY_LOCAL_MACHINE\SOFTWARE\McAfee HKEY_LOCAL_MACHINE\SOFTWARE\Panda Software HKEY_LOCAL_MACHINE\SOFTWARE\Symantec HKEY_LOCAL_MACHINE\SOFTWARE\Zone Labs
Starts a thread that attempts to delete all instances of files from all fixed drives with the following names:
- a5v.dll
- AUPD1ATE.EXE
- AUPDATE.EXE
- av.dll
- Av1synmgr.exe
- Avc1onsol.exe
- Avconsol.exe
- avg23emc.exe
- avgc3c.exe
- avgcc.exe
- avgemc.exe
- Avsynmgr.exe
- C1CSETMGR.EXE
- c6a5fix.exe
- cafix.exe
- CC1EVTMGR.EXE
- cc1l30.dll
- ccA1pp.exe
- ccApp.exe
- CCEVTMGR.EXE
- ccl30.dll
- CCSETMGR.EXE
- ccv1rtrst.dll
- ccvrtrst.dll
- CM1Grdian.exe
- CMGrdian.exe
- is5a6fe.exe
- isafe.exe
- K2A2V.exe
- KAV.exe
- kav12mm.exe
- kavmm.exe
- LUAL1L.EXE
- LUALL.EXE
- LUI1NSDLL.DLL
- LUINSDLL.DLL
- Luup1date.exe
- Luupdate.exe
- Mcsh1ield.exe
- Mcshield.exe
- mysuperprog.exe
- NAV1APSVC.EXE
- NAVAPSVC.EXE
- NPFM1NTOR.EXE
- NPFMNTOR.EXE
- outp1ost.exe
- outpost.exe
- RuLa1unch.exe
- RuLaunch.exe
- s1ymlcsvc.exe
- SND1Srvc.exe
- SNDSrvc.exe
- SP1BBCSvc.exe
- SPBBCSvc.exe
- symlcsvc.exe
- Up222Date.exe
- Up2Date.exe
- ve6tre5dir.dll
- vetredir.dll
- Vs1Stat.exe
- vs6va5ult.dll
- Vshw1in32.exe
- Vshwin32.exe
- VsStat.exe
- vsvault.dll
- zatu6tor.exe
- zatutor.exe
- zatutor.exe
- zl5avscan.dll
- zlavscan.dll
- zlavscan.dll
- zlcli6ent.exe
- zlclient.exe
- zo3nealarm.exe
- zonealarm.exe
- zonealarm.exe
Starts a thread that attempts to disable the following services:
- SharedAccess
- wscsvc
Starts a thread that attempts to end processes with the following name:
- 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.EX
- ESCANHNT.EXE
- FIREWALL.EXE
- ICSSUPPNT.EXE
- ICSUPP95.EXE
- LUALL.EXE
- MCUPDATE.EXE
- NUPGRADE.EXE
- NUPGRADE.EXE
- OUTPOST.EXE
- UPDATE.EXE
- UPGRADER.EXE
Starts a thread that attempts to download files from the following URLs in the sequence given. The first attempt occurs when the Trojan is launched and subsequent attempts occur at six-hour intervals. The Trojan downloads the file %Windir%\ile.exe and runs it. At the time of writing, this file was not available at these URLs:
- www.amanit.ru/zo2.jpg
- www.anthonyflanagan.com/zo2.jpg
- www.approved1stmortgage.com/zo2.jpg
- www.argument.h12.ru/zo2.jpg
- www.arkebek.de/zo2.jpg
- www.artek.org/zo2.jpg
- www.asianfestival.nl/zo2.jpg
- www.astergut.at/zo2.jpg
- www.aviation-center.de/zo2.jpg
- www.bbsh.org/zo2.jpg
- www.besino.com/zo2.jpg
- www.bestbuy.de/zo2.jpg
- www.beta.mtw.ru/zo2.jpg
- www.bga-gsm.ru/zo2.jpg
- www.blessino.com/zo2.jpg
- www.blueeyeinc.com/zo2.jpg
- www.breaklight.be/zo2.jpg
- www.brzesko.net.pl/zo2.jpg
- www.catsystem.com.kg/zo2.jpg
- www.cdnpartner.com.pl/zo2.jpg
- www.ceskyhosting.cz/zo2.jpg
- www.channeland.com/zo2.jpg
- www.compsolutionstore.com/zo2.jpg
- www.concept.kg/zo2.jpg
- www.corpsite.com/zo2.jpg
- www.couponcapital.net/zo2.jpg
- www.DarrkSydebaby.com/zo2.jpg
- www.dehut-westerhoven.nl/zo2.jpg
- www.dhl.kg/zo2.jpg
- www.dierollendedisco.de/zo2.jpg
- www.discobaradventure.be/zo2.jpg
- www.e-nfo.com/zo2.jpg
- www.e-power.com.cn/zo2.jpg
- www.ecobank.kg/zo2.jpg
- www.elenalazar.com/zo2.jpg
- www.epicbiz.com/zo2.jpg
- www.europa.kg/zo2.jpg
- www.everett.wednet.edu/zo2.jpg
- www.externet.hu/zo2.jpg
- www.forester.kg/zo2.jpg
- www.fotocliparts.de/zo2.jpg
- www.fotonw.org/zo2.jpg
- www.freesites.com.br/zo2.jpg
- www.funbunker.de/zo2.jpg
- www.funworld.tv/zo2.jpg
- www.gameser.com@share.gameser.com/zo2.jpg
- www.gci-bln.de/zo2.jpg
- www.gcnet.ru/zo2.jpg
- www.giantrevenue.com/zo2.jpg
- www.himpsi.org/zo2.jpg
- www.i3dvr.com/zo2.jpg
- www.ibigmart.net/zo2.jpg
- www.idb-group.net/zo2.jpg
- www.illusionoflife.net/zo2.jpg
- www.infocuspromo.com/zo2.jpg
- www.irinaswelt.de/zo2.jpg
- www.jansenboiler.com/zo2.jpg
- www.jasnet.pl/zo2.jpg
- www.jcribeiro.com/zo2.jpg
- www.jewelleryamberproducts.com/zo2.jpg
- www.jimvann.com/zo2.jpg
- www.jldr.ca/zo2.jpg
- www.jordanramey.net/zo2.jpg
- www.joy-musik-sound.de/zo2.jpg
- www.justrepublicans.com/zo2.jpg
- www.katel.kg/zo2.jpg
- www.knicks.nl/zo2.jpg
- www.koebers.pl/zo2.jpg
- www.kogaionon.com/zo2.jpg
- www.kplus.kg/zo2.jpg
- www.kradtraining.de/zo2.jpg
- www.kranenberg.de/zo2.jpg
- www.kranenberg.de:113547@/zo2.jpg
- www.kstrus.com.pl/zo2.jpg
- www.ktsonline.de/zo2.jpg
- www.lahelaino.com/zo2.jpg
- www.lawform.com.au/zo2.jpg
- www.leetexgroup.com/zo2.jpg
- www.leshrak.de/zo2.jpg
- www.leshrak.de:prophets@/zo2.jpg
- www.logoseiten.de/zo2.jpg
- www.magicbottle.com.tw/zo2.jpg
- www.mcuserver.cz/zo2.jpg
- www.mega-spass.com/zo2.jpg
- www.mega.kg/zo2.jpg
- www.mepbisu.de/zo2.jpg
- www.mepmh.de/zo2.jpg
- www.mtfdesign.com/zo2.jpg
- www.mtransit.kg/zo2.jpg
- www.neotech.kg/zo2.jpg
- www.nikonfotoshare.com/zo2.jpg
- www.novosti.kg/zo2.jpg
- www.ok.kg/zo2.jpg
- www.onepositiveplace.org/zo2.jpg
- www.online.kg/zo2.jpg
- www.orangesuburban.5u.com/zo2.jpg
- www.otv.ch/zo2.jpg
- www.pageantpage.com/zo2.jpg
- www.pankration.com/zo2.jpg
- www.para-agility.com/zo2.jpg
- www.pdxracing.net/zo2.jpg
- www.pfadfinder-leobersdorf.com/zo2.jpg
- www.pipni.cz/zo2.jpg
- www.pjwstk.edu.pl/zo2.jpg
- www.polizeimotorrad.de/zo2.jpg
- www.proway-consulting.com/zo2.jpg
- www.pugetsoundyc.org/zo2.jpg
- www.pyrlandia-boogie.pl/zo2.jpg
- www.qphoto.co.za/zo2.jpg
- www.raecoinc.com/zo2.jpg
- www.realgps.com/zo2.jpg
- www.realty.kg/zo2.jpg
- www.redlightpictures.com/zo2.jpg
- www.reliance-yachts.com/zo2.jpg
- www.relocationflorida.com/zo2.jpg
- www.rentalstation.com/zo2.jpg
- www.rieraquadros.com.br/zo2.jpg
- www.roaming.kg/zo2.jpg
- www.sacohalle.be/zo2.jpg
- www.scanex-medical.fi/zo2.jpg
- www.scoping4success.com/zo2.jpg
- www.sert.ru/zo2.jpg
- www.sigi.lu/zo2.jpg
- www.spadochron.pl/zo2.jpg
- www.ssc.kg/zo2.jpg
- www.ssmifc.ca/zo2.jpg
- www.stadtmeyers.de/zo2.jpg
- www.stadtmeyers.de:R2D2c3po@/zo2.jpg
- www.sterlingirb.com/zo2.jpg
- www.sunassetholdings.com/zo2.jpg
- www.szantomierz.art.pl/zo2.jpg
- www.szosa.pl/zo2.jpg
- www.tambourenvereine.ch/zo2.jpg
- www.tarnow.opoka.org.pl/zo2.jpg
- www.tc-muraene.com/zo2.jpg
- www.tc-muraene.com:hunter@/zo2.jpg
- www.theroyalregistry.com/zo2.jpg
- www.transportation.gov.bh/zo2.jpg
- www.tumar.kg/zo2.jpg
- www.tunguska.hu/zo2.jpg
- www.turkeyhomes.com/zo2.jpg
- www.turkeyhomes.com@/zo2.jpg
- www.ulpiano.org/zo2.jpg
- www.unicity.pl/zo2.jpg
- www.vbw.info/zo2.jpg
- www.velezcourtesymanagement.com/zo2.jpg
- www.vorrix.com/zo2.jpg
- www.webpark.pl/zo2.jpg
- www.wecompete.com/zo2.jpg
- www.wp.pl/zo2.jpg
- www.wwwebad.com/zo2.jpg
- www.xpager321.wz.cz/zo2.jpg
- www.yamdiamonds.com/zo2.jpg
- www.zander-yachting.com/zo2.jpg
Overwrites the infected computer's hosts file with the following lines to disable access to the security-related hosts listed:

127.0.0.1 localhost 127.0.0.1 ad.doubleclick.net 127.0.0.1 ad.fastclick.net 127.0.0.1 ads.fastclick.net 127.0.0.1 ar.atwola.com 127.0.0.1 atdmt.com 127.0.0.1 avp.ch 127.0.0.1 avp.com 127.0.0.1 avp.ru 127.0.0.1 awaps.net 127.0.0.1 banner.fastclick.net 127.0.0.1 banners.fastclick.net 127.0.0.1 ca.com 127.0.0.1 click.atdmt.com 127.0.0.1 clicks.atdmt.com 127.0.0.1 dispatch.mcafee.com 127.0.0.1 download.mcafee.com 127.0.0.1 download.microsoft.com 127.0.0.1 downloads.microsoft.com 127.0.0.1 engine.awaps.net 127.0.0.1 fastclick.net 127.0.0.1 f-secure.com 127.0.0.1 ftp.f-secure.com 127.0.0.1 ftp.sophos.com 127.0.0.1 go.microsoft.com 127.0.0.1 liveupdate.symantec.com 127.0.0.1 mast.mcafee.com 127.0.0.1 mcafee.com 127.0.0.1 media.fastclick.net 127.0.0.1 msdn.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 office.microsoft.com 127.0.0.1 phx.corporate-ir.net 127.0.0.1 secure.nai.com 127.0.0.1 securityresponse.symantec.com 127.0.0.1 service1.symantec.com 127.0.0.1 sophos.com 127.0.0.1 spd.atdmt.com 127.0.0.1 support.microsoft.com 127.0.0.1 symantec.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 vil.nai.com 127.0.0.1 viruslist.ru 127.0.0.1 windowsupdate.microsoft.com 127.0.0.1 www.avp.ch 127.0.0.1 www.avp.com 127.0.0.1 www.avp.ru 127.0.0.1 www.awaps.net 127.0.0.1 www.ca.com 127.0.0.1 www.fastclick.net 127.0.0.1 www.f-secure.com 127.0.0.1 www.kaspersky.ru 127.0.0.1 www.mcafee.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.sophos.com 127.0.0.1 www.symantec.com 127.0.0.1 www.trendmicro.com 127.0.0.1 www.viruslist.ru 127.0.0.1ftp:/ /ftp.kasperskylab.ru/updates/127.0.0.1ftp:/ /ftp.avp.ch/updates/127.0.0.1 /www.kaspersky.ru/updates/ 127.0.0.1 /updates1.kaspersky-labs.com/updates/ 127.0.0.1 /updates3.kaspersky-labs.com/updates/ 127.0.0.1 /updates4.kaspersky-labs.com/updates/ 127.0.0.1 /updates2.kaspersky-labs.com/updates/ 127.0.0.1 /updates5.kaspersky-labs.com/updates/ 127.0.0.1 /downloads1.kaspersky-labs.com/updates/ 127.0.0.1 /www.kaspersky-labs.com/updates/ 127.0.0.1ftp:/ /updates3.kaspersky-labs.com/updates/127.0.0.1ftp:/ /downloads1.kaspersky-labs.com/updates/127.0.0.1 www3.ca.com 127.0.0.1 ids.kaspersky-labs.com 127.0.0.1 downloads2.kaspersky-labs.com 127.0.0.1 downloads1.kaspersky-labs.com 127.0.0.1 downloads3.kaspersky-labs.com 127.0.0.1 downloads4.kaspersky-labs.com 127.0.0.1 liveupdate.symantecliveupdate.com 127.0.0.1 liveupdate.symantec.com 127.0.0.1 update.symantec.com 127.0.0.1 download.mcafee.com 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 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 www.trendmicro.com 127.0.0.1 www.grisoft.com

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: Paul Mangan

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