Symptoms

Removal instructions:

Analyzed By

Technical Description:

The virus arrives as an executable in a zip file of an e-mail attachment
The zip file is cca 17 kb, and inside is an executable of cca 35 kb.

Consists of 5 components, mainly trojans, downloaders and droppers.

winshost.exe (~35 kb) - dropper 1
wiwshost.exe (~8 kb) - trojan/downloader 1
osa6.gif (~2 kb) - downloader 2
firewall_anti.exe (~95 kb) - dropper 2
firewall_anti.exe.dll (~70 kb) - trojan


Basicly, when run, the virus dropper creates and executes the trojan, which is injected
into explorer. Next, attempts to download and execute a file from a series of remote servers,
disables several services and applications related to security. Creates/overwrites the hosts
file with a default one. Starts the newly downloaded file, which will also download another
file, that is a dropper which creates/executes a trojan blocking av sites.

Note: since some of the virus components are independent, they may be updated and their
actions and sizes may vary slightly.


Once run, the virus (the dropper) does the following:

1. Creates the aforementioned keys and files mentioned in Symptoms.

2. Injects wiwshost.exe in explorer (which is the first dowloader)


Once wiwshost.exe (the trojan/downloader) is run, it does the folowing:

1. Deletes the following registry keys/entries:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Symantec NetDriver Monitor"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"ccApp"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"NAV CfgWiz"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"SSC_UserPrompt"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"McAfee Guardian"
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"McAfee.InstantUpdate.Monitor"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"APVXDWIN"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"KAV50"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"avg7_cc"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"avg7_emc"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Zone Labs Client
HKLM\SOFTWARE\Symantec
HKLM\SOFTWARE\McAfee
HKLM\SOFTWARE\KasperskyLab
HKLM\SOFTWARE\Agnitum
HKLM\SOFTWARE\Panda Software
HKLM\SOFTWARE\Zone Labs

2. Disables the following services:

wuauserv PAVSRV PAVFNSVR PSIMSVC Pavkre PavProt PREVSRV PavPrSrv SharedAccess navapsvc NPFMntor Outpost Firewall SAVScan SBService Symantec Core LC ccEvtMgr SNDSrvc ccPwdSvc ccSetMgr.exe SPBBCSvc KLBLMain avg7alrt avg7updsvc vsmon CAISafe avpcc fsbwsys backweb client - 4476822 backweb client-4476822 fsdfwd F-Secure Gatekeeper Handler Starter FSMA KAVMonitorService 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 OutpostFirewall NWService alerter sharedaccess NISUM NISSERV vsmon nwclnth nwclntg nwclnte nwclntf nwclntd nwclntc wuauserv navapsvc Symantec Core LC SAVScan kavsvc DefWatch Symantec AntiVirus Client NSCTOP Symantec Core LC SAVScan SAVFMSE ccEvtMgr navapsvc ccSetMgr VisNetic AntiVirus Plug-in McShield AlertManger McAfeeFramework AVExch32Service AVUPDService McTaskManager Network Associates Log Service Outbreak Manager MCVSRte mcupdmgr.exe AvgServ AvgCore AvgFsh awhost32 Ahnlab task Scheduler MonSvcNT V3MonNT V3MonSvc FSDFWD

3. Creates a thread that terminates execution of the applications:

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

4. Renames the following files:

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

5. Attempts to download and execute osa6.gif from:

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

6. Overwrites the hosts file

7. Opens notepad


Once osa6.gif is executed, it:

1. Downloads and executes 2.jpg file from keysi.ru

2. Creates a thread that listens on port 0x3C4


Once 2.jpg is executed, it does:

1. Creates a copy of itself as

2. Creates the firewall_anti.exe.dll in %WINDOWS% folder which is the mass mailer component

3. Creates the registry key in order to run at startup:

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
"firewall_anti.exe"="%WINDOWS%\firewall_anti.exe"


Once firewall_anti.exe.dll is run, it does the following:

1. Access is blocked for the following sites:

ftpav.ca.com www.pandasoftware.com pandasoftware.com clamav.net www.clamav.net www.bitdefender.com bitdefender.com ravantivirus.com www.ravantivirus.com drweb.ru www.drweb.com drweb.com antivir.de www.antivir.de 216.200.68.152 212.113.20.69 63.210.193.12 84.53.142.22 84.53.142.6 kaspersky.ru grisoft.com www3.ca.com www.viruslist.ru www.viruslist.com www.trendmicro.com www.symantec.com www.sophos.com www.networkassociates.com www.nai.com www.my-etrust.com www.mcafee.com www.kaspersky.ru www.kaspersky.com www.kaspersky-labs.com www.grisoft.com www.fastclick.net www.f-secure.com www.awaps.net www.avp.ru www.avp.com www.avp.ch windowsupdate.microsoft.com viruslist.ru viruslist.com vil.nai.com us.mcafee.com updates5.kaspersky-labs.com updates4.kaspersky-labs.com updates3.kaspersky-labs.com updates2.kaspersky-labs.com updates1.kaspersky-labs.com updates.symantec.com update.symantec.com trendmicro.com symantec.com support.microsoft.com spd.atdmt.com sophos.com service1.symantec.com securityresponse.symantec.com secure.nai.com rads.mcafee.com phx.corporate-ir.net office.microsoft.com networkassociates.com nai.com my-etrust.com msdn.microsoft.com media.fastclick.net mcafee.com mast.mcafee.com liveupdate.symantecliveupdate.com liveupdate.symantec.com kaspersky.com kaspersky-labs.com ids.kaspersky-labs.com go.microsoft.com ftp.sophos.com ftp.kasperskylab.ru ftp.f-secure.com ftp.downloads2.kaspersky-labs.com ftp.avp.ch fastclick.net f-secure.com engine.awaps.net downloads4.kaspersky-labs.com downloads3.kaspersky-labs.com downloads2.kaspersky-labs.com downloads1.kaspersky-labs.com downloads.microsoft.com downloads-us3.kaspersky-labs.com downloads-us2.kaspersky-labs.com downloads-us1.kaspersky-labs.com downloads-eu1.kaspersky-labs.com download.microsoft.com download.mcafee.com dispatch.mcafee.com customer.symantec.com clicks.atdmt.com click.atdmt.com www.ca.com ca.com banners.fastclick.net banner.fastclick.net awaps.net avp.ru avp.com avp.ch atdmt.com ar.atwola.com ads.fastclick.net ad.fastclick.net report.bitdefender.com upgrade.bitdefender.com ad.doubleclick.net

by registering itself as a packet filter thus preventing update of security related products.