W32.Gaobot.gen!poly

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Discovered: March 19, 2004
Updated: February 13, 2007 12:19:38 PM
Also Known As: W32.HLLW.Polybot, Phatbot, W32/Polybot.l!irc [McAfee], WORM_AGOBOT.HM [Trend], Backdoor.Agobot.hm [Kaspersky]
Type: Worm
Systems Affected: Windows


W32.Gaobot.gen!poly is a worm that attempts to spread through network shares with weak passwords. It also allows attackers to access an infected computer using a predetermined IRC channel.

The worm uses multiple vulnerabilities to spread, including:



Notes:
  • Virus Definitions released before March 24, 2004 detect this threat as W32.HLLW.Polybot.
  • Virus Definitions released after February 27, 2004 and before March 19, 2004 detect this threat as W32.HLLW.Gaobot.gen.




Antivirus Protection Dates

  • Initial Rapid Release version March 19, 2004
  • Latest Rapid Release version December 31, 2017 revision 020
  • Initial Daily Certified version March 19, 2004
  • Latest Daily Certified version January 01, 2018 revision 003
  • Initial Weekly Certified release date March 24, 2004

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

Writeup By: Asuka Yamamoto

Discovered: March 19, 2004
Updated: February 13, 2007 12:19:38 PM
Also Known As: W32.HLLW.Polybot, Phatbot, W32/Polybot.l!irc [McAfee], WORM_AGOBOT.HM [Trend], Backdoor.Agobot.hm [Kaspersky]
Type: Worm
Systems Affected: Windows


When W32.Gaobot.gen!poly is executed, it performs the following actions:

  1. Copies itself as one of the following files:
    • %System%\soundman.exe
    • %System%\confgldr.exe
    • %System%\spoolsvc.exe
    • %System%\winwork.exe
    • %System%\winhelp.exe
    • %System%\csrs.exe


      Note: %System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  2. Adds one of the following values:

    "^`d}qZxu" = "~`d}qzxu3zYF"

    "Configuration Loader"="confgldr.exe"

    "Video Process"="sysconf.exe" 

    "Service Host Process"="spoolsvc.exe"

    "Winmsg"="winwork.exe"

    "svchost"="winhelp.exe"

    "csrs"="csrs.exe"



    to the registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices

    so that W32.Gaobot.gen!poly runs when you start Windows.

  3. May create a service for the worm with one of the following names and sets it to automatically run on startup:
    • Configuration Loader
    • SoundMan
    • Service Host Process

  4. Hides all the files that contain the word "soun."

  5. The worm may hook the NTQuerySystemInformation API on NTDLL.DLL in an attempt to hide itself.

  6. May add the following lines to the %System%\drivers\etc\hosts file:

    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 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 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 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

  7. Connects to a predetermined IRC channel, using its own IRC client, and listens for commands.

  8. Allows an attacker to remotely control a compromised computer and perform any of the following actions:
    • Download and execute files
    • Steal system information
    • Harvest email addresses
    • Steal CD keys for various games

  9. Attempt to spread to other systems by exploiting the following vulnerabilities:
  10. Probes the following shares:
    • c$
    • print$
    • c
    • d$
    • e$
    • admin$
    using the following user names and passwords, as well as any user names found using NetUserEnum():

    User names
    • <empty>
    • a
    • aaa
    • abc
    • admin
    • Administrador
    • administrador
    • Administrateur
    • administrator
    • Administrat
    • admins
    • asdf
    • computer
    • Convidado
    • Coordinatore
    • database
    • Default
    • Dell
    • Gast
    • Guest
    • home
    • Inviter
    • kanri
    • kanri-sha
    • login
    • mary
    • mgmt
    • mysql
    • OEM
    • Ospite
    • Owner
    • owner
    • OWNER
    • pc
    • qwer
    • root
    • server
    • Standard
    • student
    • teacher
    • temp
    • Test
    • test
    • User
    • user
    • Verwalter
    • win
    • wwwadmin
    • x
    • xp
    • xyz


      Passwords:
    • 0
    • 1
    • 7
    • 12
    • 69
    • 110
    • 111
    • 123
    • 666
    • 1234
    • 2002
    • 2003
    • 2004
    • 2600
    • 12345
    • 54321
    • 111111
    • 121212
    • 123123
    • 123456
    • 654321
    • 1234567
    • 11111111
    • 12345678
    • 88888888
    • 123456789
    • !@#$
    • !@#$%
    • !@#$%^
    • !@#$%^&
    • !@#$%^&*
    • 1234qwer
    • 123abc
    • 123asd
    • 123qwe
    • a
    • aaa
    • abc
    • abc123
    • abcd
    • ACCESS
    • admin
    • Admin
    • admin123
    • Administrador
    • administrador
    • Administrateur
    • ADMINISTRATOR
    • administrator
    • admins
    • alpha
    • asdf
    • asdfgh
    • asdfghjkl
    • ASP
    • baby
    • backdoor
    • BACKUP
    • BOX
    • Box
    • box
    • changeme
    • CNN
    • computer
    • Coordinatore
    • crash
    • database
    • Default
    • devil
    • dude
    • enable
    • feds
    • fish
    • foobar
    • fucked
    • gay
    • god
    • godblessyou
    • hax
    • home
    • homework
    • idiot
    • ihavenopass
    • Internet
    • kids
    • leet
    • linux
    • LOCAL
    • login
    • Login
    • lol
    • love
    • metal
    • mybaby
    • mybox
    • mypass
    • mypc
    • noob
    • oracle
    • Ospite
    • own
    • owned
    • owner
    • pass
    • passwd
    • PASSWD
    • passwd
    • password
    • Password
    • password123
    • pat
    • patrick
    • pc
    • penis
    • PHP
    • poiuytrewq
    • porn
    • private
    • pussy
    • pw
    • pwd
    • pwned
    • qwer
    • qwerty
    • qwertyuiop
    • r00t
    • red123
    • ROOT
    • root
    • rooted
    • school
    • secret
    • secrets
    • SERVER
    • server
    • sex
    • share
    • student
    • super
    • superman
    • supersecret
    • sybase
    • SYSTEM
    • teacher
    • TEMP
    • temp
    • TEST
    • test
    • test123
    • UNIX
    • user
    • vagina
    • Verwalter
    • werty
    • wh0re
    • whore
    • win
    • windows2k
    • windows98
    • windowsME
    • WindowsXP
    • windoze
    • work
    • wwwadmin
    • x
    • xp
    • xxx
    • xxyyzz
    • yxcv
    • z
    • zxcv
    • zxcvbnm

10. Copies itself to any computers compromised using the above exploits.


11. Ends the following processes associated with antivirus and firewall software:
    • _AVP32.EXE
    • _AVPCC.EXE
    • _AVPM.EXE
    • ACKWIN32.EXE
    • ADAWARE.EXE
    • ADVXDWIN.EXE
    • AGENTSVR.EXE
    • AGENTW.EXE
    • ALERTSVC.EXE
    • ALEVIR.EXE
    • ALOGSERV.EXE
    • AMON9X.EXE
    • ANTI-TROJAN.EXE
    • ANTIVIRUS.EXE
    • ANTS.EXE
    • APIMONITOR.EXE
    • APLICA32.EXE
    • APVXDWIN.EXE
    • ARR.EXE
    • ATCON.EXE
    • ATGUARD.EXE
    • ATRO55EN.EXE
    • ATUPDATER.EXE
    • ATWATCH.EXE
    • AU.EXE
    • AUPDATE.EXE
    • AUTODOWN.EXE
    • AUTO-PROTECT.NAV80TRY.EXE
    • AUTOTRACE.EXE
    • AUTOUPDATE.EXE
    • AVCONSOL.EXE
    • AVE32.EXE
    • AVGCC32.EXE
    • AVGCTRL.EXE
    • AVGNT.EXE
    • AVGSERV.EXE
    • AVGSERV9.EXE
    • AVGUARD.EXE
    • AVGW.EXE
    • AVKPOP.EXE
    • AVKSERV.EXE
    • AVKSERVICE.EXE
    • AVKWCTl9.EXE
    • AVLTMAIN.EXE
    • AVNT.EXE
    • AVP.EXE
    • AVP32.EXE
    • AVPCC.EXE
    • AVPDOS32.EXE
    • AVPM.EXE
    • AVPTC32.EXE
    • AVPUPD.EXE
    • AVSCHED32.EXE
    • AVSYNMGR.EXE
    • AVWIN95.EXE
    • AVWINNT.EXE
    • AVWUPD.EXE
    • AVWUPD32.EXE
    • AVWUPSRV.EXE
    • AVXMONITOR9X.EXE
    • AVXMONITORNT.EXE
    • AVXQUAR.EXE
    • BACKWEB.EXE
    • BARGAINS.EXE
    • BD_PROFESSIONAL.EXE
    • BEAGLE.EXE
    • BELT.EXE
    • BIDEF.EXE
    • BIDSERVER.EXE
    • BIPCP.EXE
    • BIPCPEVALSETUP.EXE
    • BISP.EXE
    • BLACKD.EXE
    • BLACKICE.EXE
    • BLSS.EXE
    • BOOTCONF.EXE
    • BOOTWARN.EXE
    • BORG2.EXE
    • BPC.EXE
    • BRASIL.EXE
    • BS120.EXE
    • BUNDLE.EXE
    • BVT.EXE
    • CCAPP.EXE
    • CCEVTMGR.EXE
    • CCPXYSVC.EXE
    • CDP.EXE
    • CFD.EXE
    • CFGWIZ.EXE
    • CFIADMIN.EXE
    • CFIAUDIT.EXE
    • CFINET.EXE
    • CFINET32.EXE
    • Claw95.EXE
    • CLAW95CF.EXE
    • CLEAN.EXE
    • CLEANER.EXE
    • CLEANER3.EXE
    • CLEANPC.EXE
    • CLICK.EXE
    • CMD32.EXE
    • CMESYS.EXE
    • CMGRDIAN.EXE
    • CMON016.EXE
    • CONNECTIONMONITOR.EXE
    • CPD.EXE
    • CPF9X206.EXE
    • CPFNT206.EXE
    • CTRL.EXE
    • CV.EXE
    • CWNB181.EXE
    • CWNTDWMO.EXE
    • DATEMANAGER.EXE
    • DCOMX.EXE
    • DEFALERT.EXE
    • DEFSCANGUI.EXE
    • DEFWATCH.EXE
    • DEPUTY.EXE
    • DIVX.EXE
    • DLLCACHE.EXE
    • DLLREG.EXE
    • DOORS.EXE
    • DPF.EXE
    • DPFSETUP.EXE
    • DPPS2.EXE
    • DRWATSON.EXE
    • DRWEB32.EXE
    • DRWEBUPW.EXE
    • DSSAGENT.EXE
    • DVP95.EXE
    • DVP95_0.EXE
    • ECENGINE.EXE
    • EFPEADM.EXE
    • EMSW.EXE
    • ENT.EXE
    • ESAFE.EXE
    • ESCANH95.EXE
    • ESCANHNT.EXE
    • ESCANV95.EXE
    • ESPWATCH.EXE
    • ETHEREAL.EXE
    • ETRUSTCIPE.EXE
    • EVPN.EXE
    • EXANTIVIRUS-CNET.EXE
    • EXE.AVXW.EXE
    • EXPERT.EXE
    • EXPLORE.EXE
    • F-AGNT95.EXE
    • FAMEH32.EXE
    • FAST.EXE
    • FCH32.EXE
    • FIH32.EXE
    • FINDVIRU.EXE
    • FIREWALL.EXE
    • FLOWPROTECTOR.EXE
    • FNRB32.EXE
    • FPROT.EXE
    • F-PROT.EXE
    • F-PROT95.EXE
    • FP-WIN.EXE
    • FP-WIN_TRIAL.EXE
    • FRW.EXE
    • FSAA.EXE
    • FSAV.EXE
    • FSAV32.EXE
    • FSAV530STBYB.EXE
    • FSAV530WTBYB.EXE
    • FSAV95.EXE
    • FSGK32.EXE
    • FSM32.EXE
    • FSMA32.EXE
    • FSMB32.EXE
    • F-STOPW.EXE
    • GATOR.EXE
    • GBMENU.EXE
    • GBPOLL.EXE
    • GENERICS.EXE
    • GMT.EXE
    • GUARD.EXE
    • GUARDDOG.EXE
    • HACKTRACERSETUP.EXE
    • HBINST.EXE
    • HBSRV.EXE
    • HIJACKTHIS.EXE
    • HOTACTIO.EXE
    • HOTPATCH.EXE
    • HTLOG.EXE
    • HTPATCH.EXE
    • HWPE.EXE
    • HXDL.EXE
    • HXIUL.EXE
    • IAMAPP.EXE
    • IAMSERV.EXE
    • IAMSTATS.EXE
    • IBMASN.EXE
    • IBMAVSP.EXE
    • ICLOAD95.EXE
    • ICLOADNT.EXE
    • ICMON.EXE
    • ICSUPP95.EXE
    • ICSUPPNT.EXE
    • IDLE.EXE
    • IEDLL.EXE
    • IEDRIVER.EXE
    • IEXPLORER.EXE
    • IFACE.EXE
    • IFW2000.EXE
    • INETLNFO.EXE
    • INFUS.EXE
    • INFWIN.EXE
    • INIT.EXE
    • INTDEL.EXE
    • INTREN.EXE
    • IOMON98.EXE
    • IPARMOR.EXE
    • IRIS.EXE
    • ISASS.EXE
    • ISRV95.EXE
    • ISTSVC.EXE
    • JAMMER.EXE
    • JDBGMRG.EXE
    • JEDI.EXE
    • KAVLITE40ENG.EXE
    • KAVPERS40ENG.EXE
    • KAVPF.EXE
    • KAZZA.EXE
    • KEENVALUE.EXE
    • KERIO-PF-213-EN-WIN.EXE
    • KERIO-WRL-421-EN-WIN.EXE
    • KERIO-WRP-421-EN-WIN.EXE
    • KERNEL32.EXE
    • KILLPROCESSSETUP161.EXE
    • LAUNCHER.EXE
    • LDNETMON.EXE
    • LDPRO.EXE
    • LDPROMENU.EXE
    • LDSCAN.EXE
    • LNETINFO.EXE
    • LOADER.EXE
    • LOCALNET.EXE
    • LOCKDOWN.EXE
    • LOCKDOWN2000.EXE
    • LOOKOUT.EXE
    • LORDPE.EXE
    • LSETUP.EXE
    • LUALL.EXE
    • LUAU.EXE
    • LUCOMSERVER.EXE
    • LUINIT.EXE
    • LUSPT.EXE
    • MAPISVC32.EXE
    • MCAGENT.EXE
    • MCMNHDLR.EXE
    • MCSHIELD.EXE
    • MCTOOL.EXE
    • MCUPDATE.EXE
    • MCVSRTE.EXE
    • MCVSSHLD.EXE
    • MD.EXE
    • MFIN32.EXE
    • MFW2EN.EXE
    • MFWENG3.02D30.EXE
    • MGAVRTCL.EXE
    • MGAVRTE.EXE
    • MGHTML.EXE
    • MGUI.EXE
    • MINILOG.EXE
    • MMOD.EXE
    • MONITOR.EXE
    • MOOLIVE.EXE
    • MOSTAT.EXE
    • MPFAGENT.EXE
    • MPFSERVICE.EXE
    • MPFTRAY.EXE
    • MRFLUX.EXE
    • MSAPP.EXE
    • MSBB.EXE
    • MSBLAST.EXE
    • MSCACHE.EXE
    • MSCCN32.EXE
    • MSCMAN.EXE
    • MSCONFIG.EXE
    • MSDM.EXE
    • MSDOS.EXE
    • MSIEXEC16.EXE
    • MSINFO32.EXE
    • MSLAUGH.EXE
    • MSMGT.EXE
    • MSMSGRI32.EXE
    • MSSMMC32.EXE
    • MSSYS.EXE
    • MSVXD.EXE
    • MU0311AD.EXE
    • MWATCH.EXE
    • N32SCANW.EXE
    • NAV.EXE
    • NAVAP.NAVAPSVC.EXE
    • NAVAPSVC.EXE
    • NAVAPW32.EXE
    • NAVDX.EXE
    • NAVENGNAVEX15.NAVLU32.EXE
    • NAVLU32.EXE
    • NAVNT.EXE
    • NAVSTUB.EXE
    • NAVW32.EXE
    • NAVWNT.EXE
    • NC2000.EXE
    • NCINST4.EXE
    • NDD32.EXE
    • NEOMONITOR.EXE
    • NEOWATCHLOG.EXE
    • NETARMOR.EXE
    • NETD32.EXE
    • NETINFO.EXE
    • NETMON.EXE
    • NETSCANPRO.EXE
    • NETSPYHUNTER-1.2.EXE
    • NETSTAT.EXE
    • NETUTILS.EXE
    • NISSERV.EXE
    • NISUM.EXE
    • NMAIN.EXE
    • NOD32.EXE
    • NORMIST.EXE
    • NORTON_INTERNET_SECU_3.0_407.EXE
    • NOTSTART.EXE
    • NPF40_TW_98_NT_ME_2K.EXE
    • NPFMESSENGER.EXE
    • NPROTECT.EXE
    • NPSCHECK.EXE
    • NPSSVC.EXE
    • NSCHED32.EXE
    • NSSYS32.EXE
    • NSTASK32.EXE
    • NSUPDATE.EXE
    • NT.EXE
    • NTRTSCAN.EXE
    • NTVDM.EXE
    • NTXconfig.EXE
    • NUI.EXE
    • NUPGRADE.EXE
    • NVARCH16.EXE
    • NVC95.EXE
    • NVSVC32.EXE
    • NWINST4.EXE
    • NWSERVICE.EXE
    • NWTOOL16.EXE
    • OLLYDBG.EXE
    • ONSRVR.EXE
    • OPTIMIZE.EXE
    • OSTRONET.EXE
    • OTFIX.EXE
    • OUTPOST.EXE
    • OUTPOSTINSTALL.EXE
    • OUTPOSTPROINSTALL.EXE
    • PADMIN.EXE
    • PANIXK.EXE
    • PATCH.EXE
    • PAVCL.EXE
    • PAVPROXY.EXE
    • PAVSCHED.EXE
    • PAVW.EXE
    • PCC2002S902.EXE
    • PCC2K_76_1436.EXE
    • PCCIOMON.EXE
    • PCCNTMON.EXE
    • PCCWIN97.EXE
    • PCCWIN98.EXE
    • PCDSETUP.EXE
    • PCFWALLICON.EXE
    • PCIP10117_0.EXE
    • PCSCAN.EXE
    • PDSETUP.EXE
    • PENIS.EXE
    • PERISCOPE.EXE
    • PERSFW.EXE
    • PERSWF.EXE
    • PF2.EXE
    • PFWADMIN.EXE
    • PGMONITR.EXE
    • PINGSCAN.EXE
    • PLATIN.EXE
    • POP3TRAP.EXE
    • POPROXY.EXE
    • POPSCAN.EXE
    • PORTDETECTIVE.EXE
    • PORTMONITOR.EXE
    • POWERSCAN.EXE
    • PPINUPDT.EXE
    • PPTBC.EXE
    • PPVSTOP.EXE
    • PRIZESURFER.EXE
    • PRMT.EXE
    • PRMVR.EXE
    • PROCDUMP.EXE
    • PROCESSMONITOR.EXE
    • PROCEXPLORERV1.0.EXE
    • PROGRAMAUDITOR.EXE
    • PROPORT.EXE
    • PROTECTX.EXE
    • PSPF.EXE
    • PURGE.EXE
    • PUSSY.EXE
    • PVIEW95.EXE
    • QCONSOLE.EXE
    • QSERVER.EXE
    • RAPAPP.EXE
    • RAV7.EXE
    • RAV7WIN.EXE
    • RAV8WIN32ENG.EXE
    • RAY.EXE
    • RB32.EXE
    • RCSYNC.EXE
    • REALMON.EXE
    • REGED.EXE
    • REGEDIT.EXE
    • REGEDT32.EXE
    • RESCUE.EXE
    • RESCUE32.EXE
    • RRGUARD.EXE
    • RSHELL.EXE
    • RTVSCAN.EXE
    • RTVSCN95.EXE
    • RULAUNCH.EXE
    • RUN32DLL.EXE
    • RUNDLL.EXE
    • RUNDLL16.EXE
    • RUXDLL32.EXE
    • SAFEWEB.EXE
    • SAHAGENT.EXE
    • SAVE.EXE
    • SAVENOW.EXE
    • SBSERV.EXE
    • SC.EXE
    • SCAM32.EXE
    • SCAN32.EXE
    • SCAN95.EXE
    • SCANPM.EXE
    • SCRSCAN.EXE
    • SCRSVR.EXE
    • SCVHOST.EXE
    • SD.EXE
    • SERV95.EXE
    • SERVICE.EXE
    • SERVLCE.EXE
    • SERVLCES.EXE
    • SETUP_FLOWPROTECTOR_US.EXE
    • SETUPVAMEEVAL.EXE
    • SFC.EXE
    • SGSSFW32.EXE
    • SH.EXE
    • SHELLSPYINSTALL.EXE
    • SHN.EXE
    • SHOWBEHIND.EXE
    • SMC.EXE
    • SMS.EXE
    • SMSS32.EXE
    • SOAP.EXE
    • SOFI.EXE
    • SPERM.EXE
    • SPF.EXE
    • SPHINX.EXE
    • SPOLER.EXE
    • SPOOLCV.EXE
    • SPOOLSV32.EXE
    • SPYXX.EXE
    • SREXE.EXE
    • SRNG.EXE
    • SS3EDIT.EXE
    • SSG_4104.EXE
    • SSGRATE.EXE
    • ST2.EXE
    • START.EXE
    • STCLOADER.EXE
    • SUPFTRL.EXE
    • SUPPORT.EXE
    • SUPPORTER5.EXE
    • SVC.EXE
    • SVCHOSTC.EXE
    • SVCHOSTS.EXE
    • SVSHOST.EXE
    • SWEEP95.EXE
    • SWEEPNET.SWEEPSRV.SYS.SWNETSUP.EXE
    • SYMPROXYSVC.EXE
    • SYMTRAY.EXE
    • SYSEDIT.EXE
    • SYSTEM.EXE
    • SYSTEM32.EXE
    • SYSUPD.EXE
    • TASKMG.EXE
    • TASKMO.EXE
    • TASKMON.EXE
    • TAUMON.EXE
    • TBSCAN.EXE
    • TC.EXE
    • TCA.EXE
    • TCM.EXE
    • TDS2-98.EXE
    • TDS2-NT.EXE
    • TDS-3.EXE
    • TEEKIDS.EXE
    • TFAK.EXE
    • TFAK5.EXE
    • TGBOB.EXE
    • TITANIN.EXE
    • TITANINXP.EXE
    • TRACERT.EXE
    • TRICKLER.EXE
    • TRJSCAN.EXE
    • TRJSETUP.EXE
    • TROJANTRAP3.EXE
    • TSADBOT.EXE
    • TVMD.EXE
    • TVTMD.EXE
    • UNDOBOOT.EXE
    • UPDAT.EXE
    • UPDATE.EXE
    • UPGRAD.EXE
    • UTPOST.EXE
    • VBCMSERV.EXE
    • VBCONS.EXE
    • VBUST.EXE
    • VBWIN9X.EXE
    • VBWINNTW.EXE
    • VCSETUP.EXE
    • VET32.EXE
    • VET95.EXE
    • VETTRAY.EXE
    • VFSETUP.EXE
    • VIR-HELP.EXE
    • VIRUSMDPERSONALFIREWALL.EXE
    • VNLAN300.EXE
    • VNPC3000.EXE
    • VPC32.EXE
    • VPC42.EXE
    • VPFW30S.EXE
    • VPTRAY.EXE
    • VSCAN40.EXE
    • VSCENU6.02D30.EXE
    • VSCHED.EXE
    • VSECOMR.EXE
    • VSHWIN32.EXE
    • VSISETUP.EXE
    • VSMAIN.EXE
    • VSMON.EXE
    • VSSTAT.EXE
    • VSWIN9XE.EXE
    • VSWINNTSE.EXE
    • VSWINPERSE.EXE
    • W32DSM89.EXE
    • W9X.EXE
    • WATCHDOG.EXE
    • WEBDAV.EXE
    • WEBSCANX.EXE
    • WEBTRAP.EXE
    • WFINDV32.EXE
    • WGFE95.EXE
    • WHOSWATCHINGME.EXE
    • WIMMUN32.EXE
    • WIN32.EXE
    • WIN32US.EXE
    • WINACTIVE.EXE
    • WIN-BUGSFIX.EXE
    • WINDOW.EXE
    • WINDOWS.EXE
    • WININETD.EXE
    • WININIT.EXE
    • WININITX.EXE
    • WINLOGIN.EXE
    • WINMAIN.EXE
    • WINNET.EXE
    • WINPPR32.EXE
    • WINRECON.EXE
    • WINSERVN.EXE
    • WINSSK32.EXE
    • WINSTART.EXE
    • WINSTART001.EXE
    • WINTSK32.EXE
    • WINUPDATE.EXE
    • WKUFIND.EXE
    • WNAD.EXE
    • WNT.EXE
    • WRADMIN.EXE
    • WRCTRL.EXE
    • WSBGATE.EXE
    • WUPDATER.EXE
    • WUPDT.EXE
    • WYVERNWORKSFIREWALL.EXE
    • XPF202EN.EXE
    • ZAPRO.EXE
    • ZAPSETUP3001.EXE
    • ZATUTOR.EXE
    • ZONALM2601.EXE
    • ZONEALARM.EXE

12. Attempts to delete the files and registry values associated with other worms.


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: Asuka Yamamoto

Discovered: March 19, 2004
Updated: February 13, 2007 12:19:38 PM
Also Known As: W32.HLLW.Polybot, Phatbot, W32/Polybot.l!irc [McAfee], WORM_AGOBOT.HM [Trend], Backdoor.Agobot.hm [Kaspersky]
Type: Worm
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. Restart the computer in Safe mode or VGA mode.
  3. Restore the Hosts file.
  4. Reverse the changes made to the registry (removing the service and Run keys that the worm added).
  5. Update the virus definitions.
  6. Run a full system scan and delete all the files detected as W32.Gaobot.gen!poly.
For details on each of these steps, read the following instructions.


Before you begin:
If you are running Windows NT/2000/XP, make sure that you do, or have done, the following:
  • Create a secure password. This threat takes advantage of weak network passwords. (A full-time Internet connection, such as DSL or Cable, is considered a network connection for these purposes.)
  • Patch the DCOM RPC vulnerability as described in Microsoft Security Bulletin MS03-026.
  • Patch the WebDav vulnerability as described in Microsoft Security Bulletin MS03-007.



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, re-enable 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 restart the computer in Safe mode or VGA mode

Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.

  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.

3. To restore the Hosts file
The following instructions discuss how to fix the Windows host file so that the added name resolution entries do not prevent you from visiting the Web sites of antivirus vendors.
  1. Using Windows Explorer, look for a file named "hosts" in the following locations, if they exist:
    • C:\Windows\System32\Drivers\Etc\hosts
    • C:\Winnt\System32\Drivers\Etc\hosts
    • D:\Windows\System32\Drivers\Etc\hosts
    • D:\Winnt\System32\Drivers\Etc\hosts

  2. For each \hosts file that you find, double-click the file.
  3. When the "Open With" dialog box appears, scroll through the list and select Notepad. Do not check the "Always open this program with. . ." box.
  4. Delete the following lines within the file:

    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 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 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 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


    Do not delete the line:

    127.0.0.1 localhost

  5. Save the hosts file.

4. To reverse the changes made to the registry


WARNING: 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 keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete any of the following values:

    "^`d}qZxu" = "~`d}qzxu3zYF"

    "Configuration Loader"="confgldr.exe"

    "Video Process"="sysconf.exe"  

    "Service Host Process"="spoolsvc.exe"

    "svchost"="winhelp.exe"

    "csrs"="csrs.exe"

  5. Do one of the following:
    • If you are using Windows NT/2000/XP, skip to step h.
    • If you are using Windows 95/98/Me, go on to step f.

  6. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
    RunServices

  7. In the right pane, delete any of the following values:

    "^`d}qZxu" = "~`d}qzxu3zYF"

    "Configuration Loader"="confgldr.exe"

    "Video Process"="sysconf.exe"  

    "Service Host Process"="spoolsvc.exe"

    "svchost"="winhelp.exe"

    "csrs"="csrs.exe"


  8. Navigate to and delete the keys:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SoundMan
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\svc32

  9. Exit the Registry Editor.

  10. Restart the computer in Normal mode. For instructions, read the section on returning to Normal mode in the document, "How to start the computer in Safe Mode."

5. 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 the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). 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 the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

6. 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 as W32.Gaobot.gen!poly, click Delete.


Writeup By: Asuka Yamamoto