Discovered: March 23, 2004
Updated: February 13, 2007 12:20:06 PM
Also Known As: W32.HLLW.Polybot.B, W32/Gaobot.worm.gen.d [McAfee], Phatbot
Type: Worm
Systems Affected: Windows



W32.Gaobot.SA is a worm that attempts to spread through network shares that have weak passwords and allows attackers to access an infected computer using a predetermined IRC channel.

The worm uses multiple vulnerabilities to spread, including:



Notes:
  • Virus definitions dated March 23, 2004 may detect this as W32.HLLW.Polybot.B.
  • The worm has an MD5 hash value of 0xD8B1550B56992C19C34063653E50FD09.



Antivirus Protection Dates

  • Initial Rapid Release version March 23, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version March 23, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • 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: Fergal Ladley

Discovered: March 23, 2004
Updated: February 13, 2007 12:20:06 PM
Also Known As: W32.HLLW.Polybot.B, W32/Gaobot.worm.gen.d [McAfee], Phatbot
Type: Worm
Systems Affected: Windows


When W32.Gaobot.SA is executed, it performs the following actions:

  1. Copies itself as %System%\Hallowelt.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. If the originally executed file is not %System%\Hallowelt.exe, it will close the file and execute Hallowelt.exe.

  3. If the originally executed file was not %System%\Hallowelt.exe, it deletes the originally executed file.

  4. Adds the value:

    "yeahdude.exe"="hallowelt.exe"

    to the registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices

    so that the worm runs when you start Windows.

  5. Adds the following lines to the file %System%\drivers\etc\hosts, so that attempts to connect to these Web sites fail:
    127.0.0.1 www.trendmicro.com
    127.0.0.1 trendmicro.com
    127.0.0.1 rads.mcafee.com
    127.0.0.1 customer.symantec.com
    127.0.0.1 liveupdate.symantec.com
    127.0.0.1 us.mcafee.com
    127.0.0.1 updates.symantec.com
    127.0.0.1 update.symantec.com
    127.0.0.1 www.nai.com
    127.0.0.1 nai.com
    127.0.0.1 secure.nai.com
    127.0.0.1 dispatch.mcafee.com
    127.0.0.1 download.mcafee.com

  6. Attempts to spread to other computers using a number of methods, including:
    • Sending itself to the backdoor port, which the Beagle family of worms opens
    • Sending itself to the backdoor port, which the Mydoom family of worms opens
    • Using the WebDAV vulnerability
    • Using the RPC DCOM vulnerability

  7. Connects to an IRC channel and awaits commands. The worm recognizes a large number of commands and can be instructed to (among other things):
    • Run commands
    • Retrieve files via FTP and HTTP
    • Restart the computer
    • List processes
    • Kill a particular process
    • Perform HTTP, ICMP, SYN, and UDP floods
    • Retrieve email addresses stored on the computer
    • Retrieve a list of email addresses via HTTP
    • Retrieve a given URL
    • Measure the speed of its Internet connection by sending HTTP GET request to the following hosts:
      • de.yahoo.com
      • nitro.ucsc.edu
      • verio.fr
      • www.1und1.de
      • www.above.net
      • www.belwue.de
      • www.burst.net
      • www.cogentco.com
      • www.d1asia.com
      • www.level3.com
      • www.lib.nthu.edu.tw
      • www.nifty.com
      • www.nocster.com
      • www.rit.edu
      • www.schlund.net
      • www.st.lib.keio.ac.jp
      • www.stanford.edu
      • www.switch.ch
      • www.utwente.nl
      • www.verio.com
      • www.xo.net
      • yahoo.co.jp

    • Sniff HTTP, FTP, and IRC traffic
    • Disable other worms by deleting their files and associated registry values and terminating their processes

  8. Opens a randomly selected TCP port and sends a copy of itself to any remote process that connects to that port.

  9. Starts an FTP server on a randomly selected TCP port.

  10. Attempts to terminate any of the following processes:
    • _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
    • AUTO-PROTECT.NAV80TRY.EXE
    • AUTODOWN.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
    • F-AGOBOT.EXE
    • F-PROT.EXE
    • F-PROT95.EXE
    • F-STOPW.EXE
    • FAMEH32.EXE
    • FAST.EXE
    • FCH32.EXE
    • FIH32.EXE
    • FINDVIRU.EXE
    • FIREWALL.EXE
    • FLOWPROTECTOR.EXE
    • FNRB32.EXE
    • FP-WIN.EXE
    • FP-WIN_TRIAL.EXE
    • FPROT.EXE
    • FRW.EXE
    • FSAA.EXE
    • FSAV.EXE
    • FSAV32.EXE
    • FSAV530STBYB.EXE
    • FSAV530WTBYB.EXE
    • FSAV95.EXE
    • FSGK32.EXE
    • FSM32.EXE
    • FSMA32.EXE
    • FSMB32.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
    • TDS-3.EXE
    • TDS2-98.EXE
    • TDS2-NT.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
    • WIN-BUGSFIX.EXE
    • WIN32.EXE
    • WIN32US.EXE
    • WINACTIVE.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

  11. Tries to copy itself to other computers through the following shares:
  • c$
  • d$
  • e$
  • print$
  • admin$
    using the following user names and passwords, as well as any user names found using NetUserEnum():

    User names:
      • aaa
      • abc
      • Admin
      • admin
      • administrador
      • Administrador
      • Administrat
      • Administrateur
      • Administrator
      • administrator
      • admins
      • asdf
      • bill
      • colin
      • computer
      • Convidado
      • Coordinatore
      • database
      • Default
      • Dell
      • dick
      • erik
      • Gast
      • george
      • Guest
      • home
      • Inviter
      • jim
      • kanri
      • kanri-sha
      • karl
      • kate
      • mark
      • mary
      • mgmt
      • mike
      • mypc
      • mysql
      • OEM
      • Ospite
      • Owner
      • OWNER
      • owner
      • patrick
      • peter
      • qwer
      • root
      • server
      • sql
      • stacey
      • stacy
      • Standard
      • stefan
      • steve
      • steven
      • student
      • teacher
      • temp
      • Test
      • tim
      • tom
      • user
      • User
      • Verwalter
      • win
      • wwwadmin
      • xyz

        Passwords:
      • !@#$
      • !@#$%
      • !@#$%^
      • !@#$%^&
      • !@#$%^&*
      • 000000
      • 00000000
      • 007
      • 110
      • 111
      • 111111
      • 11111111
      • 121212
      • 123
      • 123123
      • 1234
      • 12345
      • 123456
      • 1234567
      • 12345678
      • 123456789
      • 1234qwer
      • 123abc
      • 123asd
      • 123qwe
      • 1776
      • 1778
      • 2002
      • 2004
      • 2525
      • 2600
      • 54321
      • 654321
      • 666
      • 88888888
      • aaa
      • abc
      • abc123
      • abcd
      • ACCESS
      • Admin
      • admin
      • admin$
      • admin123
      • administrador
      • Administrador
      • Administrat
      • Administrateur
      • ADMINISTRATOR
      • Administrator
      • administrator
      • admins
      • alpha
      • ami
      • amie
      • asdf
      • asdfgh
      • asdfghjkl
      • askaban
      • ASP
      • athlon
      • azerty
      • azkaban
      • baby
      • backdoor
      • BACKUP
      • beer
      • biere
      • bill
      • bong
      • BOX
      • box
      • Box
      • buckbeak
      • c$=c:
      • carte
      • cauldron
      • cederom
      • changeme
      • CNN
      • colin
      • computer
      • Convidado
      • Coordinatore
      • copin
      • copine
      • cran
      • crash
      • d$=d:
      • database
      • Default
      • Dell
      • dementor
      • devil
      • dick
      • dope
      • drugs
      • dude
      • dumbledore
      • e$=e:
      • ecran
      • enable
      • erik
      • fanny
      • feds
      • fish
      • foobar
      • fool
      • freak
      • fucked
      • Gast
      • gay
      • george
      • god
      • godblessyou
      • gryffindor
      • Guest
      • hagrid
      • harry
      • hax
      • hermine
      • hermione
      • hogwarts
      • home
      • homework
      • idiot
      • ihavenopass
      • imprimeur
      • Internet
      • Inviter
      • ipc$
      • iraq
      • jackdaniels
      • jim
      • kanri
      • kanri-sha
      • karl
      • kate
      • kids
      • leet
      • linux
      • LOCAL
      • Login
      • lol
      • love
      • madre
      • mark
      • mary
      • merde
      • metal
      • mgmt
      • mike
      • mince
      • moonshine
      • mouse
      • mybaby
      • mybox
      • mypass
      • mypc
      • mysql
      • newfie
      • newfy
      • noob
      • OEM
      • oil
      • opteron
      • oracle
      • ordinateur
      • Ospite
      • own
      • owned
      • Owner
      • OWNER
      • owner
      • pass
      • passwd
      • PASSWD
      • password
      • Password
      • password123
      • pat
      • patrick
      • penis
      • peter
      • PHP
      • poiut
      • poiuytrewq
      • porn
      • potter
      • private
      • pussy
      • pwd
      • pwned
      • quidditch
      • qwer
      • qwerty
      • qwertyuiop
      • r00t
      • red123
      • reseau
      • rom
      • ROOT
      • root
      • rooted
      • school
      • secret
      • secrets
      • server
      • SERVER
      • sex
      • share
      • souris
      • sql
      • stacey
      • stacy
      • Standard
      • stefan
      • steve
      • steven
      • student
      • super
      • superman
      • supersecret
      • switch
      • sybase
      • SYSTEM
      • teacher
      • TEMP
      • temp
      • tennessee
      • Tennessee
      • TEST
      • Test
      • test123
      • Texas
      • texas
      • tim
      • tom
      • UNIX
      • user
      • User
      • Usernames:
      • vagina
      • Verwalter
      • Washington
      • washington
      • werty
      • west
      • West
      • wh0re
      • whiskey
      • whisky
      • whore
      • win
      • windows2k
      • windows98
      • windowsME
      • WindowsXP
      • windoze
      • wmd
      • work
      • wwwadmin
      • xxx
      • xxyyzz
      • xyz
      • yxcv
      • zxcv
      • zxcvbnm


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: Fergal Ladley

Discovered: March 23, 2004
Updated: February 13, 2007 12:20:06 PM
Also Known As: W32.HLLW.Polybot.B, W32/Gaobot.worm.gen.d [McAfee], Phatbot
Type: Worm
Systems Affected: Windows


Removal using the Removal Tool
Symantec Security Response has developed a removal tool to clean the infections of W32.Gaobot.SA. This is the preferred method in most cases.

Manual 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. Restart the computer in Safe mode or VGA mode.
  3. Restore the Hosts file.
  4. Reverse changes to the registry.
  5. Update the virus definitions.
  6. Run a full system scan and delete all the files detected as W32.Gaobot.SA
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. Disabling 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. Restarting 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. Restoring the Windows Hosts file


Note: The location of the Hosts file may vary and some computers may not have this file. For example, if the file exists in Windows 98, it will usually be in C:\Windows; and it is located in the C:\WINNT\system32\drivers\etc folder in Windows 2000. There may also be multiple copies of this file in different locations.

Follow the instructions for your operating system:
  • Windows 98/Me/2000
    1. Click Start, point to Find or Search, and then click Files or Folders.
    2. Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
    3. In the "Named" or "Search for..." box, type:

      hosts

    4. Click Find Now or Search Now.
    5. For each one that you find, right-click it, and then click "Open With."
    6. Deselect the "Always use this program to open this program" check box.
    7. Scroll through the list of programs and double-click Notepad.
    8. Delete all of these lines:

      127.0.0.1 www.trendmicro.com
      127.0.0.1 trendmicro.com
      127.0.0.1 rads.mcafee.com
      127.0.0.1 customer.symantec.com
      127.0.0.1 liveupdate.symantec.com
      127.0.0.1 us.mcafee.com
      127.0.0.1 updates.symantec.com
      127.0.0.1 update.symantec.com
      127.0.0.1 www.nai.com
      127.0.0.1 nai.com
      127.0.0.1 secure.nai.com
      127.0.0.1 dispatch.mcafee.com
      127.0.0.1 download.mcafee.com

      Do not delete the line:

      127.0.0.1 localhost

    9. Close Notepad and save your changes when prompted.

  • Windows XP
    1. Click Start, and then click Search.
    2. Click All files and folders.
    3. In the "All or part of the file name" box, type:

      hosts

    4. Verify that "Look in" is set to "Local Hard Drives" or to (C:).
    5. Click "More advanced options."
    6. Check "Search system folders."
    7. Check "Search subfolders."
    8. Click Search.
    9. Click Find Now or Search Now.
    10. For each one that you find, right-click it, and then click "Open With."
    11. Deselect the "Always use this program to open this program" check box.
    12. Scroll through the list of programs and double-click Notepad.
    13. Delete all of these lines:

      127.0.0.1 www.trendmicro.com
      127.0.0.1 trendmicro.com
      127.0.0.1 rads.mcafee.com
      127.0.0.1 customer.symantec.com
      127.0.0.1 liveupdate.symantec.com
      127.0.0.1 us.mcafee.com
      127.0.0.1 updates.symantec.com
      127.0.0.1 update.symantec.com
      127.0.0.1 www.nai.com
      127.0.0.1 nai.com
      127.0.0.1 secure.nai.com
      127.0.0.1 dispatch.mcafee.com
      127.0.0.1 download.mcafee.com

      Do not delete the line:

      127.0.0.1 localhost

    14. Close Notepad and save your changes when prompted.

4. Reversing 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 the value:

    "yeahdude.exe"="hallowelt.exe"

  5. Follow the instructions for your operating system:
    • Windows NT/2000/XP. Skip to step h.
    • Windows 95/98/Me. Proceed to step f.

  6. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
    RunServices

  7. In the right pane, delete the value:

    "yeahdude.exe"="hallowelt.exe"

  8. Exit the Registry Editor.

  9. 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. Updating 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. Scanning for and deleting 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.SA, click Delete.


Writeup By: Fergal Ladley