W32.Mytob.EY@mm

Printer Friendly Page

Discovered: June 16, 2005
Updated: February 13, 2007 12:40:38 PM
Also Known As: Win32.Mytob.FU [Computer Assoc, Net-Worm.Win32.Mytob.bi [Kaspe, W32/Mytob-BU [Sophos], WORM_MYTOB.FO [Trend Micro]
Type: Worm
Systems Affected: Windows


W32.Mytob.EY@mm is a mass-mailing worm that opens a back door and lowers security settings on the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version June 16, 2005
  • Latest Rapid Release version January 18, 2018 revision 001
  • Initial Daily Certified version June 16, 2005
  • Latest Daily Certified version January 18, 2018 revision 007
  • Initial Weekly Certified release date June 22, 2005

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

Writeup By: Hiroshi Shinotsuka

Discovered: June 16, 2005
Updated: February 13, 2007 12:40:38 PM
Also Known As: Win32.Mytob.FU [Computer Assoc, Net-Worm.Win32.Mytob.bi [Kaspe, W32/Mytob-BU [Sophos], WORM_MYTOB.FO [Trend Micro]
Type: Worm
Systems Affected: Windows


When W32.Mytob.EY@mm is executed, it performs the following actions:

  1. Copies itself as %System%\windsns.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).

  2. Adds the value:

    "WINDOWS SYSTEM Dns" = "windsns.exe"  

    to the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices

    so that it runs every time Windows starts.

  3. Adds the value:

    "Start" = "4"

    to the registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess

    to disable the Shared Access service in Windows 2000/XP.

    Note: The worm will recreate these registry subkeys if they are deleted.

  4. Gathers email addresses from the Windows Address Book and from the following locations:

    • %Windir%\Temporary Internet Files
    • %Userprofile%\Local Settings\Temporary Internet Files
    • %System%

      Notes:
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).
    • %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\[Current User] (Windows NT/2000/XP).

  5. Gathers email addresses from files with the following extensions on all local drives from C to Y:

    • .txt
    • .htm
    • .sht
    • .jsp
    • .cgi
    • .xml
    • .php
    • .asp
    • .dbx
    • .tbb
    • .adb
    • .html
    • .wab

  6. Appends the following prefixes to domain names in an attempt to find Simple Mail Transfer Protocol (SMTP) servers:

    • mx.
    • mail.
    • smtp.
    • mx1.
    • mxs.
    • mail1.
    • relay.
    • ns.
    • gate.

  7. Uses its own SMTP engine to send itself to the email addresses that it finds. The email has the following characteristics:

    From:
    One of the following:

    • serg
    • mary
    • ray
    • tom
    • peter
    • robert
    • bob
    • jane
    • joe
    • dan
    • dave
    • matt
    • steve
    • smith
    • stan
    • bill
    • bob
    • jack
    • fred
    • ted
    • paul
    • brent
    • sales
    • anna
    • brenda
    • claudia
    • debby
    • helen
    • jerry
    • jimmy
    • julie
    • linda
    • michael
    • frank
    • adam
    • sandra
    • john
    • josh
    • alex
    • michael
    • james
    • mike
    • kevin
    • david
    • george
    • sam
    • andrew
    • jose
    • leo
    • maria
    • jim
    • brian

      The worm may also spoof a From address from one of the addresses found on the compromised computer.

      Subject:
      One of the following:

    • Your password has been updated
    • Your password has been successfully updated
    • You have successfully updated your password
    • Your new account password is approved
    • Your Account is Suspended
    • *DETECTED* Online User Violation
    • Your Account is Suspended For Security Reasons
    • Warning Message: Your services near to be closed.
    • Important Notification
    • Members Support
    • Security measures
    • Email Account Suspension
    • Notice of account limitation

      Message:
      One of the following:

    • Dear user [USER NAME],
      You have successfully [REMOVED]
      +++ [DOMAIN] Antivirus - www.[FULL DOMAIN]
    • Dear user [USER NAME],
      It has come to our attention [REMOVED]
      +++ [DOMAIN] Antivirus - www.[FULL DOMAIN]
    • Dear [DOMAIN] Member,
      We have temporarily [REMOVED]
      +++ [DOMAIN] Antivirus - www.[FULL DOMAIN]
    • Dear [DOMAIN] Member,
      Your e-mail account [REMOVED]
      +++ [DOMAIN] Antivirus - www.[FULL DOMAIN]

      Note: [DOMAIN] is the domain part of the recipient's email address, [USER NAME] is the username part of the recipient's email address, [SPOOFED EMAIL] is a spoofed email address on the same domain, and [EMAIL] is the recipient's email address.


      Attachment:
      One of the following:

    • updated-password
    • email-password
    • new-password
    • password
    • approved-password
    • account-password
    • accepted-password
    • important-details
    • account-details
    • email-details
    • account-info
    • document
    • readme
    • account-report

      with one of the following extensions:

    • .cmd
    • .bat
    • .pif
    • .scr
    • .exe

      The attachment may also be a .zip file containing a copy of the worm with two file extensions. The copy of the worm will have .doc, .htm, or .txt as the first extension, and .exe, .pif, or .scr as the second extension.

      Avoids sending itself to email addresses that contain any of the following strings:

    • your
    • you
    • bugs
    • rating
    • site
    • contact
    • soft
    • somebody
    • privacy
    • service
    • help
    • not
    • root
    • info
    • samples
    • postmaster
    • webmaster
    • noone
    • nobody
    • nothing
    • anyone
    • someone
    • submit
    • feste
    • gold-certs
    • the.bat
    • page
    • admin
    • icrosoft
    • support
    • ntivi
    • unix
    • bsd
    • linux
    • listserv
    • certific
    • google
    • accoun
    • spm
    • spam
    • www
    • secur
    • abuse
    • support
    • administrator
    • mail
    • service
    • admin
    • info
    • register
    • webmaster

      Avoids sending itself to email addresses that contain any of the following strings in the domain name:

    • panda
    • sopho
    • borlan
    • inpris
    • example
    • mydomai
    • nodomai
    • ruslis
    • .gov
    • avp
    • syma
    • icrosof
    • msn.
    • hotmail
    • gov.
    • .mil
    • foo.
    • berkeley
    • unix
    • math
    • bsd
    • mit.e
    • gnu
    • fsf.
    • ibm.com
    • google
    • kernel
    • linux
    • fido
    • usenet
    • iana
    • ietf
    • rfc-ed
    • sendmail
    • arin.
    • ripe.
    • isi.e
    • isc.o
    • secur
    • acketst
    • pgp
    • tanford.e
    • utgers.ed
    • mozilla

  8. Opens a back door by connecting to the forbs.tourettes.com.ar domain on TCP port 6667. The worm listens for commands that allow the remote attacker to perform any of the following actions:

    • Execute files
    • Download files
    • Perform other IRC commands determined by the attacker
    • Restart the compromised computer

  9. Blocks access to several security-related Web sites by appending the following text to the 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 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 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 pandasoftware.com
    127.0.0.1 www.pandasoftware.com
    127.0.0.1 www.trendmicro.com
    127.0.0.1 www.grisoft.com
    127.0.0.1 www.microsoft.com
    127.0.0.1 microsoft.com
    127.0.0.1 www.virustotal.com
    127.0.0.1 virustotal.com
    127.0.0.1 www.amazon.com
    127.0.0.1 www.amazon.co.uk
    127.0.0.1 www.amazon.ca
    127.0.0.1 www.amazon.fr
    127.0.0.1 www.paypal.com
    127.0.0.1 paypal.com
    127.0.0.1 moneybookers.com
    127.0.0.1 www.moneybookers.com
    127.0.0.1 www.ebay.com
    127.0.0.1 ebay.com

  10. Attempts to end the following processes, some of which may be security-related:

    • 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
    • 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
    • CFIAUDIT.EXE
    • CFINET.EXE
    • CFINET32.EXE
    • CLAW95CF.EXE
    • CLEAN.EXE
    • CLEANER.EXE
    • CLEANER3.EXE
    • CLEANPC.EXE
    • CLICK.EXE
    • CMD.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
    • ESCANHNT.EXE
    • ESCANV95.EXE
    • ESPWATCH.EXE
    • ETHEREAL.EXE
    • ETRUSTCIPE.EXE
    • EVPN.EXE
    • EXANTIVIRUS-CNET.EXE
    • EXE.AVXW.EXE
    • EXPERT.EXE
    • EXPLORE.EXE
    • F-PROT.EXE
    • F-PROT95.EXE
    • F-STOPW.EXE
    • FAMEH32.EXE
    • FAST.EXE
    • FCH32.EXE
    • FIH32.EXE
    • FINDVIRU.EXE
    • FIREWALL.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
    • HOTACTIO.EXE
    • HOTPATCH.EXE
    • HTLOG.EXE
    • HTPATCH.EXE
    • HWPE.EXE
    • HXDL.EXE
    • HXIUL.EXE
    • IAMAPP.EXE
    • IAMSERV.EXE
    • IAMSTATS.EXE
    • IBMASN.EXE
    • IBMAVSP.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
    • 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
    • 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
    • NAVLU32.EXE
    • NAVNT.EXE
    • NAVSTUB.EXE
    • NAVW32.EXE
    • NAVWNT.EXE
    • NC2000.EXE
    • NCINST4.EXE
    • NDD32.EXE
    • NEC.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
    • 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
    • OUTPOST.EXE
    • OUTPOSTINSTALL.EXE
    • OUTPOSTPROINSTALL.EXE
    • PADMIN.EXE
    • PANIXK.EXE
    • PATCH.EXE
    • PAVCL.EXE
    • PAVPROXY.EXE
    • PAVSCHED.EXE
    • PAVW.EXE
    • PCFWALLICON.EXE
    • PCIP10117_0.EXE
    • PCSCAN.EXE
    • PDSETUP.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
    • 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
    • SETUPVAMEEVAL.EXE
    • SETUP_FLOWPROTECTOR_US.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
    • SSGRATE.EXE
    • SSG_4104.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
    • TASKMGR.EXE
    • TASKMO.EXE
    • TASKMON.EXE
    • TAUMON.EXE
    • TBSCAN.EXE
    • TC.EXE
    • TCA.EXE
    • TCM.EXE
    • TDS-3.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
    • 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
    • _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


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: Hiroshi Shinotsuka

Discovered: June 16, 2005
Updated: February 13, 2007 12:40:38 PM
Also Known As: Win32.Mytob.FU [Computer Assoc, Net-Worm.Win32.Mytob.bi [Kaspe, W32/Mytob-BU [Sophos], WORM_MYTOB.FO [Trend Micro]
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. Remove all the entries that the risk added to the hosts file.
  3. Update the virus definitions.
  4. Run a full system scan and delete all the files detected.
  5. Delete any values added to the registry.
  6. Reenable the SharedAccess service (Windows 2000/XP only)
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:
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 remove all the entries that the risk added to the hosts file
  1. Navigate to the following location:

    • Windows 95/98/Me:
      %Windir%
    • Windows NT/2000/XP:
      %Windir%\System32\drivers\etc

      Notes:
    • The location of the hosts file may vary and some computers may not have this file. There may also be multiple copies of this file in different locations. If the file is not located in these folders, search your disk drives for the hosts file, and then complete the following steps for each instance found.
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  2. Double-click the hosts file.
  3. If necessary, deselect the "Always use this program to open this program" check box.
  4. Scroll through the list of programs and double-click Notepad.
  5. When the file opens, delete all the entries added by the risk. (See the Technical Details section for a complete list of entries.)
  6. Close Notepad and save your changes when prompted.

3. 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 document: 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 the document: 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.


4. 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, click Delete.

Important: If your Symantec antivirus product reports that it cannot delete a detected file, Windows may be using the file. To fix 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.


5. 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_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices

  5. In the right pane, delete the value:

    "WINDOWS SYSTEM Dns" = "windsns.exe"

  6. Exit the Registry Editor.

6. To reenable the SharedAccess service (Windows 2000/XP only)
The SharedAccess service is responsible for maintaining Internet Connection Sharing and the Windows Firewall/Internet Connection Firewall applications in Windows. (The presence and names of these applications vary depending on the operating system and service pack you are using.) To protect your computer and maintain network functionality, re-enable this service if you are using any of these programs.


Windows XP Service Pack 2
If you are running Windows XP with Service Pack 2 and are using the Windows Firewall, the operating system will alert you when the SharedAccess service is stopped, by displaying an alert balloon saying that your Firewall status is unknown. Perform the following steps to ensure that the Windows Firewall is re-enabled:
  1. Click Start > Control Panel.

  2. Double-click the Security Center.

  3. Ensure that the Firewall security essential is marked ON.

    Note: If the Firewall security essential is marked on, your Windows Firewall is on and you do not need to continue with these steps.

    If the Firewall security essential is not marked on, click the "Recommendations" button.

  4. Under "Recommendations," click Enable Now. A window appears telling you that the Windows Firewall was successfully turned on.

  5. Click Close, and then click OK.

  6. Close the Security Center.


Windows 2000 or Windows XP Service Pack 1 or earlier
Complete the following steps to re-enable the SharedAccess service:
  1. Click Start > Run.
  2. Type services.msc

    Then click OK.

  3. Do one of the following:
    • Windows 2000: Under the Name column, locate the "Internet Connection Sharing (ICS)" service and double-click it.
    • Windows XP: Under the Named column, locate the "Internet Connection Firewall (ICF) / Internet Connection Sharing (ICS)" service and double-click it.

  4. Under "Startup Type:", select "Automatic" from the drop-down menu.

  5. Under "Service Status:", click the Start button.

  6. Once the service has completed starting, click OK.

  7. Close the Services window.


Writeup By: Hiroshi Shinotsuka