The Mytob.bf worm-backdoor appeared in the end of May - beginning of June 2005. It sends emails with an infected attachment and also contains an IRC-controlled backdoor. It is a close variant of Mytob.bd worm.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
The worm is a PE executable file 62464 bytes long, packed with UPX, PEncrypt and YodaProt file compressors.
When run, the worm creates a mutex with the name 'Lien-Van-de-Kelder'. Then it copies itself as 'www.lienvandekelder.be.exe' file to Windows System folder and creates a starup key for this file in the Registry:
[HKLM\Software\Microsoft\Windows\CurrentVersion\Run] "Lien Van de Kelder" = "www.lienvandekelder.be.exe" [HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices] "Lien Van de Kelder" = "www.lienvandekelder.be.exe"
The worm also modifies the following key value:
[HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess "Start" = dword:00000004
The worm has the capability to restore its file and startup keys in the Registry if they are modified or deleted.
To get the victims' email addresses the worm reads user's Address Book and also scans files with the following extensions on all hard disks and RAM drives:
txt htm sht jsp cgi xml php asp dbx tbb adb pl wab
The worm scans Internet Explorer cache folders and Windows System folder. The worm ignores email addresses with any of the following substrings:
avp syma icrosof msn. hotmail panda sopho borlan inpris example mydomai nodomai ruslis .gov 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 root info samples postmaster webmaster noone nobody nothing anyone someone your you me bugs rating site contact soft no somebody privacy service help not submit feste ca gold-certs the.bat page admin icrosoft support ntivi unix bsd linux listserv certific google accoun spm spam
The worm sends email messages with different subjects. Here's the list of subjects that the worm uses:
Notice: **Last Warning** *DETECTED* Online User Violation Your Email Account is Suspended For Security Reasons Account Alert Important Notification *WARNING* Your Email Account Will Be Closed Security measures Email Account Suspension Notice of account limitation
The message body can be empty, contain garbage or any of the following texts:
The original message has been included as an attachment. Once you have completed the form in the attached file , your account records will not be interrupted and will continue as normal. We regret to inform you that your account has been suspended due to the violation of our site policy, more info is attached. We attached some important information regarding your account. Please read the attached document and follow it's instructions.
The worm attaches itself to an infected message. The attachment is usually a ZIP archive with one of the following names:
email-info email-doc information account-details document INFO instructions info-text information
The worm's file located inside a ZIP archive has one of the above names and 2 extensions. The first extension is randomly selected from the following variants:
tmp doc htm txt
The second extension is randomly selected from the following variants:
pif scr exe cmd bat
The worm fakes the sender's email address. It is composed from the following user names:
support administrator mail service admin info register webmaster
and the recipient's email account domain name.
When the worm is active it tries to connect to the following IRC server and channel:
irc.blackcarder.net #Lien
If the connection is successful, the worm creates a bot in that channel. A hacker can send commands to a bot in order to control an infected computer. A hacker can do any of the following:
When the worm is active in memory it looks for and terminates processes with the following names:
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 ATUPDATER.EXE ATWATCH.EXE AU.EXE AUPDATE.EXE AUPDATE.EXE AUTODOWN.EXE AUTODOWN.EXE AUTOTRACE.EXE AUTOTRACE.EXE AUTOUPDATE.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 AVPUPD.EXE AVSCHED32.EXE AVSYNMGR.EXE AVWINNT.EXE AVWUPD.EXE AVWUPD32.EXE AVWUPD32.EXE AVWUPSRV.EXE AVXMONITOR9X.EXE AVXMONITORNT.EXE AVXQUAR.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 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 CLAW95CF.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 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 AUTO-PROTECT.NAV80TRY.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 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 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 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 CMD.EXE TASKMGR.EXE NEC.EXE
In addition the worm modifies HOSTS file to block access to the following websites:
www.symantec.com securityresponse.symantec.com symantec.com www.sophos.com sophos.com www.mcafee.com mcafee.com liveupdate.symantecliveupdate.com www.viruslist.com viruslist.com viruslist.com f-secure.com www.f-secure.com kaspersky.com kaspersky-labs.com www.avp.com www.kaspersky.com avp.com www.networkassociates.com networkassociates.com www.ca.com ca.com mast.mcafee.com my-etrust.com www.my-etrust.com download.mcafee.com dispatch.mcafee.com secure.nai.com nai.com www.nai.com update.symantec.com updates.symantec.com us.mcafee.com liveupdate.symantec.com customer.symantec.com rads.mcafee.com trendmicro.com www.trendmicro.com www.grisoft.com www.microsoft.com microsoft.com www.msn.com www.virustotal.com virustotal.com www.oxyd.fr oxyd.fr www.t35.com t35.com www.t35.net t35.net
The modified HOSTS file is detected as 'Trojan.Win32.Qhost.cb'.