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Virus:Worm/Mytob.DX
Date discovered:27/05/2005
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:49.790 Bytes
MD5 checksum:0C9fcf5dbcba53d289ccbfdb1c627e6f
VDF version:6.30.00.207

 General Method of propagation:
   • Email


Aliases:
   •  Symantec: W32.Mydoom.BU@mm
   •  Kaspersky: Net-Worm.Win32.Mytob.az
   •  TrendMicro: WORM_MYTOB.FC
   •  F-Secure: W32/Mytob.DW@mm
   •  Grisoft: I-Worm/Mytob.FR
   •  VirusBuster: I-Worm.Mytob.DU
   •  Bitdefender: Win32.Worm.Mytob.AZ


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows XP
   • Windows 2003


Side effects:
   • Blocks access to security websites
   • Disable security applications
   • Uses its own Email engine
   • Lowers security settings
   • Registry modification
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\nec.exe



The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
   • %TEMPDIR%\tmp%hex number%.tmp

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • WINDOWS SYSTEM = nec.exe

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • WINDOWS SYSTEM = nec.exe



The following registry key is changed:

Deactivate Windows Firewall:
– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess]
   Old value:
   • Start = %user defined settings%
   New value:
   • Start = dword:00000004

 Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:


From:
The sender of the email is one of the following:
   • support@%recipient's domain%
   • administrator@%recipient's domain%
   • mail@%recipient's domain%
   • service@%recipient's domain%
   • admin@%recipient's domain%
   • info@%recipient's domain%
   • register@%recipient's domain%
   • webmaster@%recipient's domain%


To:
– Email addresses found in specific files on the system.
– Generated addresses


Subject:
One of the following:
   • 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



Body:
–  In some cases it may contain random characters.
The body of the email is one of the lines:
   • "Once you have completed the form in the attached file , your account records will not be interrupted and will continue as normal."
   • The original message has been included as an attachment.
   • 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.


Attachment:
The filename of the attachment is one of the following:
   • email-info.zip
   • email-doc.zip
   • information.zip
   • account-details.zip
   • document.zip
   • INFO.zip
   • instructions.zip
   • info-text.zip
   • information.zip
   • %random character string%.zip

The attachment is an archive containing a copy of the malware itself.



The email may look like one of the following:



 Mailing Search addresses:
It searches the following files for email addresses:
   • txt; htm; sht; jsp; cgi; xml; php; asp; dbx; tbb; adb; wab


Address generation for TO field:
To generate addresses it uses the following strings:
   • john; alex; michael; james; mike; kevin; david; george; sam; andrew;
      jose; leo; maria; jim; brian; serg; mary; ray; tom; peter; robert;
      bob; jane; joe; dan; dave; matt; steve; smith; stan; bill; bob; jack;
      fred; ted; adam; brent; alice; anna; brenda; claudia; debby; helen;
      jerry; jimmy; julie; linda; sam

It combines the result with domains that were found in files, which were previously searched for addresses.


Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • 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; bugs; rating; site; contact; soft; somebody;
      privacy; service; help; not; submit; feste; gold-certs; the.bat; page;
      admin; icrosoft; support; ntivi; unix; bsd; linux; listserv; certific;
      google; accoun; spm; fcnz; www; secur; abuse


Prepend MX strings:
In order to get the IP address of the mail server it has the ability to prepend the following strings to the domain name:
   • mx.
   • mail.
   • smtp.
   • mx1.
   • mxs.
   • mail1.
   • relay.
   • ns.
   • gate.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: irc.black**********.net
Port: 6667
Channel: #skyline2
Nickname: [H311]%random character string%
Password: elite



– This malware has the ability to collect and send information such as:
    • Free memory
    • Malware uptime
    • Size of memory
    • Information about the Windows operating system


– Furthermore it has the ability to perform actions such as:
    • disconnect from IRC server
    • Download file
    • Execute file
    • Updates itself

 Hosts The host file is modified as explained:

– In this case already existing entries remain unmodified.

– Access to the following domains is effectively blocked:
   • 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




The modified host file will look like this:


 Process termination List of processes that are terminated:
   • 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


 Miscellaneous Mutex:
It creates the following Mutex:
   • X-B-T-3

 File details Programming language:
 The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Gherman on Friday, January 27, 2006
Description updated by Andrei Gherman on Friday, January 27, 2006

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