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Virus:Worm/Mytob.DF
Date discovered:17/05/2005
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:29.550 Bytes
MD5 checksum:194546a2190Bc75e55a5a5a0f2176049
VDF version:6.30.00.180

 General Method of propagation:
   • Email


Aliases:
   •  Symantec: W32.Mytob.CH@mm
   •  TrendMicro: WORM_MYTOB.ER
   •  Sophos: W32/Mytob-CJ
   •  Grisoft: I-Worm/Mytob.DC
   •  VirusBuster: I-Worm.Mytob.DA
   •  Eset: Win32/Mytob.CM
   •  Bitdefender: Win32.Worm.Mytob.AW


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP


Side effects:
   • Blocks access to security websites
   • Lowers security settings
   • Registry modification
   • Third party control

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

 Registry The following registry keys are continuously in an infinite loop added in order to run the processes after reboot.

  HKLM\Software\Microsoft\Windows\CurrentVersion\Run
   • "WINDOWS SKY" = "sky.exe"

  HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
   • "WINDOWS SKY" = "sky.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 address is spoofed.
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.


To:
– Email addresses found in specific files on the system.
 Email addresses gathered from WAB (Windows Address Book)
– Generated addresses


Subject:
One of the following:
   • Notice: **Last Warning**
   • SUSPENDED ACCOUNT
   • Your Email Account is Suspended For Security Reasons
   • Notice:***Your email account will be suspended***
   • Your Email Account Has been Blocked
   • *WARNING* Your Email Account Will Be Closed
   • Security measures
   • Email Account Suspension
   • *IMPORTANT* Please Validate Your Email Account
   • %random character string%



Body:
The body of the email is one of the following:

   • Once you have completed the form in the attached file , your account records will not be interrupted and will continue as normal.

   • We have temporarily limited access to sensitive account features. Please see the attached document for more information.

   • We have suspended some of your email services, to resolve the problem you should read the attached document.

   • To safeguard your email account from possible termination, Please follow the instructions in the attached file.

   • Account Information Are Attached!


Attachment:
The filename of the attachment is constructed out of the following:

–  It starts with one of the following:
   • email-info
   • email-doc
   • information
   • account-details
   • document
   • INFO
   • instructions
   • info-text

    The file extension is one of the following:
   • pif
   • scr
   • exe
   • cmd
   • bat
   • zip

The attachment is a copy of the malware itself.



The email looks like the following:


 Mailing Search addresses:
It searches the following files for email addresses:
   • adb; asp; cfg; cgi; dbx; ht; htm; html; jsp; mdb; msg; php; sht; tbb;
      txt; vbe; vbs; xml


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

To generate addresses it uses the following strings:
   • hostmaster
   • support
   • administrator
   • mail
   • service
   • admin
   • info
   • register
   • webmaster



Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • -._!; -._!@; .edu; .gov; .mil; abuse; accoun; acketst; admin; ahn;
      antivi; anyone; arin.; avp; be_loyal:; berkeley; borlan; bsd; bugs;
      certific; contact; duba; example; fbi; fcnz; feste; fido; foo.; f-pro;
      freeav; f-secur; fsf.; gnu; gold-certs; google; gov.; help; hotmail;
      iana; ibm.com; icrosof; icrosoft; ietf; info; inpris; isc.o; isi.e;
      jiangmin; kaspersky; kernel; linux; listserv; master; math; mcafee;
      messagelabs; mit.e; mozilla; msn.; mydomai; nobody; nodomai; noone;
      norman; norton; not; nothing; ntivi; page; panda; pgp; postmaster;
      privacy; rating; rfc-ed; ripe.; rising; root; ruslis; samples; sdbot;
      secur; sendmail; service; site; slashdot; soft; somebody; someone;
      sopho; sourceforge; spm; submit; support; syma; symantec; tanford.e;
      the.bat; unix; usenet; utgers.ed; viruslis; webmaster; www; you; your


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: 7000
Channel: #skyline
Nickname: [hell]%six-digit random character string%
Password: elite



 This malware has the ability to collect and send information such as:
    • CPU speed
    • Free disk space
    • Free memory
    • Malware uptime
    • Information about the network
    • Information about running processes
    • Size of memory
    • System directory
    • Information about the Windows operating system


 Furthermore it has the ability to perform actions such as:
    • Download file
    • Execute file
    • Send emails
    • Terminate malware
     Updates itself

 Hosts The host file is modified as explained:

In this case existing entries are deleted.

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;
      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.microsoft.com; www.trendmicro.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:
   • H-B-3

 File details In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • MEW

Descrizione inserita da Irina Boldea su venerdì 20 gennaio 2006
Descrizione aggiornata da Irina Boldea su venerdì 20 gennaio 2006

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