Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Win32/Mytob.LQ

   
Aliases: W32/Mydoom-gen (Sophos), Win32.Worm.Mytob.gen (Bitdefender), Net-Worm.Win32.Mytob.bi (Kaspersky)
Type: Mass-mailing E-mail worm
Systems Affected: 32-Bit Windows

Introduction:

Mytob.LQ is an approximately 118784 byte PECrypt runtime protected typical mass-mailing e-mail worm.

Installation and Autostart Techniques:

Upon execution, the worm copies itself into the System32 folder as "mshotmon.exe".

The worm adds the following registry keys to ensure that it runs every time windows is started:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
"Microsoft Hotmail Monitor" = "mshotmon.exe"

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
"Microsoft Hotmail Monitor" = "mshotmon.exe"

The worm continuously checks for the presence of these registry keys and recreates them if they are no longer present.

Mytob.LQ modifies also the following registry key:

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
"Start" = "4"

in order to lower security settings on the compromised system. This will disable the shared access on Windows 2000 and Windows XP systems.

To lower the default Internet Explorer security settings Mytob.LQ will modify several registry keys at:

HKCU\ SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3

The worm terminates several programs:

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 IRUSMDPERSONALFIREWALL.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

E-mail Harvesting:

The worm scans all fixed disks and is designed to collect e-mail addresses from files with one of the following file extensions:

*.wab, *.adb, *.tbb, *.dbx, *.asp, *.php, *.sht, *.htm, *.pl, *.txt, *.xml, *.cgi, *.jsp

Due to a bug in the implementation of stringcat with the WIN32_FIND_DATA results the worm will open files that have extentions with partial matches. The worm will always open and scan a file for e-mail addresses when at least one character matches one of the characters in the file extension list in the correct order.

In technical terms, that means the worm compares the file extension via 'instring function/substring function'.

Example:

The worm will search for e-mail addresses in files where the file extension matches
*.htm, *.ht, *.h.

Mytob.LQ also collects e-mail addresses from the Windows Address Book and from the following folders:

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

DNS Resolving:

Mytob.LQ performs DNS e-mail-exchange-queries to find an appropriate mail server for each domain it tries to send itself to. If this DNS request for the mail server fails, the worm tries to guess the e-mail server by adding the domain name in front of the following prefixes:

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

E-mail Sender:

Mytob.LQ generates the sender's e-mail addresses using the following list of names:

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

The worm might also use a spoofed email address collected during E-mail harvesting.

Mytob.LQ uses its own SMTP (Simple Mail Transfer Protocol) engine to mass-mail copies of itself to other e-mail addresses.

E-mail Subjects:

Mytob.LQ randomly selects an e-mail subject from the following list, combined with "Notice", "Warning", and other prefix strings:

Notice of account limitation
Email Account Suspension
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

The E-mail subjects are rot-13 encrypted and stored in the worm.

Message Body:

The e-mail contains one of the following message texts:

Dear user {Name},

You have successfully updated the password of your {domainname} account.

If you did not authorize this change or if you need assistance with your account, please contact {domainname} customer service at: {email@domainname}

Thank you for using {domainname}!
The {domainname} Support Team

+++ Attachment: No Virus (Clean)
+++ {domainname} Antivirus - www.{domainname}

Dear user {Name},

It has come to our attention that your {domainname} User Profile {Number} records are out of date.
For further details see the attached document.
Thank you for using {domainname}!
The {domainname} Support Team

+++ Attachment: No Virus (Clean)
+++ {domainname} Antivirus - www.{domainname}

Dear {domainname} Member,

We have temporarily suspended your email account {YourEmailAddress}.

This might be due to either of the following reasons:

1. A recent change in your personal information (i.e. change of address).
2. Submiting invalid information during the initial sign up process.
3. An innability to accurately verify your selected option of subscription due to an internal error within our processors.
See the details to reactivate your {domainname} account.

Sincerely, The {domainname} Support Team

+++ Attachment: No Virus (Clean)
+++ {domainname} Antivirus - www.{domainname}

Dear {domainname} Member,

Your e-mail account was used to send a huge amount of unsolicited spam messages during the recent week. If you could please take 5-10 minutes out of your online experience and confirm the attached document so you will not run into any future problems with the online service. If you choose to ignore our request, you leave us no choice but to cancel your membership.

Virtually yours,
The {domainname} Support Team

+++ Attachment: No Virus found
+++ {domainname} Antivirus - www.{domainname}

Myton.LQ may also send e-mails containing a blank message body or random strings.

E-mail Attachments:

Mytob.LQ attaches a copy of itself using one of the following file names:

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

Random characters might also be used in the name of the attachment with one of the following file extensions:

bat
cmd
exe
scr
pif
zip

The worm may also attach itself as a ZIP file. The file inside the ZIP archive may have two extensions, the first chosen from the following list:

htm
txt
doc

The second extension is chosen from the following list and is separated from the first extension by a large number of spaces to hide the executable file extension:

pif
scr
exe

Example: The attachment "readme.zip" may contain the file "readme.txt { spaces }.scr"

The worm avoids e-mail addresses which contain parts of the following list:

.gov, .mil, abuse, accoun, acketst, admin, anyone, arin., avp, be_loyal:, berkeley,
borlan, bsd, bugs, certific, contact, example, fcnz, feste, fido, foo., fsf., gnu, gold-certs,
google, gov., help, hotmail, iana, ibm.com, icrosof, icrosoft, ietf, info, inpris, isc.o,
isi.e, kernel, linux, listserv, math, mit.e, mozilla, msn., mydomai, nobody, nodomai,
noone, not, nothing, ntivi, page, panda, pgp, postmaster, privacy, rating, rfc-ed, ripe.,
root, ruslis, samples, secur, sendmail, service, site, soft, somebody, someone, sopho,
spm, submit, support, syma, tanford.e, the.bat, unix, usenet, utgers.ed, webmaster,
www, you, your, -._!, -._!@

Both "Microsoft" as well as "microsoft" will be matched with the string "icrosoft".

Hostfile Manipulation:

Mytob.LQ overwrites the present hosts file with the following data to avoid accessing these sites:

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

Other Details:

The worm also provides IRC-Backdoor functionality with the following functions:

Downloading files
Downloading new worm updates
Executing files
Providing uptime information to the remote controller
Providing information about the worm variant to the remote controller
Notifying IRC Channels/Operator via private message
Restarting the computer
Providing FTP Server Access on the compromised system
Removing components

Mytob.LQ tries to connect to the irc server ilikeboys.yi.org (port 43287 TCP/IP).
It tries to join the channel "#ilikeboys".

History: Analysis and Write-up by: Michael St. Neitzel