Backdoor:Win32/Mydoom.gen

Backdoor:Win32/Mydoom.gen is a generic detection for a family of backdoor Trojans that connect to an Internet Relay Chat (IRC) Server, and await IRC commands issued by a remote attacker. Commands sent from an attacker for the Trojan to perform could include downloading and executing files, collecting sensitive data, and performing spam runs. Other variants of the Mydoom family are worms that send a copy of the worm to gathered e-mail addresses, from the infected computer. 

 

While functionally similar, there may be slight differences between minor variants detected as Backdoor:Win32/Mydoom.gen. Please see below for a detailed example analysis of one variant detected as Backdoor:Win32/Mydoom.gen.

 

If Backdoor:Win32/Mydoom.gen is run, it writes a copy of itself into the <system folder> as "IEAutoConfig.exe". Next, it adds a registry key with value to load the Trojan at next Windows startup:

Adds value with data: "Internet Explorer" = "IEAutoConfig.exe"

To subkeys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

 

E-mail

This malware can be ordered to send itself to other users via SMTP e-mail. Messages are created from a list of possible subject lines, and file attachment names. The drive is scanned for e-mail addresses within files with extensions wab, pl, adb, tbb, db, asp, php, sht and htm, creating a recipient target list for the crafted message.

 

The list of targets is further reduced by eliminating addresses containing these strings in the address:

accoun  certific    listserv    ntivi   support icrosoft    admin   page    the.bat gold-certs  ca  feste   submit  not help    service privacy somebody    no  soft    contact site    rating  bugs   me  you your    someone anyone  nothing nobody  noone

webmaster   postmaster  samples info    root    mozilla utgers.ed   tanford.e   pgp acketst secur   isc.o   isi.e   ripe.   arin.   sendmail    rfc-ed  ietf    iana    usenet  fido    linux   kernel  google  ibm.com fsf.    gnu mit.e   bsd math    unix    berkeley

 

 

Subject (one of these):	RE: hey, how are ya? RE: long time no see!   RE: hey, hows it going?  RE: Your details RE: You have been approved Urgent Announcement Important Announcement Hey, congratulations!
Body text (one of these):	This is a multi-part message in MIME format. See attached document for details.
	This is a multi-part message in MIME format. Please see attached document for more information.
	This message could not be displayed. It has been attached to this email instead.
	Please open the attached document. It contains important information.
Attached file, in one of these formats: filename.%A.%B filename.%B filename.zip	File name	optional ext. %A	extension %B
	Readme  UrgentInfo  Details New_Message New_Document <random characters>	.doc .txt .htm .tmp	.exe  .scr .pif

 

Exploit

This malware may try to send itself to other users through a network, invoking exploits against services to attack targeted computers. Mydoom may try to connect to randomly picked IP addresses, and invoke a remote RPC buffer overflow attack to execute code, and install itself to remote computers. This vulnerability is addressed by Microsoft Security Bulletin MS03-026, released in March 2003.

 

Backdoor Functionality

Backdoor:Win32/Mydoom.gen supports a variety of commands that can be received from a remote attacker. Most notable are the ability to be perform the following actions:

Process Termination

This Trojan may terminate some critical or security-related processes, using a list to compare names or running processes. The following list are processes and services targeted for termination by the Trojan:

 

ACKWIN32.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

 

Domain Name Redirection

This Trojan may modify the local 'hosts' file, a configuration file that aids in Domain Name Resolution. The purpose of such a modification is to prevent the user from connecting to various security-related Web sites, including the following:

 

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 pandasoftware.com www.pandasoftware.com www.trendmicro.com www.grisoft.com www.microsoft.com microsoft.com www.virustotal.com virustotal.com www.amazon.com www.amazon.co.uk www.amazon.ca www.amazon.fr www.paypal.com paypal.com moneybookers.com www.moneybookers.com www.ebay.com ebay.com

 

Disables Windows Firewall

Alters Windows Firewall / Internet Connection Sharing (ICS) settings via a registry value change:

 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess 

old value: Start = 0x00000003

new value: Start = 0x00000004