WORM_SDBOT.COU

Malware type: Worm

Aliases: Backdoor.Win32.SdBot.yx (Kaspersky), W32/Sdbot.worm.gen.bs (McAfee), W32.Spybot.Worm (Symantec), TR/Crypt.ULPM.Gen (Avira), W32/Sdbot-Fam (Sophos), Backdoor:Win32/Sdbot (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Infection Channel 1 : Propagates via network shares


Infection Channel 2 : Propagates via software vulnerabilities


Description: 

This memory-resident worm propagates by generating IP addresses and dropping copies of itself into network shares. It also takes advantage of the Windows RPC DCOM vulnerability to spread across networks. For more information on the said vulnerability, refer to the following Microsoft Web page:

It also has backdoor capabilities. It opens a random TCP port, allowing a remote user to access and perform malicious commands on an affected machine. The said routine provides remote users virtual control over affected systems, thus compromising system security.

This worm has the ability to terminate processes running on the affected system. Most of these processes are related to antivirus and security applications.

This worm is also capable of preventing affected users from accessing certain antivirus Web sites by adding entries in the system's HOSTS file.

These routines may make it difficult for affected users to detect and remove this worm from the system. This may also pose as an additional threat to the affected system by making it vulnerable to further attacks from other malware programs.

For additional information about this threat, see:

Description created: Nov. 7, 2005 11:21:16 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 74,240 Bytes

Ports used: Random TCP ports

Initial samples received on: Nov 7, 2005

Compression type: UPX

Vulnerability used:  (MS03-026) Buffer Overrun In RPC Interface Could Allow Code Execution

Payload 1: Compromises system security

Payload 2: Terminates processes

Payload 3: May attempt to modify HOSTS file

Payload 4: Lowers firewall setting to allow its execution

Details:

Installation and Autostart Technique

Upon execution, this memory-resident worm drops a copy of itself in the Windows folder as MSCONFIG16.EXE, with attributes set to Hidden, Read-only, and System to avoid easy detection.

It then creates the following registry entries to ensure its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
Intel Service Drivers = "msconfig16.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\RunServices
Intel Service Drivers = "msconfig16.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Run
Intel Service Drivers = "msconfig16.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\RunServices
Intel Service Drivers = "msconfig16.exe"

It also adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Control\Lsa
Intel Service Drivers = "msconfig16.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Lsa
Intel Service Drivers = "msconfig16.exe"

HKEY_CURRENT_USER\Software\Microsoft\OLE
Intel Service Drivers = "msconfig16.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
Intel Service Drivers = "msconfig16.exe"

It modifies registry entries, as follows:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
EnableDCOM = "N"

(Note: The default value value data for this entry is "Y".)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous = "dword:00000001"

(Note: The value for this registry entry is user-defined.)

In addition, it adds the following registry entry to lower the firewall setting, hence allowing its execution:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
SharedAccess\Parameters\FirewallPolicy\StandardProfile\
PriorizedApplications\List
%Windows%\msconfig16.exe = "%Windows%\msconfig16.exe:*:Enabled:msconfig16"

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Network Propagation and Exploit

This worm propagates by generating IP addresses and dropping copies of itself into the following default network shares:

  • ADMIN$
  • C$
  • D$
  • IPC$

It also takes advantage of the Windows RPC DCOM vulnerability to spread across networks. For more information on the said vulnerability, refer to the following Microsoft Web page:

Backdoor Capabilities

This worm acts as a server program controlled by an Internet Relay Chat (IRC) bot. It opens a random TCP port and connects to an IRC server. It then joins an IRC channel.

Once connected, this server program receives commands from the IRC bot. These commands are used to control the target system and the behavior of the server program. The commands it performs are as follows:

  • Enable or disable DCOM
  • Get system information
  • Launch denial of service attacks using the ICMP and SYN flooding methods
  • List and delete network shares
  • List and terminate processes
  • Perform IRC commands
  • Scan for open ports
  • Scan for vulnerabilities
  • Sniff incoming and outgoing packets
  • Start an FTP or HTTP server on the system

Process Termination

This worm terminates the following processes, most of which are related to antivirus and security applications:

  • _AVP32.EXE
  • _AVPCC.EXE
  • _AVPM.EXE
  • ANTI-TROJAN.EXE
  • ANTIVIRUS.EXE
  • ANTS.EXE
  • APIMONITOR.EXE
  • ARR.EXE
  • ATCON.EXE
  • ATGUARD.EXE
  • ATRO55EN.EXE
  • ATUPDATER.EXE
  • ATWATCH.EXE
  • AU.EXE
  • AUPDATE.EXE
  • AUTO-PROTECT.NAV80TRY.EXE
  • AUTODOWN.EXE
  • AUTOTRACE.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
  • AVSCHED32.EXE
  • AVSYNMGR.EXE
  • AVWIN95.EXE
  • AVWINNT.EXE
  • AVWUPD.EXE
  • AVWUPD32.EXE
  • AVWUPSRV.EXE
  • AVXMONITOR9X.EXE
  • AVXMONITORNT.EXE
  • AVXQUAR.EXE
  • BACKWEB.EXE
  • BAGLE.V
  • BARGAINS.EXE
  • BD_PROFESSIONAL.EXE
  • BDSS.EXE
  • BDSWITCH.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
  • CFINET.EXE
  • CFINET32.EXE
  • CLAW95.EXE
  • CLAW95CF.EXE
  • CLEAN.EXE
  • CLEANER.EXE
  • CLEANER3.EXE
  • CLEANPC.EXE
  • CLICK.EXE
  • CMD.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
  • 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
  • ESCANH95.EXE
  • ESCANHNT.EXE
  • ESCANV95.EXE
  • ESPWATCH.EXE
  • ETHEREAL.EXE
  • ETRUSTCIPE.EXE
  • EVPN.EXE
  • EXANTIVIRUS-CNET.EXE
  • EXE.AVXW.EXE
  • EXPERT.EXE
  • EXPLORE.EXE
  • F-AGNT95.EXE
  • F-AGOBOT.EXE
  • F-PROT.EXE
  • F-PROT95.EXE
  • F-STOPW.EXE
  • FAMEH32.EXE
  • FAST.EXE
  • FCH32.EXE
  • FIH32.EXE
  • FINDVIRU.EXE
  • FIREWALL.EXE
  • FLOWPROTECTOR.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
  • HIJACKTHIS.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
  • ICLOAD95.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
  • IPARMOR.EXE
  • IRIS.EXE
  • ISASS.EXE
  • ISRV95.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
  • LUAU.EXE
  • LUCOMSERVER.EXE
  • LUINIT.EXE
  • LUSPT.EXE
  • MAPISVC32.EXE
  • MCAGENT.EXE
  • MCMNHDLR.EXE
  • MCSHIELD.EXE
  • MCTOOL.EXE
  • MCUPDATE.EXE
  • MCVSRTE.EXE
  • MCVSSHLD.EXE
  • MD.EXE
  • MFIN32.EXE
  • MFW2EN.EXE
  • MFWENG3.02D30.EXE
  • MGAVRTCL.EXE
  • MGAVRTE.EXE
  • MGHTML.EXE
  • MGUI.EXE
  • MICROSOFT INET XP..
  • 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
  • MSCVB32.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
  • MYDOOM.H
  • N32SCANW.EXE
  • NAV.EXE
  • NAVAP.NAVAPSVC.EXE
  • NAVAPSVC.EXE
  • NAVAPW32.EXE
  • NAVDX.EXE
  • NAVENGNAVEX15.NAVLU32.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
  • NETSKY.R
  • 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
  • NVARCH16.EXE
  • NVC95.EXE
  • NVSVC32.EXE
  • NWINST4.EXE
  • NWSERVICE.EXE
  • NWTOOL16.EXE
  • OLLYDBG.EXE
  • ONSRVR.EXE
  • OPTIMIZE.EXE
  • OSTRONET.EXE
  • OTFIX.EXE
  • OUTPOST.EXE
  • OUTPOSTINSTALL.EXE
  • OUTPOSTPROINSTALL.EXE
  • PADMIN.EXE
  • PANDAAVENGINE
  • PANDAAVENGINE.EXE
  • PANIXK.EXE
  • PATCH.EXE
  • PAVCL.EXE
  • PAVPROXY.EXE
  • PAVSCHED.EXE
  • PAVW.EXE
  • PCC2002S902.EXE
  • PCC2K_76_1436.EXE
  • PCCIOMON.EXE
  • PCCNTMON.EXE
  • PCCWIN97.EXE
  • PCCWIN98.EXE
  • PCDSETUP.EXE
  • PCFWALLICON.EXE
  • PCIP10117_0.EXE
  • PCSCAN.EXE
  • PDSETUP.EXE
  • PENIS.EXE
  • PENIS32.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
  • PUSSY.EXE
  • PVIEW95.EXE
  • QCONSOLE.EXE
  • QSERVER.EXE
  • RAPAPP.EXE
  • RAV.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
  • SCAN.EXE
  • SCAN32.EXE
  • SCAN95.EXE
  • SCANPM.EXE
  • SCRSCAN.EXE
  • SCRSVR.EXE
  • SCVHOST.EXE
  • SD.EXE
  • SERV95.EXE
  • SERVICE.EXE
  • SERVLCE.EXE
  • SERVLCES.EXE
  • SETUP_FLOWPROTECTOR_US.EXE
  • SETUPVAMEEVAL.EXE
  • SFC.EXE
  • SGSSFW32.EXE
  • SH.EXE
  • SHELLSPYINSTALL.EXE
  • SHN.EXE
  • SHOWBEHIND.EXE
  • SMC.EXE
  • SMS.EXE
  • SMSS32.EXE
  • SOAP.EXE
  • SOBIG.C
  • SOFI.EXE
  • SPERM.EXE
  • SPF.EXE
  • SPHINX.EXE
  • SPOLER.EXE
  • SPOOLCV.EXE
  • SPOOLSV32.EXE
  • SPYXX.EXE
  • SREXE.EXE
  • SRNG.EXE
  • SS3EDIT.EXE
  • SSG_4104.EXE
  • SSGRATE.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
  • SYSINFO.EXE
  • SYSTEM MSCVB
  • SYSTEM.EXE
  • SYSTEM32.EXE
  • SYSUPD.EXE
  • TASKMG.EXE
  • TASKMGR.EXE
  • TASKMO.EXE
  • TASKMON
  • TASKMON.EXE
  • TAUMON.EXE
  • TBSCAN.EXE
  • TC.EXE
  • TCA.EXE
  • TCM.EXE
  • TDS-3.EXE
  • TDS2-98.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
  • 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
  • W32.BLASTER
  • W32.BLASTER.B
  • W32.BLASTER.C
  • W32DSM89.EXE
  • W9X.EXE
  • WATCHDOG.EXE
  • WEBDAV.EXE
  • WEBSCANX.EXE
  • WEBTRAP.EXE
  • WFINDV32.EXE
  • WGFE95.EXE
  • WHOSWATCHINGME.EXE
  • WIMMUN32.EXE
  • WIN-BUGSFIX.EXE
  • WIN32.EXE
  • WIN32US.EXE
  • WINACTIVE.EXE
  • WINDOW.EXE
  • WINDOWS AUTO UPDATE
  • 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

HOSTS File Modification

This worm may attempt to modify the system's HOSTS file, which contains host name to IP address mappings. The said file can be found in the following folder:

    %System%\drivers\etc

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32 on Windows XP and Server 2003.)

It may append a list of Web sites to direct connection to the loopback address (127.0.0.1). The said routine is done so that the following sites, which are usually related to antivirus companies, can no longer be accessed by affected users:

  • avp.com
  • ca.com
  • customer.symantec.com
  • dispatch.mcafee.com
  • download.mcafee.com
  • f-secure.com
  • kaspersky.com
  • liveupdate.symantec.com
  • liveupdate.symantecliveupdate.com
  • mast.mcafee.com
  • mcafee.com
  • my-etrust.com
  • nai.com
  • networkassociates.com
  • rads.mcafee.com
  • secure.nai.com
  • securityresponse.symantec.com
  • sophos.com
  • symantec.com
  • trendmicro.com
  • update.symantec.com
  • updates.symantec.com
  • us.mcafee.com
  • viruslist.com
  • www.avp.com
  • www.ca.com
  • www.f-secure.com
  • www.kaspersky.com
  • www.mcafee.com
  • www.my-etrust.com
  • www.nai.com
  • www.networkassociates.com
  • www.sophos.com
  • www.symantec.com
  • www.trendmicro.com
  • www.viruslist.com

Other Details

This worm runs on Windows XP and Server 2003.

Analysis By: Elyzah Blue Asodisen

Updated By: Roy Dexter Dollentas Jimenez

Revision History:

 
Nov 08, 2005 - Modified Virus Report
Nov 12, 2005 - Modified Virus Report
Nov 13, 2005 - Modified Virus Report

SOLUTION


Minimum scan engine version needed: 7.000

Pattern file needed: 2.934.04

Pattern release date: Nov 8, 2005


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Terminating the Malware Program

Since this malware terminates the Windows Task Manager, it is necessary to use third party process viewers such as Process Explorer.

If the process you are looking for is not in the list displayed by Process Explorer, proceed to the succeeding solution set.

  1. Download Process Explorer.
  2. Extract the contents of the compressed (ZIP) file to a location of your choice.
  3. Execute Process Explorer by double-clicking procexp.exe.
  4. In the Process Explorer window, locate the process:
    MSCONFIG16.EXE
  5. Right-click the malware process, then click Kill Process Tree.
  6. Close Process Explorer.

Editing the Registry

This malware modifies the system's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  6. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Run
  7. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  8. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  9. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"

Removing Added Entries from the Registry

  1. Still in the Registry Editor, in the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Ole
  2. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  3. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>
    Control>Lsa
  4. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  5. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>OLE
  6. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  7. In the left panel, double-click the following:
    HKEY_CURRENT_USER>SYSTEM>CurrentControlSet>
    Control>Lsa
  8. In the right panel, locate and delete the entry:
    Intel Service Drivers = "msconfig16.exe"
  9. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>
    SharedAccess>Parameters>FirewallPolicy>StandardProfile>
    PriorizedApplications>List
  10. In the right panel, locate and delete the entry:
    %Windows%\msconfig16.exe = "%Windows%\msconfig16.exe:*:Enabled:msconfig16"
    (Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Restoring EnableDCOM and RestrictAnonymous Registry Entries

This malware modifies EnableDCOM and RestrictAnonymous registry entries to a certain value. To know more about restoring these registries to their original values, please refer to these articles:

  1. COM security frequently asked questions
  2. How to disable DCOM support in Windows
  3. How to Use the RestrictAnonymous Registry Value in Windows 2000
  4. The "RestrictAnonymous" Registry Value May Break the Trust to a Windows 2000 Domain

To restore this entry to its default value, please perform the following instructions:

  1. Again in the Registry Editor, in the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Ole
  2. In the right panel, locate the entry:
    EnableDCOM = "N"
  3. Right-click on this registry entry and choose Modify. Change the value of this entry to:
    EnableDCOM = "Y"
  4. Close Registry Editor.

Removing Malware Entries from the HOSTS File

Deleting malware entries from the HOSTS file removes all malware-made changes on host name association.

  1. Open the following file using a text editor (such as NOTEPAD):
      %System%\drivers\etc\HOSTS
    (Note: %System% is the Windows system folder, which is usually C:\Windows\System32 on Windows XP and Server 2003.)
  2. Delete the following entries:
    • 127.0.0.1 www.trendmicro.com
    • 127.0.0.1 trendmicro.com
    • 127.0.0.1 rads.mcafee.com
    • 127.0.0.1 customer.symantec.com
    • 127.0.0.1 liveupdate.symantec.com
    • 127.0.0.1 us.mcafee.com
    • 127.0.0.1 updates.symantec.com
    • 127.0.0.1 update.symantec.com
    • 127.0.0.1 www.nai.com
    • 127.0.0.1 nai.com
    • 127.0.0.1 secure.nai.com
    • 127.0.0.1 dispatch.mcafee.com
    • 127.0.0.1 download.mcafee.com
    • 127.0.0.1 www.my-etrust.com
    • 127.0.0.1 my-etrust.com
    • 127.0.0.1 mast.mcafee.com
    • 127.0.0.1 ca.com
    • 127.0.0.1 www.ca.com
    • 127.0.0.1 networkassociates.com
    • 127.0.0.1 www.networkassociates.com
    • 127.0.0.1 avp.com
    • 127.0.0.1 www.kaspersky.com
    • 127.0.0.1 www.avp.com
    • 127.0.0.1 kaspersky.com
    • 127.0.0.1 www.f-secure.com
    • 127.0.0.1 f-secure.com
    • 127.0.0.1 viruslist.com
    • 127.0.0.1 www.viruslist.com
    • 127.0.0.1 liveupdate.symantecliveupdate.com
    • 127.0.0.1 mcafee.com
    • 127.0.0.1 www.mcafee.com
    • 127.0.0.1 sophos.com
    • 127.0.0.1 www.sophos.com
    • 127.0.0.1 symantec.com
    • 127.0.0.1 securityresponse.symantec.com
    • 127.0.0.1 www.symantec.com
  3. Save the file and close the text editor.

Important Windows XP Cleaning Instructions

Users running Windows XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure set(s).

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete files detected as WORM_SDBOT.COU. To do this, Trend Micro customers must download the latest virus pattern file and scan their system. Other Internet users can use HouseCall, the Trend Micro online virus scanner.

Applying Patch

This malware exploits a known vulnerability in Windows. Download and install the fix patch supplied by Microsoft. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.

(Note: The patch link indicated above points to MS03-039, which contains the updated patch for MS03-026.)




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