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TROJ_DLOAD.SMAB

February 23, 2011
 Analysis by: Roland Dela Paz
 Modified by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be dropped by other malware. It arrives as a component bundled with malware/grayware/spyware packages.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DLL

File Compression:

UPX

Memory Resident:

No

Initial Samples Received Date:

12 Oct 2010

Payload:

Drops files

Arrival Details

This Trojan may be dropped by other malware.

It arrives as a component bundled with malware/grayware/spyware packages.

Installation

This Trojan adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Local\UIEI

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CLASSES_ROOT\PROTOCOLS\Filter\
text/html
(Default) = "Microsoft Improved HTML MIME Filter"

HKEY_CLASSES_ROOT\PROTOCOLS\Filter\
text/html
CLSID = "{random CLSID}"

HKEY_CLASSES_ROOT\CLSID\{random CLSID}\
InProcServer32
(Default) = "%User Temp%\mstmp."

HKEY_CLASSES_ROOT\CLSID\{random CLSID}\
InProcServer32
ThreadingModel = "Apartment"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\mstmp - detected as TROJ_DLOAD.SMAD

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan does the following:

  • It monitors the following security related services in the list of running processes in memory. If it finds any, its component file, TROJ_DLOAD.SMAD, disables the found service:
    • AAWService.exe
    • AAWTray.exe
    • ABregmon.exe
    • ACAAS.exe
    • ACAEGMr.exe
    • ACAIS.exe
    • ACALS.exe
    • ACASP.exe
    • ACenter.exe
    • AFMain.exe
    • AGB6.exe
    • AGBKrnl.exe
    • AGIDSUI.exe
    • ALMon.exe
    • ALive.exe
    • ALsvc.exe
    • APVXDWIN.EXE
    • ARCATA~1.EXE
    • AScheduleService.exe
    • AVGIDSAgent.exe
    • AVGIDSMonitor.exe
    • AVGIDSWatcher.exe
    • AVKProxy.exe
    • AVKService.exe
    • AVKTray.exe
    • AVKWCtl.exe
    • AVMenu.exe
    • Ad-Aware.exe
    • AhnSD.exe
    • AhnSDsv.exe
    • AluSchedulerSvc.exe
    • ApVxdWin.exe
    • ArcaBackupService.exe
    • ArcaBit.Core.Configurator2.exe
    • ArcaRemoteSvc.exe
    • Arcabit.Core.LoggingService.exe
    • BDTUpdateService.exe
    • CAGlobal.exe
    • CAGlobalLight.exe
    • CAPPActiveProtection.exe
    • CCSVCHST.EXE
    • CClaw.exe
    • CONSCTL.EXE
    • CounterSpy.exe
    • EMLPROUI.EXE
    • EMLPROXY.EXE
    • FAMEH32.exe
    • FCH32.EXE
    • FPAVServer.exe
    • FProtTray.exe
    • FSM32.EXE
    • FSMA32.EXE
    • FSMB32.exe
    • FileMonSV.exe
    • GDFirewallTray.exe
    • GDFwSvc.exe
    • GDSC.exe
    • GDScan.exe
    • HFACSvc.exe
    • HrRes.exe
    • IFace.exe
    • ISWSVC.exe
    • ITMRTSVC.exe
    • K7EmlPxy.exe
    • K7FWSrvc.exe
    • K7PSSrvc.exe
    • K7RTScan.exe
    • K7SysMon.exe
    • K7SysTry.exe
    • K7TSMngr.exe
    • K7TSecurity.exe
    • KVMonXp.kxp
    • KVSrvXP.exe
    • KVXp.kxp
    • MAILDISP.EXE
    • MSASCui.exe
    • MSProxy.ahn
    • MWAGENT.EXE
    • MWASER.EXE
    • McNASvc.exe
    • McProxy.exe
    • McSACore.exe
    • Mcshield.exe
    • MpfSrv.exe
    • MsMpEng.exe
    • Nbrowser.exe
    • NetMonSV.exe
    • Nip.exe
    • Njeeves.exe
    • Nsesvc.exe
    • Nvcoas.exe
    • ONLINENT.EXE
    • ONLNSVC.EXE
    • OPSSVC.EXE
    • OcHealthMon.exe
    • PAVSRV51.EXE
    • PPCtlPriv.exe
    • PSANHost.exe
    • PSHost.exe
    • PSUNMain.exe
    • PXAgent.exe
    • PXConsole.exe
    • PavBckPT.exe
    • PavFnSvr.exe
    • PavPrSrv.exe
    • PslmSvc.exe
    • QOELoader.exe
    • QUHLPSVC.EXE
    • RavMon.exe
    • RavTask.exe
    • RsTray.exe
    • SAVAdminService.exe
    • SBAMSvc.exe
    • SBAMTray.exe
    • SBCSSvc.exe
    • SBCSTray.exe
    • SCANMSG.EXE
    • SCANWSCS.EXE
    • SSU.exe
    • SavService.exe
    • SfCtlCom.exe
    • SpIDerAgent.exe
    • SpIDerMI.exe
    • SpySweeper.exe
    • SpySweeperUI.exe
    • SpybotSD.exe
    • TDWatch.exe
    • TFService.exe
    • THAV.EXE
    • THD32.EXE
    • THSM.EXE
    • TMBMSRV.exe
    • TRAYSSER.EXE
    • TRYICOS.EXE
    • TSCFCommander.exe
    • TSCFPlatformCOMSvr.exe
    • TeaTimer.exe
    • TmPfw.exe
    • TmProxy.exe
    • UPSCHD.EXE
    • UfNai.exe
    • UfSeAgnt.exe
    • UfSeAgnt.exe
    • UfUpdUi.exe
    • UmxAgent.exe
    • UmxCfg.exe
    • UmxFwHlp.exe
    • UmxPol.exe
    • VMwareService.exe
    • VMwareTray.exe
    • VMwareUser.exe
    • WEBPROXY.EXE
    • WRConsumerService.exe
    • WinSSUI.exe
    • Zanda.exe
    • Zlh.exe
    • a2guard.exe
    • a2services.exe
    • a2start.exe
    • acs.exe
    • arcarvir.exe
    • ashDisp.exe
    • ashMaiSv.exe
    • ashServ.exe
    • ashWebSv.exe
    • aswUpdSv.exe
    • avas.exe
    • avcom.exe
    • avesvc.exe
    • avgam.exe
    • avgamsvr.exe
    • avgas.exe
    • avgcc.exe
    • avgcsrvx.exe
    • avgcsrvx.exe
    • avgemc.exe
    • avgfws8.exe
    • avgnsx.exe
    • avgrsx.exe
    • avgtray.exe
    • avgui.exe
    • avgupd.exe
    • avgupsvc.exe
    • avgwdsvc.exe
    • avgwsvc.exe
    • avinitnt.exe
    • avmgma.exe
    • avp.exe
    • avpmapp.exe
    • avtray.exe
    • avwebgrd.exe
    • caavguiscan.exe
    • capfasem.exe
    • cappactiveprotection.exe
    • casc.exe
    • casecuritycenter.exe
    • cavrid.exe
    • ccSvcHst.exe
    • ccschedulersvc.exe
    • cctray.exe
    • cfp.exe
    • cmdagent.exe
    • drwebscd.exe
    • dvpapi.exe
    • dvprpt.exe
    • econceal.exe
    • econser.exe
    • egui.exe
    • ekrn.exe
    • elogsvc.exe
    • escanmon.exe
    • forsp.exe
    • fsaua.exe
    • fsav32.exe
    • fsavgui.exe
    • fsdfwd.exe
    • fsgk32.exe
    • fsgk32st.exe
    • fsguidll.exe
    • fspc.exe
    • fsqh.exe
    • fssm32.exe
    • fsus.exe
    • gozer.exe
    • guard.exe
    • guardxkickoff.exe
    • guardxservice.exe
    • guardxup.exe
    • hcontain.exe
    • hpcsvc.exe
    • hsvcmod.exe
    • isafe.exe
    • kavstart.exe
    • kissvc.exe
    • kmailmon.exe
    • kpfw32.exe
    • kpfwsvc.exe
    • kwatch.exe
    • livesrv.exe
    • livesrv.exe
    • mcagent.exe
    • mcmscsvc.exe
    • mcshell.exe
    • mcsysmon.exe
    • mcupdmgr.exe
    • mcvsmap.exe
    • mcvsshld.exe
    • mdmcls32.exe
    • msfwsvc.exe
    • msksrver.exe
    • npcsvc32.exe
    • npfsvc32.exe
    • npfuser.exe
    • nprosec.exe
    • nuaa.exe
    • nvcsched.exe
    • nvcsched.exe
    • nvoy.exe
    • op_mon.exe
    • pctsAuxs.exe
    • pctsGui.exe
    • pctsSvc.exe
    • pctsTray.exe
    • prevx.exe
    • psksvc.exe
    • qhfw.exe
    • rsnetsvr.exe
    • sbamui.exe
    • seccenter.exe
    • seccenter.exe
    • spiderml.exe
    • spidernt.exe
    • spidersgate.exe
    • spiderui.exe
    • svcprs32.exe
    • symlcsvc.exe
    • syssvcnt.exe
    • tpcfg.exe
    • tppfdmm.exe
    • tptray.exe
    • uiscan.exe
    • untray.exe
    • vba32ldr.exe
    • vbcmserv.exe
    • vbsystry.exe
    • vetmsg.exe
    • virCatch.exe
    • virusutilities.exe
    • vmacthlp.exe
    • vrfwsock.exe
    • vrfwsvc.exe
    • vrmonnt.exe
    • vrmonsvc.exe
    • vrrepair.exe
    • vrscan.exe
    • vsmon.exe
    • vsserv.exe
    • vsserv.exe
    • winss.exe
      • li>winssnotify.exe
    • xcommsvr.exe
    • zlclient.exe
  • It does not have information theft capabilities.
  • It does not have backdoor capabilities.
  • It does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.551.00

VSAPI OPR PATTERN Date:

19 Oct 2010

Step 1

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Close all opened browser windows

Step 3

Remove malware files dropped/downloaded by TROJ_DLOAD.SMAB

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer"s registry.

  • In HKEY_CLASSES_ROOT\PROTOCOLS\Filter
    • text/html
  • In HKEY_CLASSES_ROOT\CLSID
    • {random CLSID}

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOAD.SMAB If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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