TROJ_DLOAD.SM
Windows 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan may arrive as a file that exports functions used by other malware. It arrives as a component bundled with malware/grayware packages. However, as of this writing, the said sites are inaccessible.
It is injected into all running processes to remain memory resident.
It opens a hidden Internet Explorer window. It requires its main component to successfully perform its intended routine.
TECHNICAL DETAILS
Varies
DLL
No
06 Oct 2010
Arrival Details
This Trojan may arrive as a file that exports functions used by other malware.
It arrives as a component bundled with malware/grayware packages.
However, as of this writing, the said sites are inaccessible.
Installation
This Trojan is injected into all running processes to remain memory resident.
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Local\UIEI
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CLASSES_ROOT\CLSID\{random CLSID}\
InProcServer32
(default) = %User Temp%\mstmp
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{random CLSID}
HKEY_CLASSES_ROOT\PROTOCOLS\Filter\
text/html
Process Termination
This Trojan terminates the following processes if found running in the affected system's memory:
- ACAAS.exe
- ACAEGMr.exe
- ACAIS.exe
- ACALS.exe
- ACASP.exe
- AFMain.exe
- AGIDSUI.exe
- ALMon.exe
- ALsvc.exe
- APVXDWIN.EXE
- AVGIDSAgent.exe
- AVGIDSMonitor.exe
- AVGIDSWatcher.exe
- AhnSD.exe
- AhnSDsv.exe
- AluSchedulerSvc.exe
- ApVxdWin.exe
- CAGlobal.exe
- CAGlobalLight.exe
- CAPPActiveProtection.exe
- CCSVCHST.EXE
- CClaw.exe
- CounterSpy.exe
- EMLPROUI.EXE
- EMLPROXY.EXE
- FAMEH32.exe
- FCH32.EXE
- FPAVServer.exe
- FProtTray.exe
- FSM32.EXE
- FSMA32.EXE
- FSMB32.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
- MSASCui.exe
- MSProxy.ahn
- McNASvc.exe
- McProxy.exe
- McSACore.exe
- Mcshield.exe
- MpfSrv.exe
- MsMpEng.exe
- Nbrowser.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
- SBCSSvc.exe
- SBCSTray.exe
- SCANMSG.EXE
- SCANWSCS.EXE
- SavService.exe
- SfCtlCom.exe
- SpIDerAgent.exe
- SpIDerMI.exe
- TMBMSRV.exe
- TRAYSSER.EXE
- TSCFCommander.exe
- TSCFPlatformCOMSvr.exe
- TmPfw.exe
- TmProxy.exe
- UPSCHD.EXE
- UfNai.exe
- UfSeAgnt.exe
- UfUpdUi.exe
- UmxAgent.exe
- UmxCfg.exe
- UmxFwHlp.exe
- UmxPol.exe
- WEBPROXY.EXE
- WinSSUI.exe
- Zanda.exe
- Zlh.exe
- acs.exe
- ashDisp.exe
- ashMaiSv.exe
- ashServ.exe
- ashWebSv.exe
- aswUpdSv.exe
- avesvc.exe
- avgam.exe
- avgamsvr.exe
- avgas.exe
- avgcc.exe
- avgcsrvx.exe
- avgemc.exe
- avgfws8.exe
- avgnsx.exe
- avgrsx.exe
- avgtray.exe
- avgupd.exe
- avgupsvc.exe
- avgwdsvc.exe
- avgwsvc.exe
- avp.exe
- avpmapp.exe
- avwebgrd.exe
- caavguiscan.exe
- capfasem.exe
- cappactiveprotection.exe
- casc.exe
- casecuritycenter.exe
- cavrid.exe
- ccSvcHst.exe
- ccschedulersvc.exe
- cctray.exe
- drwebscd.exe
- egui.exe
- ekrn.exe
- elogsvc.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
- guard.exe
- guardxkickoff.exe
- guardxservice.exe
- guardxup.exe
- hcontain.exe
- hpcsvc.exe
- hsvcmod.exe
- isafe.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
- nvoy.exe
- op_mon.exe
- prevx.exe
- psksvc.exe
- qhfw.exe
- rsnetsvr.exe
- seccenter.exe
- spiderml.exe
- spidernt.exe
- spidersgate.exe
- spiderui.exe
- svcprs32.exe
- symlcsvc.exe
- vba32ldr.exe
- vbcmserv.exe
- vbsystry.exe
- vetmsg.exe
- virCatch.exe
- virusutilities.exe
- vrfwsock.exe
- vrfwsvc.exe
- vrmonnt.exe
- vrmonsvc.exe
- vrrepair.exe
- vrscan.exe
- vsmon.exe
- vsserv.exe
- winss.exe
- winssnotify.exe
- xcommsvr.exe
- zlclient.exe
Dropping Routine
This Trojan drops the following files:
- %User Temp%\mstmp - also detected as TROJ_DLOAD.SM
(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 opens a hidden Internet Explorer window.
It requires its main component to successfully perform its intended routine.
It attempts to access the following websites to download files, which are possibly malicious:
- http://www.{BLOCKED}iaz.com/photo/{random}.php?{random}
- http://www.{BLOCKED}litzk.com/photo/{random}.php?{random}
- http://{BLOCKED}.{BLOCKED}.7.152/photo/{random}.php?{random}
It does the following:
- It then opens a hidden Internet Explorer where it connect to remote sites to download possibly malicious files. It then saves and execute the downloaded file on the affected system. As a result, routines of the downloaded file are then exhibited on the affected system.
- It has no capability to steal information.
- However, it does not function without its main component.
SOLUTION
8.900
7.516.12
06 Oct 2010
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Scan your computer with your Trend Micro product and note files detected as TROJ_DLOAD.SM
Step 3
Restart in Safe Mode
Step 4
Delete the created random CLSID key
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.
Step 5
Delete this registry key
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
- text/html
Step 6
Search and delete the file detected as TROJ_DLOAD.SM
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOAD.SM. 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.
Step 8
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOAD.SM. 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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