TROJ_DLOAD.SM

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.

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.