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TROJ_DLOADR.ATT

October 08, 2012
 Analysis by: MarfelTi
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive as a file that exports functions used by other malware.

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

File Size:

21,629 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

31 Mar 2011

Payload:

Opens Internet Explorer window, Terminates processes, Downloads files

Arrival Details

This Trojan may arrive as a file that exports functions used by other malware.

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

Backdoor Routine

As of this writing, the said sites are inaccessible.

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}ies.com/photo/{random}.php?{random}
  • http://www.{BLOCKED}edia.com/photo/{random}.php?{random}
  • http://{BLOCKED}8.{BLOCKED}0.7.152/photo/{random}.php?{random}

NOTES:
It terminates the following antivirus-related processes if found running in 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.ex
  • 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
It is a .DLL file that is usually dropped as %User Temp%\msfat32. It opens a hidden Internet Explorer window where it connects to remote sites to download possibly malicious files. It then saves and executes the downloaded file on the affected system. As a result, routines of the downloaded file are then exhibited on the affected system. 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

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_DLOADR.ATT

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_DLOADR.ATT

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.ATT. 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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