TROJ_EXEDOT.AH


 ALIASES:

Microsoft : Trojan:Win32/Evadiped.A; Sophos : Mal/BHO-P

 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 connects to URLs to download other possibly malicious files and configuration files.

It checks and reports to the URLs if certain processes are running on the system.

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

344,077 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

28 Mar 2011

Payload:

Downloads files

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be dropped by other malware.

Autostart Technique

This Trojan adds the following registry keys to install itself as a Browser Helper Object (BHO):

HKEY_CLASSES_ROOT\main.BHO

HKEY_CLASSES_ROOT\main.BHO.1

HKEY_CLASSES_ROOT\AppID\main.DLL

HKEY_CLASSES_ROOT\Interface\{986A8AC1-AB4D-4F41-9068-4B01C0197867}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

HKEY_CLASSES_ROOT\TypeLib\{8E3C68CD-F500-4A2A-8CB9-132BB38C3573}

HKEY_CLASSES_ROOT\CLSID\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry entries:

HKEY_CLASSES_ROOT\CLSID\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}\
InprocServer32
@ = {malware path and file name}

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Temp%\{random file name}.TMP
  • %Current Folder%\{malware name}.sig

(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.)

NOTES:

It connects to the following URLs to download other possibly malicious files and configuration files:

  • k.{BLOCKED}xad.com
  • {BLOCKED}e.netstandpoints.com
  • u.{BLOCKED}bar.com
  • u.{BLOCKED}compile.com

It checks and reports to the URLs above if the following processes are running on the system:

  • 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
  • AxEetucexEllehS
  • 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
  • acaas.exe
  • acaegmr.exe
  • acais.exe
  • acals.exe
  • acasp.exe
  • acs.exe
  • afmain.exe
  • ahnsd.exe
  • ahnsdsv.exe
  • almon.exe
  • alsvc.exe
  • aluschedulersvc.exe
  • apvxdwin.exe
  • ashDisp.exe
  • ashMaiSv.exe
  • ashServ.exe
  • ashWebSv.exe
  • ashdisp.exe
  • ashmaisv.exe
  • ashserv.exe
  • ashwebsv.exe
  • aswUpdSv.exe
  • aswupdsv.exe
  • avengine.exe
  • avesvc.exe
  • avgam.exe
  • avgamsvr.exe
  • avgas.exe
  • avgcc.exe
  • avgcsrvx.exe
  • avgemc.exe
  • avgfws8.exe
  • avgnsx.exe
  • avgnt.exe
  • avgrsx.exe
  • avgtray.exe
  • avguard.exe
  • avgupd.exe
  • avgupsvc.exe
  • avgwdsvc.exe
  • avgwsvc.exe
  • avkproxy.exe
  • avkservice.exe
  • avktray.exe
  • avkwctl.exe
  • avmailc.exe
  • avp.exe
  • avpmapp.exe
  • avwebgrd.exe
  • bdagent.exe
  • bdtupdateservice.exe
  • caavguiscan.exe
  • caglobal.exe
  • cagloballight.exe
  • capfasem.exe
  • cappactiveprotection.exe
  • casc.exe
  • casecuritycenter.exe
  • cavrid.exe
  • ccSvcHst.exe
  • ccenter.exe
  • cclaw.exe
  • ccprovsp.exe
  • ccschedulersvc.exe
  • ccsvchst.exe
  • cctray.exe
  • cfgmng32.exe
  • consctl.exe
  • counterspy.exe
  • drwebscd.exe
  • dvpapi.exe
  • egui.exe
  • ekrn.exe
  • elogsvc.exe
  • emlproui.exe
  • emlproxy.exe
  • escanmon.exe
  • fameh32.exe
  • fch32.exe
  • forsp.exe
  • fpavserver.exe
  • fprottray.exe
  • fsaua.exe
  • fsav32.exe
  • fsavgui.exe
  • fsdfwd.exe
  • fsgk32.exe
  • fsgk32st.exe
  • fsguidll.exe
  • fsm32.exe
  • fsma32.exe
  • fsmb32.exe
  • fspc.exe
  • fsqh.exe
  • fssm32.exe
  • fsus.exe
  • fulltiltpoker.exe
  • gdfirewalltray.exe
  • gdfwsvc.exe
  • guard.exe
  • guardxkickoff.exe
  • guardxservice.exe
  • guardxup.exe
  • hcontain.exe
  • hfacsvc.exe
  • hpcsvc.exe
  • hrres.exe
  • hsvcmod.exe
  • iface.exe
  • isafe.exe
  • itmrtsvc.exe
  • k7emlpxy.exe
  • k7fwsrvc.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

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

07.936.07

FIRST VSAPI PATTERN DATE:

29 Mar 2011

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

Close all opened browser windows

Step 3

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
    • main.BHO
  • In HKEY_CLASSES_ROOT
    • main.BHO.1
  • In HKEY_CLASSES_ROOT\AppID
    • main.DLL
  • In HKEY_CLASSES_ROOT\Interface
    • {986A8AC1-AB4D-4F41-9068-4B01C0197867}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {8E3C68CD-F500-4A2A-8CB9-132BB38C3573}
  • In HKEY_CLASSES_ROOT\CLSID
    • {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_EXEDOT.AH. 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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