TROJ_EXEDOT.SM

 Analysis by: jasperm

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It registers itself as a Browser Helper Object (BHO) to ensure its automatic execution every time Internet Explorer is run. It does this by creating registry keys/entries.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

07 Oct 2010

Payload:

Downloads files

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Autostart Technique

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

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

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

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

HKEY_CLASSES_ROOT\AppID\{A0E1054B-01EE-4D57-A059-4D99F339709F}

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

HKEY_CLASSES_ROOT\AppID\main.DLL

HKEY_CLASSES_ROOT\main.BHO

HKEY_CLASSES_ROOT\main.BHO.1

It registers itself as a Browser Helper Object (BHO) to ensure its automatic execution every time Internet Explorer is run. It does this by creating the following registry key(s)/entry(ies):

HKEY_CLASSES_ROOT\CLSID\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}\
InProcServer32
@ = {malware path and file name}.DLL

Download Routine

This Trojan connects to the following URL(s) to download its configuration file:

  • {BLOCKED}kzcompile.com
  • {BLOCKED}exad.com

It saves the files it downloads using the following names:

  • %User Temp%\\{random}.TMP - downloaded file
  • %Current%\\{malware name}.sig - possible configuration file

(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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

Based on analysis of the codes, it has the following capabilities:

  • This malware connects to URLs to possibly download other malicious files and configuration files.

It does the following:

  • It checks and records if the following processes are running in system memory:
  • acaas.exe
  • acaegmr.exe
  • acais.exe
  • acals.exe
  • acasp.exe
  • afmain.exe
  • ahnsd.exe
  • ahnsdsv.exe
  • almon.exe
  • alsvc.exe
  • aluschedulersvc.exe
  • apvxdwin.exe
  • ashdisp.exe
  • ashmaisv.exe
  • ashserv.exe
  • ashwebsv.exe
  • aswupdsv.exe
  • avengine.exe
  • avesvc.exe
  • avgam.exe
  • avgamsvr.exe
  • avgas.exe
  • avgcc.exe
  • avgemc.exe
  • avgfws8.exe
  • avgnsx.exe
  • avgnt.exe
  • avgrsx.exe
  • avgtray.exe
  • avguard.exe
  • avgupsvc.exe
  • avgwdsvc.exe
  • avgwsvc.exe
  • avkproxy.exe
  • avkservice.exe
  • avktray.exe
  • avkwctl.exe
  • avmailc.exe
  • avp.exe
  • avpmapp.exe
  • avwebgrd.exe
  • AxEetucexEllehS
  • bdagent.exe
  • bdtupdateservice.exe
  • caavguiscan.exe
  • caglobal.exe
  • cagloballight.exe
  • capfasem.exe
  • cappactiveprotection.exe
  • cavrid.exe
  • ccenter.exe
  • cclaw.exe
  • ccprovsp.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
  • fpavserver.exe
  • fprottray.exe
  • fsaua.exe
  • fsav32.exe
  • fsavgui.exe
  • fsdfwd.exe
  • fsgk32st.exe
  • fsguidll.exe
  • fsm32.exe
  • fsma32.exe
  • fsmb32.exe
  • fsqh.exe
  • fssm32.exe
  • fsus.exe
  • fulltiltpoker.exe
  • gdfirewalltray.exe
  • gdfwsvc.exe
  • guard.exe
  • guardxkickoff.exe
  • guardxservice.exe
  • guardxup.exe
  • hfacsvc.exe
  • hpcsvc.exe
  • hrres.exe
  • hsvcmod.exe
  • iface.exe
  • isafe.exe
  • itmrtsvc.exe
  • k7emlpxy.exe
  • k7fwsrvc.exe

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.521.80

VSAPI PATTERN Date:

07 Oct 2010

VSAPI PATTERN Date:

10/7/2010 12:00:00 AM

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 these Browser Helper Object (BHO) registry keys

[ Learn More ]
DATA_GENERIC
  • Still in the command prompt type the following then press Enter:
    • On Windows 98 and ME, type
    RUNDLL DATA_GENERIC ,DllUnregisterServer
    • On Windows NT, 2000, XP, and Server 2003, type
    REGSVR32 DATA_GENERIC /U
  • Click Yes or OK when prompted.
  • Close command prompt.
  • Step 4

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