Author: Clive Fuentebella   
 

a variant of MSIL/WebCompanion.C potentially unwanted application (NOD32)

 PLATFORM:

Windows

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL::
 DISTRIBUTION POTENTIAL::
 REPORTED INFECTION:
 INFORMATION EXPOSURE:
Low
Medium
High
Critical

  • Threat Type:
    Potentially Unwanted Application

  • Destructiveness:
    No

  • Encrypted:
    No

  • In the wild::
    Yes

  OVERVIEW

INFECTION CHANNEL: Descargado de Internet, Eliminado por otro tipo de malware

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File size: 507,592 bytes
File type: EXE
Memory resident: No
PAYLOAD: Connects to URLs/IPs, Drops files

Detalles de entrada

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Instalación

Infiltra los archivos siguientes:

  • %Application Data%\Lavasoft\Web Companion\Options\CData.txt
  • %Application Data%\Lavasoft\Web Companion\Options\FData.txt
  • %Application Data%\Lavasoft\Web Companion\Options\IData.txt
  • %Application Data%\Lavasoft\Web Companion\Options\Language.txt
  • %Program Files%\Lavasoft\Web Companion\Application\{Language code}\WebCompanion.resources.dll
  • %Program Files%\Lavasoft\Web Companion\Application\{Language code}\WebCompanionInstaller.resources.dll
  • %Program Files%\Lavasoft\Web Companion\Application\7za.exe
  • %Program Files%\Lavasoft\Web Companion\Application\acs17.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Ad-Aware Web Companion.exe
  • %Program Files%\Lavasoft\Web Companion\Application\BCUEngineS.dll
  • %Program Files%\Lavasoft\Web Companion\Application\BCUSDK.dll
  • %Program Files%\Lavasoft\Web Companion\Application\DotNetZip.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Esent.Interop.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Extension\@wcextensionff.xpi
  • %Program Files%\Lavasoft\Web Companion\Application\ICSharpCode.SharpZipLib.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.IWshRuntimeLibrary.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.LavasoftTcpServiceLib.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.SHDocVw.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.Shell32.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.WUApiLib.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Ionic.Zip.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.adblocker.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.AppCore.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Automation.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Compression.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.CSharp.Utilities.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Events.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Extension.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.IEController.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Omni.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.SearchProtect.Business.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.SearchProtect.Repositories.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Settings.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.SysInfo.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Utils.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Utils.SqlLite.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.Service.Logger.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WcfService.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\liblz4.dll
  • %Program Files%\Lavasoft\Web Companion\Application\log4net.dll
  • %Program Files%\Lavasoft\Web Companion\Application\LZ4.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Microsoft.mshtml.dll
  • %Program Files%\Lavasoft\Web Companion\Application\MozCompressor.dll
  • %Program Files%\Lavasoft\Web Companion\Application\NCalc.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Newtonsoft.Json.dll
  • %Program Files%\Lavasoft\Web Companion\Application\System.Data.SQLite.dll
  • %Program Files%\Lavasoft\Web Companion\Application\ucrtbased.dll
  • %Program Files%\Lavasoft\Web Companion\Application\vcruntime140d.dll
  • %Program Files%\Lavasoft\Web Companion\Application\WcCommunication.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WcCommunication.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\WebcompaionReimageIcon.ico
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanion.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanion.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanion.Loader.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionExtensionIE.dll
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionIcon_Pro.ico
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionIcon.ico
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionInstaller.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionInstaller.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionInstaller.pdb
  • %Program Files%\Lavasoft\Web Companion\Application\x64\SQLite.Interop.dll
  • %Program Files%\Lavasoft\Web Companion\Application\x86\SQLite.Interop.dll
  • %ProgramData%\Lavasoft\Web Companion\Logs\Webcompanion\webcompanion.log
  • %ProgramData%\Lavasoft\Web Companion\Options\ActiveFeatures.zip
  • %ProgramData%\Lavasoft\Web Companion\Options\ChannelInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\CurrentReleaseNotes.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\EventSafeguard.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\FeatureActions.zip
  • %ProgramData%\Lavasoft\Web Companion\Options\install.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\LatestReleaseNotes.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\partner.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\PerformedActions.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\ProfileInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\ProfileInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\ServicePartnerInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\Statistics.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\UpdateServer.txt
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\Lavasoft\WebCompanion\Frequently Asked Questions.url
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\Lavasoft\WebCompanion\Web Companion.lnk
  • %User Temp%\7z{Random characters}\{Language code}\WebCompanionInstaller.resources.dll
  • %User Temp%\7z{Random characters}\ICSharpCode.SharpZipLib.dll
  • %User Temp%\7z{Random characters}\Newtonsoft.Json.dll
  • %User Temp%\7z{Random characters}\WebCompanionInstaller.exe
  • %User Temp%\7z{Random characters}\WebCompanionInstaller.exe.config
  • %User Temp%\WcInstaller.log
  • %User Temp%\WebCompanion.zip

(Nota: %Application Data% es la carpeta Application Data del usuario activo, que en el caso de Windows 98 y ME suele estar ubicada en C:\Windows\Profiles\{nombre de usuario}\Application Data, en el caso de Windows NT en C:\WINNT\Profiles\{nombre de usuario}\Application Data, en el caso de Windows 2000(32-bit), XP y Server 2003(32-bit) en C:\Documents and Settings\{nombre de usuario}\Local Settings\Application Data y en el caso de Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) y 10(64-bit) en C:\Users\{nombre de usuario}\AppData\Roaming.).

. %Program Files% es la carpeta Archivos de programa predeterminada, que suele estar en C:\Archivos de programa).

. %User Temp% es la carpeta Temp del usuario activo, que en el caso de Windows 2000(32-bit), XP y Server 2003(32-bit) suele estar en C:\Documents and Settings\{nombre de usuario}\Local Settings\Temp y en el case de Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) y 10(64-bit) en C:\Users\{nombre de usuario}\AppData\Local\Temp).

)

Otros detalles

It connects to the following possibly malicious URL:

  • http://rt.{BLOCKED}panion.com/notifications/download/rt/ActiveFeatures.zip
  • http://rt.{BLOCKED}panion.com/notifications/download/rt/postrun/prod/v1/FeatureActions.zip
  • http://sg-bitmask.{BLOCKED}e.com:443
  • http://wc-partners.{BLOCKED}ft.com/Partner.svc/GetPartnerInfo?partner={Random characters}
  • http://wc-update-service.{BLOCKED}ft.com/update.asmx
  • http://wcdownloadercdn.{BLOCKED}ft.com/7.0.2417.4248/WebCompanion-7.0.2417.4248-prod.zip
  • http://{BLOCKED}panion.com/installer/css/styles.css?{Random characters}
  • http://{BLOCKED}panion.com/version_logs?json=true&version=7.0.2417.4248
  • http://wsgeoip.{BLOCKED}ft.com/ipservice.asmx
  • http://www.{BLOCKED}panion.com/installerview/consent_2?culture=en&hp=1&se=1

  SOLUTION

Minimum scan engine: 9.800
SSAPI Pattern-Datei: 2.409.00
SSAPI Pattern veröffentlicht am: 20 de мая de 2021

Step 2

Los usuarios de Windows ME y XP, antes de llevar a cabo cualquier exploración, deben comprobar que tienen desactivada la opción Restaurar sistema para permitir la exploración completa del equipo.

Step 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Buscar y eliminar este archivo

[ learnMore ]
Puede que algunos de los archivos del componente estén ocultos. Asegúrese de que tiene activada la casilla Buscar archivos y carpetas ocultos en la opción Más opciones avanzadas para que el resultado de la búsqueda incluya todos los archivos y carpetas ocultos.
  • %Application Data%\Lavasoft\Web Companion\Options\CData.txt
  • %Application Data%\Lavasoft\Web Companion\Options\FData.txt
  • %Application Data%\Lavasoft\Web Companion\Options\IData.txt
  • %Application Data%\Lavasoft\Web Companion\Options\Language.txt
  • %Program Files%\Lavasoft\Web Companion\Application\{Language code}\WebCompanion.resources.dll
  • %Program Files%\Lavasoft\Web Companion\Application\{Language code}\WebCompanionInstaller.resources.dll
  • %Program Files%\Lavasoft\Web Companion\Application\7za.exe
  • %Program Files%\Lavasoft\Web Companion\Application\acs17.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Ad-Aware Web Companion.exe
  • %Program Files%\Lavasoft\Web Companion\Application\BCUEngineS.dll
  • %Program Files%\Lavasoft\Web Companion\Application\BCUSDK.dll
  • %Program Files%\Lavasoft\Web Companion\Application\DotNetZip.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Esent.Interop.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Extension\@wcextensionff.xpi
  • %Program Files%\Lavasoft\Web Companion\Application\ICSharpCode.SharpZipLib.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.IWshRuntimeLibrary.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.LavasoftTcpServiceLib.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.SHDocVw.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.Shell32.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Interop.WUApiLib.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Ionic.Zip.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.adblocker.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.AppCore.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Automation.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Compression.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.CSharp.Utilities.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Events.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Extension.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.IEController.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Omni.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.SearchProtect.Business.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.SearchProtect.Repositories.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Settings.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.SysInfo.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Utils.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.Utils.SqlLite.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.Service.Logger.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WcfService.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe
  • %Program Files%\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\liblz4.dll
  • %Program Files%\Lavasoft\Web Companion\Application\log4net.dll
  • %Program Files%\Lavasoft\Web Companion\Application\LZ4.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Microsoft.mshtml.dll
  • %Program Files%\Lavasoft\Web Companion\Application\MozCompressor.dll
  • %Program Files%\Lavasoft\Web Companion\Application\NCalc.dll
  • %Program Files%\Lavasoft\Web Companion\Application\Newtonsoft.Json.dll
  • %Program Files%\Lavasoft\Web Companion\Application\System.Data.SQLite.dll
  • %Program Files%\Lavasoft\Web Companion\Application\ucrtbased.dll
  • %Program Files%\Lavasoft\Web Companion\Application\vcruntime140d.dll
  • %Program Files%\Lavasoft\Web Companion\Application\WcCommunication.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WcCommunication.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\WebcompaionReimageIcon.ico
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanion.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanion.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanion.Loader.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionExtensionIE.dll
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionIcon_Pro.ico
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionIcon.ico
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionInstaller.exe
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionInstaller.exe.config
  • %Program Files%\Lavasoft\Web Companion\Application\WebCompanionInstaller.pdb
  • %Program Files%\Lavasoft\Web Companion\Application\x64\SQLite.Interop.dll
  • %Program Files%\Lavasoft\Web Companion\Application\x86\SQLite.Interop.dll
  • %ProgramData%\Lavasoft\Web Companion\Logs\Webcompanion\webcompanion.log
  • %ProgramData%\Lavasoft\Web Companion\Options\ActiveFeatures.zip
  • %ProgramData%\Lavasoft\Web Companion\Options\ChannelInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\CurrentReleaseNotes.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\EventSafeguard.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\FeatureActions.zip
  • %ProgramData%\Lavasoft\Web Companion\Options\install.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\LatestReleaseNotes.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\partner.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\PerformedActions.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\ProfileInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\ProfileInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\ServicePartnerInfo.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\Statistics.txt
  • %ProgramData%\Lavasoft\Web Companion\Options\UpdateServer.txt
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\Lavasoft\WebCompanion\Frequently Asked Questions.url
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\Lavasoft\WebCompanion\Web Companion.lnk
  • %User Temp%\7z{Random characters}\{Language code}\WebCompanionInstaller.resources.dll
  • %User Temp%\7z{Random characters}\ICSharpCode.SharpZipLib.dll
  • %User Temp%\7z{Random characters}\Newtonsoft.Json.dll
  • %User Temp%\7z{Random characters}\WebCompanionInstaller.exe
  • %User Temp%\7z{Random characters}\WebCompanionInstaller.exe.config
  • %User Temp%\WcInstaller.log
  • %User Temp%\WebCompanion.zip

Step 5

Explorar el equipo con su producto de Trend Micro para eliminar los archivos detectados como PUA.MSIL.WebCompanion.AE En caso de que el producto de Trend Micro ya haya limpiado, eliminado o puesto en cuarentena los archivos detectados, no serán necesarios más pasos. Puede optar simplemente por eliminar los archivos en cuarentena. Consulte esta página de Base de conocimientos para obtener más información.


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