Hallo! Ich habe mein Sytem gescannt und es wurde ein Trojaner namens Trojan.ATRAPS!IK gefunden (aufgefallen da ständig Fehlermeldungen beim starten des Internet Explorers kamen).
Leider kann mein Anti-Malware Programm a-squared den Trojaner nicht killen. Was kann ich tun? Hier die Auswertung von HiJackThis:

Logfile of Trend Micro HijackThis v2.0.3 (BETA)
Scan saved at 19:17:19, on 27.02.2010
Platform: Windows Vista SP2 (WinNT 6.00.1906)
MSIE: Internet Explorer v7.00 (7.00.6002.18005)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Nokia\Nokia PC Suite 7\PCSuite.exe
C:\Program Files (x86)\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Program Files (x86)\Nokia\Nokia PC Suite 7\PcSync2.exe
C:\Program Files (x86)\Personal Backup 5\Persbackup.exe
C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch Buttons\QLBCtrl.exe
C:\Program Files (x86)\iTunes\iTunesHelper.exe
C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\acrotray.exe
C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\avp.exe
C:\Program Files (x86)\Hp\HP Software Update\hpwuschd2.exe
C:\Program Files (x86)\Analog Devices\Core\smax4pnp.exe
C:\Program Files (x86)\a-squared Anti-Malware\a2guard.exe
C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch Buttons\VolCtrl.exe
C:\Windows\SysWOW64\explorer.exe
C:\Windows\SysWOW64\explorer.exe
C:\Windows\SysWOW64\explorer.exe
C:\Windows\SysWOW64\explorer.exe
C:\Program Files (x86)\Common Files\Nokia\MPAPI\MPAPI3s.exe
C:\Program Files (x86)\Internet Explorer\iexplore.exe
C:\Program Files (x86)\PC Connectivity Solution\Transports\NclMSBTSrv.exe
C:\Program Files (x86)\TrendMicro\HiJackThis\HiJackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://google.de/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://companyweb
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: (no name) - {E312764E-7706-43F1-8DAB-FCDD2B1E416D} - C:\Program Files (x86)\pdfforge Toolbar\SearchSettings.dll (file missing)
O1 - Hosts: ::1 localhost
O2 - BHO: Adobe PDF Conversion Toolbar Helper - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files (x86)\Google\GoogleToolbarNotifier\5.2.4204.1700\swg.dll
O2 - BHO: pdfforge Toolbar - {B922D405-6D13-4A2B-AE89-08A030DA4402} - C:\Program Files (x86)\pdfforge Toolbar\IE\1.1.2\pdfforgeToolbarIE.dll (file missing)
O2 - BHO: (no name) - {E312764E-7706-43F1-8DAB-FCDD2B1E416D} - C:\Program Files (x86)\pdfforge Toolbar\SearchSettings.dll (file missing)
O3 - Toolbar: pdfforge Toolbar - {B922D405-6D13-4A2B-AE89-08A030DA4402} - C:\Program Files (x86)\pdfforge Toolbar\IE\1.1.2\pdfforgeToolbarIE.dll (file missing)
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll
O4 - HKLM\..\Run: [QlbCtrl.exe] "C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch Buttons\QlbCtrl.exe" /Start
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files (x86)\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [Acrobat Assistant 8.0] "C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\Acrotray.exe"
O4 - HKLM\..\Run: [AVP] "C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\avp.exe"
O4 - HKLM\..\Run: [HP Software Update] C:\Program Files (x86)\Hp\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files (x86)\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe" MSRun
O4 - HKLM\..\Run: [a-squared] "C:\PROGRAM FILES (X86)\A-SQUARED ANTI-MALWARE\a2guard.exe" /d=60
O4 - HKLM\..\Run: [AVAST SECURITY SCANNER] C:\Program Files (x86)\AVAST SECURITY\Updater32.EXE
O4 - HKCU\..\Run: [PC Suite Tray] "C:\Program Files (x86)\Nokia\Nokia PC Suite 7\PCSuite.exe" -onlytray
O4 - HKCU\..\Run: [swg] "C:\Program Files (x86)\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe"
O4 - HKCU\..\Run: [Nokia.PCSync] "C:\Program Files (x86)\Nokia\Nokia PC Suite 7\PcSync2.exe" /NoDialog
O4 - HKCU\..\Run: [AVAST SECURITY UPDATER] C:\Program Files (x86)\AVAST SECURITY\Updater32.EXE
O4 - HKLM\..\Policies\Explorer\Run: [AVAST SECURITY] C:\Program Files (x86)\AVAST SECURITY\Updater32.EXE
O4 - HKCU\..\Policies\Explorer\Run: [AVAST SECURITY] C:\Program Files (x86)\AVAST SECURITY\Updater32.EXE
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'LOKALER DIENST')
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'LOKALER DIENST')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'NETZWERKDIENST')
O4 - Startup: Persbackup.lnk = C:\Program Files (x86)\Personal Backup 5\Persbackup.exe
O8 - Extra context menu item: Add to Google Photos Screensa&ver - res://C:\Windows\system32\GPhotos.scr/200
O8 - Extra context menu item: An vorhandenes PDF anfügen - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Ausgewählte Verknüpfungen in Adobe PDF konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECaptureSelLinks.html
O8 - Extra context menu item: Ausgewählte Verknüpfungen in vorhandene PDF-Datei konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppendSelLinks.html
O8 - Extra context menu item: Auswahl in Adobe PDF konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Auswahl in vorhandene PDF-Datei konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Hinzufügen zu Anti-Banner - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\ie_banner_deny.htm
O8 - Extra context menu item: In Adobe PDF konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Nach Microsoft E&xel exportieren - res://C:\PROGRA~2\MICROS~1\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Verknüpfungsziel in Adobe PDF konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Verknüpfungsziel in vorhandene PDF-Datei konvertieren - res://C:\Program Files (x86)\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O9 - Extra button: Statistik für Web-Anti-Virus - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\scieplgn.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~2\MICROS~1\Office12\REFIEBAR.DLL
O13 - Gopher Prefix:
O16 - DPF: {1663ed61-23eb-11d2-b92f-008048fdd814} (MeadCo ScriptX Advanced) - http://www.shipitsmarter.com/print3/smsx.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = beckmann-dom1.local
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = beckmann-dom1.local
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain = beckmann-dom1.local
O20 - AppInit_DLLs: C:\PROGRA~2\KASPER~1\KASPER~1.0FO\adialhk.dll C:\PROGRA~2\KASPER~1\KASPER~1.0FO\kloehk.dll
O22 - SharedTaskScheduler: Component Categories cache daemon - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\Windows\system32\browseui.dll
O23 - Service: a-squared Anti-Malware Service (a2AntiMalware) - Emsi Software GmbH - C:\Program Files (x86)\a-squared Anti-Malware\a2service.exe
O23 - Service: Andrea ADI Filters Service (AEADIFilters) - Unknown owner - C:\Windows\system32\AEADISRV.EXE (file missing)
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: AMD External Events Utility - Unknown owner - C:\Windows\system32\atiesrxx.exe (file missing)
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Application Updater - Spigot, Inc. - C:\Program Files (x86)\Application Updater\ApplicationUpdater.exe
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Program Files (x86)\Common Files\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: Kaspersky Anti-Virus 6.0 (AVP) - Kaspersky Lab - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\avp.exe
O23 - Service: Bonjour-Dienst (Bonjour Service) - Apple Inc. - C:\Program Files (x86)\Bonjour\mDNSResponder.exe
O23 - Service: Com4QLBEx - Hewlett-Packard Development Company, L.P. - C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch Buttons\Com4QLBEx.exe
O23 - Service: @dfsrres.dll,-101 (DFSR) - Unknown owner - C:\Windows\system32\DFSR.exe (file missing)
O23 - Service: DisplayLink Service (DisplayLinkService) - DisplayLink Corp. - C:\Program Files\DisplayLink Core Software\DisplayLinkService.exe
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Program Files (x86)\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Google Update Service (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Program Files (x86)\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: hpqwmiex - Hewlett-Packard Development Company, L.P. - C:\Program Files (x86)\Hewlett-Packard\Shared\hpqwmiex.exe
O23 - Service: HP Service (hpsrv) - Unknown owner - C:\Windows\system32\Hpservice.exe (file missing)
O23 - Service: iPod-Dienst (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Kaspersky Lab Network Agent (klnagent) - Kaspersky Lab - C:\Program Files (x86)\Kaspersky Lab\NetworkAgent 8\klnagent.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NMSAccessU - Unknown owner - C:\Program Files (x86)\CDBurnerXP\NMSAccessU.exe
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: ServiceLayer - Nokia - C:\Program Files (x86)\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: @%SystemRoot%\system32\SLsvc.exe,-101 (slsvc) - Unknown owner - C:\Windows\system32\SLsvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: SWIHPWMI - Sierra Wireless Inc. - C:\Program Files (x86)\HPQ\Shared\Sierra Wireless\Win32\Unicode\SWIHPWMI.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%ProgramFiles%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)
O23 - Service: XAudioService - Unknown owner - C:\Windows\system32\DRIVERS\xaudio64.exe (file missing)

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End of file - 13183 bytes

Vielen Dank vorab!

Ach ja, die Datei "C:\Program Files (x86)\AVAST SECURITY\Updater32.EXE" soll dafür verantwortlich sein bzw. den Trojaner enthalten. Finde die Datei jedoch nicht im angegebenen Verzeichnis... ?!