Ciao a tutti, volevo esporre il mio problema: ho una rete domestica composta da 2 PC desktop e 1 portatile. Questi PC sono collegati in rete tramite un router Belkin (allego immagine della struttura della rete relativa ai soli PC fissi, il portatile non sempre è collegato).

Da alcuni giorni il router registra tentativi di attacco da parte dell'indirizzo IP corrispondente al mio PC, come se qualcuno usasse a mia insaputa il mio PC in remoto!! Il testo dell'allarme - sempre uguale - è
==>Found attack from 192.168...ecc..source port is 137 and destination port is 137 which use the UDP protocol
che può essere? Tanto per cominciare ed in attesa di istruzioni più precise allego il log di Hijachthis, grazie dell'aiuto che potrete darmi:
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Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 13:42:21, on 03/08/2011
Platform: Windows 7 (WinNT 6.00.3504)
MSIE: Internet Explorer v8.00 (8.00.7600.16800)
Boot mode: Normal

Running processes:
C:\Windows\system32\taskhost.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Program Files\G Data\InternetSecurity\Firewall\GDFirewallTray.exe
C:\Program Files\G Data\InternetSecurity\AVKTray\AVKTray.exe
C:\Program Files\Canon\Canon IJ Network Scan Utility\CNMNSUT.exe
C:\Program Files\Common Files\Java\Java Update\jusched.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Windows\system32\wuauclt.exe
C:\Users\Public\Documents\PowerOffer\POService.exe
M:\Trend Micro\HiJackThis\HiJackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
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
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: 74.208.10.249 gs.apple.com
O2 - BHO: G Data WebFilter Class - {0124123D-61B4-456f-AF86-78C53A0790C5} - C:\Program Files\G Data\InternetSecurity\Webfilter\AVKWebIE.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: PowerOffer - {3543619C-D563-43f7-95EA-4DA7E1CC396A} - C:\Users\Public\Documents\PowerOffer\PowerOfferBHO.dll
O2 - BHO: Windows Live ID Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: SkypeIEPluginBHO - {AE805869-2E5C-4ED4-8F7B-F1F7851A4497} - C:\Program Files\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: G Data WebFilter - {0124123D-61B4-456f-AF86-78C53A0790C5} - C:\Program Files\G Data\InternetSecurity\Webfilter\AVKWebIE.dll
O4 - HKLM\..\Run: [GDFirewallTray] C:\Program Files\G Data\InternetSecurity\Firewall\GDFirewallTray.exe
O4 - HKLM\..\Run: [G DATA AntiVirus Trayapplication] C:\Program Files\G Data\InternetSecurity\AVKTray\AVKTray.exe
O4 - HKLM\..\Run: [IJNetworkScanUtility] C:\Program Files\Canon\Canon IJ Network Scan Utility\CNMNSUT.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Common Files\Java\Java Update\jusched.exe"
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Scarica con Mipony - file://M:\MiPony\Browser\IEContext.htm
O9 - Extra button: Skype add-on for Internet Explorer - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Program Files\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra 'Tools' menuitem: Skype add-on for Internet Explorer - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Program Files\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: PokerStars.it - {C4046502-6524-4d87-896C-878F57D1FF07} - C:\Program Files\PokerStars.IT\PokerStarsUpdate.exe
O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/flashplayer/current/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{EC8A2FEE-5C13-4BBB-956F-8D9543AA2F95}: NameServer = 192.168.2.1
O18 - Protocol: skype-ie-addon-data - {91774881-D725-4E58-B298-07617B9B86A8} - C:\Program Files\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: G Data AntiVirus Proxy (AVKProxy) - G Data Software AG - C:\Program Files\Common Files\G DATA\AVKProxy\AVKProxy.exe
O23 - Service: G Data Scheduler (AVKService) - G Data Software AG - C:\Program Files\G Data\InternetSecurity\AVK\AVKService.exe
O23 - Service: G Data Guardiano del file system (AVKWCtl) - G Data Software AG - C:\Program Files\G Data\InternetSecurity\AVK\AVKWCtl.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: G Data Personal Firewall (GDFwSvc) - G Data Software AG - C:\Program Files\G Data\InternetSecurity\Firewall\GDFwSvc.exe
O23 - Service: G Data Scanner (GDScan) - G Data Software AG - C:\Program Files\Common Files\G DATA\GDScan\GDScan.exe
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Intel(R) PROSet Monitoring Service - Intel Corporation - C:\Windows\system32\IProsetMonitor.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Process Monitor (LVPrcSrv) - Logitech Inc. - C:\Program Files\Common Files\LogiShrd\LVMVFM\LVPrcSrv.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\Windows\system32\nvvsvc.exe
O23 - Service: PnkBstrA - Unknown owner - C:\Windows\system32\PnkBstrA.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\Cyberlink\Shared files\RichVideo.exe
O23 - Service: Steam Client Service - Valve Corporation - C:\Program Files\Common Files\Steam\SteamService.exe

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End of file - 6511 bytes

E' un problema del tuo firewall, ovvero non è un problema, quando compare l'avviso del programma Gdata, inserisci la spunta per non segnalarti più gli accessi da quell'indirizzo e non li vedrai più, ovvero il programma continua a bloccarli ma non ti presenta l'avviso, il firewall serve proprio a quello.

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alfonso_aiutamici@hotmail.it

Si il log è pulito.

Fai una copia di sistema con Macrium o Todo, cosi se hai problemi puoi risolverli in pochi minuti.

Leggi qui

http://www.aiutamici.com/ftp/software/PC_Sicuro_Guida.htm#7

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alfonso_aiutamici@hotmail.it