Esegui 
Ho fatto scansione con avast di sstema ed p risultato presente un rootkit su due file ( altri tre siili non letti da avast per impossibilta'). Ho provato a seguire la procedura ma è uscito solo un messaggioid errore 8Impossibile eliinarli o in qurantena). I file infetti erano di ccleaner in quell'istante.
Il istema operativo è windows 8.1.Esattamente avast diceva :
C:Program FIles\CCleaner\Lang|lang-1035.dll
" " " " 1063.dll
sospetti 1040 1030 2070.dll
Minaccia:Rootkit:hidden file minaccia elevata
Dopo poco che scaricavo tool antirootkit il computer ha inviato un messaggio di necessità si spegnimento.
Ho scollegato internet per impedire altro al rootkit.
ho scansionato ni modalita' provvisoria con tutti i tool che ho potuto scaricare ma nno hanno trovato nulla(malware bite, malware beta, aswmbr, tdskiller, kasperky tool antivirus, ifine rkill ma non hanno trovato nulla) Avast in modalita' provvisoria non funzionava.
Riavviato in modalità normale tramite msconfg (F8 non sembra dare effetti) avast apparentemente funzionava ma non scaricava aggiornamenti con messaggio di errore. Ho disinstallato ccleaner presunto infetto che poi aveva perso l alingua italiana e ho reinstallato, ora funziona regolarmente.
Ho scansionato ancora con i tool di nuovo in modalita' normale senza torvare nulla. Ho reinstallato avast e adesso funziona regolarmente. Ho scansionato il sistema con avast e non sono risultati virus o rootkit.
Inivo se possibile per un esame di nu esperto, il log fatto con Hjaking
Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 22:17:34, on 06/12/2015
Platform: Unknown Windows (WinNT 6.02.1008)
MSIE: Internet Explorer v11.0 (11.00.9600.17126)
FIREFOX: 42.0 (x86 it)
Boot mode: Normal
Running processes:
C:\Users\Luigi\Desktop\HijackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/p/?LinkId=255141
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/p/?LinkId=255141
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/p/?LinkId=255141
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=userinit.exe
O2 - BHO: ExplorerBHO Class - {449D0D6E-2412-4E61-B68F-1CB625CD9E52} - C:\Program Files\Classic Shell\ClassicExplorer32.dll
O2 - BHO: avast! Online Security - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: ClassicIEBHO Class - {EA801577-E6AD-4BD5-8F71-4BE0154331A4} - C:\Program Files\Classic Shell\ClassicIEDLL_32.dll
O3 - Toolbar: Classic Explorer Bar - {553891B7-A0D5-4526-BE18-D3CE461D6310} - C:\Program Files\Classic Shell\ClassicExplorer32.dll
O4 - HKLM\..\Run: [AvastUI.exe] "C:\Program Files\AVAST Software\Avast\AvastUI.exe" /nogui
O4 - HKCU\..\Run: [CCleaner Monitoring] "C:\Program Files\CCleaner\CCleaner64.exe" /MONITOR
O9 - Extra button: (no name) - {56753E59-AF1D-4FBA-9E15-31557124ADA2} - C:\Program Files\Classic Shell\ClassicIE_32.exe
O9 - Extra 'Tools' menuitem: Classic IE Settings - {56753E59-AF1D-4FBA-9E15-31557124ADA2} - C:\Program Files\Classic Shell\ClassicIE_32.exe
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O23 - Service: SAS Core Service (!SASCORE) - SUPERAntiSpyware.com - C:\Program Files\SUPERAntiSpyware\SASCORE64.EXE
O23 - Service: Acronis Scheduler2 Service (AcrSch2Svc) - Acronis - C:\Program Files (x86)\Common Files\Acronis\Schedule2\schedul2.exe
O23 - Service: Acronis Nonstop Backup Service (afcdpsrv) - Acronis - C:\Program Files (x86)\Common Files\Acronis\CDP\afcdpsrv.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: Avast Antivirus (avast! Antivirus) - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: Intel(R) Content Protection HECI Service (cphs) - Intel Corporation - C:\Windows\SysWow64\IntelCpHeciSvc.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\ieetwcollectorres.dll,-1000 (IEEtwCollectorService) - Unknown owner - C:\Windows\system32\IEEtwCollector.exe (file missing)
O23 - Service: Intel(R) HD Graphics Control Panel Service (igfxCUIService1.0.0.0) - Unknown owner - C:\Windows\system32\igfxCUIService.exe (file missing)
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: MBAMService - Unknown owner - C:\Program Files (x86)\Malwarebytes Anti-Malware\mbamservice.exe
O23 - Service: MIDISPORT Audio Device Monitor (MIDISPORTAudioDevMon) - M-Audio - C:\Program Files (x86)\M-Audio\MIDISPORT\AudioDevMon.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.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: @%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: Sandboxie Service (SbieSvc) - Sandboxie Holdings, LLC - C:\Program Files\Sandboxie\SbieSvc.exe
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: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: Acronis Sync Agent Service (syncagentsrv) - Acronis - C:\Program Files (x86)\Common Files\Acronis\SyncAgent\syncagentsrv.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.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: @%ProgramFiles%\Windows Defender\MpAsDesc.dll,-320 (WdNisSvc) - Unknown owner - C:\Program Files (x86)\Windows Defender\NisSrv.exe (file missing)
O23 - Service: @%ProgramFiles%\Windows Defender\MpAsDesc.dll,-310 (WinDefend) - Unknown owner - C:\Program Files (x86)\Windows Defender\MsMpEng.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)
--
End of file - 6652 bytes
grazie fin da ora per eventuali consigli
Da quello che capisco mi mancano alcuni file di sistema....posso provare a ripristinarli mediante il tool tweaking windows repair ola funzione ripair di windows 8.1 ma non so se conviene o meno...
