qualche giorno fa ho scritto sul forum perchè avevo il pc con 2 virus+il bla.exe..ho seguito tutta la procedura che mi avete consigliato e alla fine il pc è risultato pulito..ma stamattina..vado in C:...ed eccolo lì di nuo il bla.exe...come devo fare per non farlo tornare più?
ho fatto la scansione con hijackthis e vi posto il log..sperando che ci sia una soluzione..

Logfile of HijackThis v1.99.1
Scan saved at 10.06.45, on 30/05/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Sygate\SPF\smc.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\MsPMSPSv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Java\j2re1.4.2_03\bin\jusched.exe
C:\windows\system\hpsysdrv.exe
C:\HP\KBD\KBD.EXE
C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\WINDOWS\AGRSMMSG.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\Roxio\Easy CD Creator 6\DragToDisc\DrgToDsc.exe
C:\Programmi\Roxio\Easy CD Creator 6\AudioCentral\RxMon.exe
C:\Programmi\File comuni\Logitech\QCDriver2\LVCOMS.EXE
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\Roxio\Easy CD Creator 6\AudioCentral\Playlist.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\Logitech\ImageStudio\LogiTray.exe
C:\Programmi\Adobe\Acrobat 6.0\Distillr\acrotray.exe
C:\Programmi\ADSL\StarModem ADSL USB MODEM\dslmon.exe
C:\Programmi\StopDialers\StopDialers.exe
C:\Programmi\eMule\emule.exe
C:\Programmi\MSN Messenger\msnmsgr.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Outlook Express\msimn.exe
C:\Programmi\Messenger\msmsgs.exe
C:\WINDOWS\system32\taskmgr.exe
C:\Programmi\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 6.0\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\j2re1.4.2_03\bin\jusched.exe
O4 - HKLM\..\Run: [hpsysdrv] c:\windows\system\hpsysdrv.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [KBD] C:\HP\KBD\KBD.EXE
O4 - HKLM\..\Run: [ISUSPM Startup] C:\PROGRA~1\FILECO~1\INSTAL~1\UPDATE~1\ISUSPM.exe -startup
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [iTunesHelper] C:\Programmi\iTunes\iTunesHelper.exe
O4 - HKLM\..\Run: [Recguard] C:\WINDOWS\SMINST\RECGUARD.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /installquiet /keeploaded /nodetect
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [PS2] C:\WINDOWS\system32\ps2.exe
O4 - HKLM\..\Run: [LSBWatcher] c:\hp\drivers\hplsbwatcher\lsburnwatcher.exe
O4 - HKLM\..\Run: [RoxioEngineUtility] "C:\Programmi\File comuni\Roxio Shared\System\EngUtil.exe"
O4 - HKLM\..\Run: [RoxioDragToDisc] "C:\Programmi\Roxio\Easy CD Creator 6\DragToDisc\DrgToDsc.exe"
O4 - HKLM\..\Run: [RoxioAudioCentral] "C:\Programmi\Roxio\Easy CD Creator 6\AudioCentral\RxMon.exe"
O4 - HKLM\..\Run: [LVCOMS] C:\Programmi\File comuni\Logitech\QCDriver2\LVCOMS.EXE
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\Sygate\SPF\smc.exe -startgui
O4 - HKLM\..\Run: [LogitechGalleryRepair] C:\Programmi\Logitech\ImageStudio\ISStart.exe
O4 - HKLM\..\Run: [LogitechImageStudioTray] C:\Programmi\Logitech\ImageStudio\LogiTray.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Programmi\MSN Messenger\MsnMsgr.Exe" /background
O4 - Startup: Stop Dialers.lnk = C:\Programmi\StopDialers\StopDialers.exe
O4 - Global Startup: Acrobat Assistant.lnk = C:\Programmi\Adobe\Acrobat 6.0\Distillr\acrotray.exe
O4 - Global Startup: DSLMON.lnk = ?
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Programmi\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~3\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\j2re1.4.2_03\bin\npjpi142_03.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\j2re1.4.2_03\bin\npjpi142_03.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Organizzatore ricerche - {9455301C-CF6B-11D3-A266-00C04F689C50} - C:\Programmi\File comuni\Microsoft Shared\Encarta Researcher\EROPROJ.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O16 - DPF: {00B71CFB-6864-4346-A978-C0A14556272C} (Checkers Class) - http://messenger.zone.msn.com/binary/msgrchkr.cab31267.cab
O16 - DPF: {2917297F-F02B-4B9D-81DF-494B6333150B} (Minesweeper Flags Class) - http://messenger.zone.msn.com/binary/MineSweeper.cab31267.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/msnmessengersetupdownloader.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{A5EE54A4-6F67-484F-A9F5-1176859B0EC4}: NameServer = 193.70.152.15 193.70.152.25
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: Servizio iPod (iPodService) - Apple Computer, Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Sygate Personal Firewall (SmcService) - Sygate Technologies, Inc. - C:\Programmi\Sygate\SPF\smc.exe

Il log e pulito, ma se ci sono virus nel sistema non si possono vedere dal log, prova a fare un controllo antivirus da questo indirizzo
http://security.symantec.com/default.asp?productid=symhome&langid=it&venid=sym

se la scansione rileva virus, significa che il tuo antivirus non é efficace e conviene formattare per reinstallare tutto a nuovo.

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Collaboratore Aiutamici

sto facendo la scansione online con McAfee e mi ha trovato il virus Downloader-YL in questo file C:\...\my.class-dc825cc-367b97cb.class
come posso fare per rimuoverlo?è proprio necessaria la formattazione?

a proposito, mi sapresti consigliare un buon antivirus free? io ho l'Avast..ma a quanto pare non funziona granchè..