Ho seguito le istruzioni: ho avviato in modalità provvisoria e, come Admin, ecco il log di HijackThis. Noto che non c'è C:\WINDOWS\System32\tss.exe

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MODALITA' PROVVISORIA

Logfile of HijackThis v1.97.7
Scan saved at 21.15.58, on 15/10/2004
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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:\WINDOWS\Explorer.EXE
C:\HijackThis.exe

O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb0 4.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [NAV Agent] C:\PROGRA~1\NORTON~2\navapw32.exe
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [SideWinderTrayV4] C:\PROGRA~1\MICROS~4\GAMECO~1\Common\SWTrayV4.exe
O4 - HKLM\..\Run: [CloneCDElbyCDFL] "C:\Programmi\Elaborate Bytes\CloneCD\ElbyCheck.exe" /L ElbyCDFL
O4 - HKLM\..\Run: [Realtime Audio Engine] mmrtkrnl.exe
O4 - HKLM\..\Run: [zBrowser Launcher] C:\Programmi\Logitech\iTouch\iTouch.exe
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Programmi\Messenger Plus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\jre1.5.0\bin\jusched.exe
O4 - HKLM\..\Run: [tapisys] C:\WINDOWS\System32\tss.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE
O4 - Global Startup: BTTray.lnk = ?
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Programmi\InterVideo\Common\Bin\WinCinemaMgr.ex e
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: NkvMon.exe.lnk = C:\Programmi\Nikon\NkView6\NkvMon.exe
O9 - Extra 'Tools' menuitem: Sun Java Console (HKLM)
O9 - Extra button: ICQ Pro (HKLM)
O9 - Extra 'Tools' menuitem: ICQ (HKLM)
O9 - Extra button: @btrez.dll,-4015 (HKLM)
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 (HKLM)
O16 - DPF: {166B1BCA-3F9C-11CF-8075-444553540000} (Shockwave ActiveX Control) - http://download.macromedia.com/pub/s...irector/sw.cab
O16 - DPF: {33564D57-0000-0010-8000-00AA00389B71} - http://download.microsoft.com/downlo...22/wmv9VCM.CAB
O16 - DPF: {8EC18CE2-D7B4-11D2-88C8-006008A717FD} (NCSView Class) - http://ww3.atlanteitaliano.it/ecwplugins/ncs.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/s...sh/swflash.cab
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Sempre da modalità provvisoria eseguo Sysclean come richiesto (ho limitato la scansione alla partizione che contiene OS e programmi, le altre sono solo dati).
Risultato (posto solo il finale del log):


Success Clean [ JAVA_BYTEVER.A]( 1) from C:\Documents and Settings\Alberto\Dati applicazioni\Sun\Java\Deployment\cache\javapi\v1.0 \file\Dummy.class-2838fca1-199bbdfb.class
Success Clean [JAVA_BYTEVER.A-1]( 1) from C:\Documents and Settings\Alberto\Dati applicazioni\Sun\Java\Deployment\cache\javapi\v1.0 \jar\ar3.jar-5ef20017-7f53d456.zip,(Gummy.class)
Success Clean [ TROJ_AGENT.EG]( 1) from C:\WINDOWS\LastGood\System32\polall1m.exe
Success Clean [ TROJ_AGENT.CA]( 1) from C:\WINDOWS\system32\mpefpx.exe
104512 files have been read.
104512 files have been checked.
65205 files have been scanned.
96635 files have been scanned. (including files in archived)
5 files containing viruses.
Found 5 viruses totally.
Maybe 0 viruses totally.
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Torno alla modalità normale e RITROVO C:\WINDOWS\System32\tss.exe (vedi log di HijackThis sottostante):

Logfile of HijackThis v1.97.7
Scan saved at 14.53.25, on 16/10/2004
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\WIDCOMM\Software Bluetooth\bin\btwdins.exe
C:\WINDOWS\System32\drivers\CDAC11BA.EXE
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmi\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb0 4.exe
C:\PROGRA~1\NORTON~2\navapw32.exe
C:\PROGRA~1\MICROS~4\GAMECO~1\Common\SWTrayV4.exe
C:\Programmi\Logitech\iTouch\iTouch.exe
C:\Programmi\Messenger Plus! 3\MsgPlus.exe
C:\Programmi\Java\jre1.5.0\bin\jusched.exe
C:\Programmi\Logitech\MouseWare\system\em_exec.exe
C:\Programmi\Creative\Shared Files\CamTray.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\WIDCOMM\Software Bluetooth\BTTray.exe
C:\Programmi\Nikon\NkView6\NkvMon.exe
C:\HijackThis.exe
C:\Programmi\Mozilla Firefox\firefox.exe

O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb0 4.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [NAV Agent] C:\PROGRA~1\NORTON~2\navapw32.exe
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [SideWinderTrayV4] C:\PROGRA~1\MICROS~4\GAMECO~1\Common\SWTrayV4.exe
O4 - HKLM\..\Run: [CloneCDElbyCDFL] "C:\Programmi\Elaborate Bytes\CloneCD\ElbyCheck.exe" /L ElbyCDFL
O4 - HKLM\..\Run: [Realtime Audio Engine] mmrtkrnl.exe
O4 - HKLM\..\Run: [zBrowser Launcher] C:\Programmi\Logitech\iTouch\iTouch.exe
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Programmi\Messenger Plus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\jre1.5.0\bin\jusched.exe
O4 - HKLM\..\Run: [tapisys] C:\WINDOWS\System32\tss.exe
O4 - HKLM\..\Run: [Creative WebCam Tray] C:\Programmi\Creative\Shared Files\CamTray.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [tapisys] C:\WINDOWS\System32\tss.exe
O4 - Global Startup: BTTray.lnk = ?
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Programmi\InterVideo\Common\Bin\WinCinemaMgr.ex e
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: NkvMon.exe.lnk = C:\Programmi\Nikon\NkView6\NkvMon.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra 'Tools' menuitem: Sun Java Console (HKLM)
O9 - Extra button: ICQ Pro (HKLM)
O9 - Extra 'Tools' menuitem: ICQ (HKLM)
O9 - Extra button: @btrez.dll,-4015 (HKLM)
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 (HKLM)
O16 - DPF: {166B1BCA-3F9C-11CF-8075-444553540000} (Shockwave ActiveX Control) - http://download.macromedia.com/pub/s...irector/sw.cab
O16 - DPF: {33564D57-0000-0010-8000-00AA00389B71} - http://download.microsoft.com/downlo...22/wmv9VCM.CAB
O16 - DPF: {8EC18CE2-D7B4-11D2-88C8-006008A717FD} (NCSView Class) - http://ww3.atlanteitaliano.it/ecwplugins/ncs.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/s...sh/swflash.cab
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Quindi ho corretto la voce corrispondente a C:\WINDOWS\System32\tss.exe
PERò il file non si trova nella cartella \System32\ !!!

GRAZIE PER L'AIUTO!!!