Riguardo al worm -in specifico- eccoti informazioni e notizie complete (possibilità di rimozione incluse):
http://www.symantec.com/region/it/techsupp/avcenter/venc/data/it-w32.spybot.worm.html
Il tutto in lingua italiana e a cura della Symantec Corporation.

Riguardo al backdoor -in specifico- eccoti informazioni e notizie (possibilità di rimozione inclusa):
http://www.sophos.com/security/analyses/trojspybotc.html

Il tutto in lingua inglese e a cura della Sophos.

Ho fatto una scansione antivirus in modalità provvisoria e disattivando il ripristino di sistema.Sono stati eliminati due virus e la differenza del log che riallego sono la terzultima e ultima voce che appare (file missing).Lascio così o le elimino.Grazie.
Logfile of HijackThis v1.99.1
Scan saved at 14.45.59, on 06/03/2007
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:\Programmi\File comuni\Symantec Shared\ccEvtMgr.exe
C:\Programmi\Norton Internet Security\NISUM.EXE
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\RunDll32.exe
C:\PROGRA~1\B'SCLI~1\Win2K\BSCLIP.exe
C:\Programmi\File comuni\Symantec Shared\ccApp.exe
C:\Programmi\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
C:\WINDOWS\ZSSnp211.exe
C:\WINDOWS\Domino.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Adobe\Acrobat 5.0\Distillr\AcroTray.exe
C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
C:\Programmi\Alice ti aiuta\bin\mpbtn.exe
C:\Programmi\Sony Corporation\Image Transfer\SonyTray.exe
C:\Programmi\Nikon\NkView6\NkvMon.exe
C:\WINDOWS\system32\RAMASST.exe
C:\Programmi\CaptureWiz\Pro\CaptureWiz.exe
C:\Programmi\Norton Internet Security\ccPxySvc.exe
C:\WINDOWS\System32\DVDRAMSV.exe
C:\Programmi\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\HP\Digital Imaging\bin\hpqSTE08.exe
C:\Programmi\HP\Digital Imaging\Product Assistant\bin\hprblog.exe
C:\Documents and Settings\Preinstalled User\Documenti\hijackthis1.99\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://it.my.yahoo.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Acrobat\ActiveX\AcroIEHelper.ocx
O2 - BHO: FlpLauncher Class - {4401FDC3-7996-4774-8D2B-C1AE9CD6CC25} - C:\Programmi\E-Book Systems\FlipAlbum 5 Pro\FpLaunch.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd
O4 - HKLM\..\Run: [SplashDisplayer] C:\WINDOWS\System32\ISTHTB.EXE
O4 - HKLM\..\Run: [B'sCLiP] C:\PROGRA~1\B'SCLI~1\Win2K\BSCLIP.exe
O4 - HKLM\..\Run: [ccApp] C:\Programmi\File comuni\Symantec Shared\ccApp.exe
O4 - HKLM\..\Run: [ccRegVfy] C:\Programmi\File comuni\Symantec Shared\ccRegVfy.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [ATIPTA] C:\Programmi\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [HP Software Update] C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [ZSSnp211] C:\WINDOWS\ZSSnp211.exe
O4 - HKLM\..\Run: [Domino] C:\WINDOWS\Domino.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Startup: APO Usb Autorun.lnk = K:\APO Usb Autorun\usb_autorun.exe
O4 - Startup: CaptureWiz.lnk = C:\Programmi\CaptureWiz\Pro\CaptureWiz.exe
O4 - Global Startup: Acrobat Assistant.lnk = C:\Programmi\Adobe\Acrobat 5.0\Distillr\AcroTray.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: Image Transfer.lnk = ?
O4 - Global Startup: NkvMon.exe.lnk = C:\Programmi\Nikon\NkView6\NkvMon.exe
O4 - Global Startup: RAMASST.lnk = C:\WINDOWS\system32\RAMASST.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Open using &Advanced JPEG Compressor - C:\Programmi\Advanced JPEG Compressor\ajcieex.htm
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O16 - DPF: {745395C8-D0E1-4227-8586-624CA9A10A8D} (AxisMediaControl Class) - http://217.127.161.76:8035/activex/AMC.cab
O16 - DPF: {917623D1-D8E5-11D2-BE8B-00104B06BDE3} (CamImage Class) - http://webcam.linnea.net/activex/AxisCamControl.cab
O16 - DPF: {DE625294-70E6-45ED-B895-CFFA13AEB044} (AxisMediaControlEmb Class) - http://213.115.192.146/activex/AMC.cab
O23 - Service: Adobe LM Service - Unknown owner - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\System32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation Service (ccPwdSvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Proxy Service (ccPxySvc) - Symantec Corporation - C:\Programmi\Norton Internet Security\ccPxySvc.exe
O23 - Service: DVD-RAM_Service - Matsushita Electric Industrial Co., Ltd. - C:\WINDOWS\System32\DVDRAMSV.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Servizio Norton AntiVirus Auto-Protect (navapsvc) - Symantec Corporation - C:\Programmi\Norton AntiVirus\navapsvc.exe
O23 - Service: Norton Internet Security Accounts Manager (NISUM) - Symantec Corporation - C:\Programmi\Norton Internet Security\NISUM.EXE
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\FILECO~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Windows System Service (SYSTEMSVC) - Unknown owner - C:\WINDOWS\system\system.exe (file missing)
O23 - Service: TuneUp WinStyler Theme Service (TUWinStylerThemeSvc) - TuneUp Software GmbH - C:\Programmi\TuneUp Utilities 2006\WinStylerThemeSvc.exe
O23 - Service: Windows Instrument Driver (WMID) - Unknown owner - C:\WINDOWS\instdrv.exe (file missing)