Trojaner-Board - win32.trojan.dropper in exlorer.exe

hallo,
ein freund hat sich einen trojaner eingefangen und sein antivirenprogramm avast schlägt immer wieder an und meldet, daß er sich keine sorgen machen muss. es kommt aber z.B. die meldung "explorer.exe is possibly infected with win32.trojan.dropper" und wohl auch noch andere meldungen, wie er sagt.

ich habe ihn aber ein logfile erstellen lassen und poste es hier mal. vielleicht kann ja jemand von euch daraus etwas erkennen?! oder ist es eh ratsam, die kiste einfach neu zu formatieren?!

viele grüße,
cruisi

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Logfile of HijackThis v1.99.1
Scan saved at 22:37:52, on 06.02.2007
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:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\msmapi32.exe
C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb04.exe
C:\Programme\Gemeinsame Dateien\ACD Systems\de\DevDetect.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\system32\lnwin.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Programme\Adobe\Acrobat 6.0\Distillr\acrotray.exe
C:\Programme\Logitech\MouseWare\system\em_exec.exe
C:\Programme\Alwil Software\Avast4\aswUpdSv.exe
C:\Programme\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\Programme\Alwil Software\Avast4\ashMaiSv.exe
C:\Programme\Alwil Software\Avast4\ashWebSv.exe
C:\Dokumente und Einstellungen\Jörg\Desktop\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.de/
O2 - BHO: (no name) - {00110011-4b0b-44d5-9718-90c88817369b} - (no file)
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programme\Adobe\Acrobat 6.0\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {086ae192-23a6-48d6-96ec-715f53797e85} - (no file)
O2 - BHO: (no name) - {11904ce8-632a-4856-a7cc-00b33fe71bd8} - (no file)
O2 - BHO: (no name) - {150fa160-130d-451f-b863-b655061432ba} - (no file)
O2 - BHO: (no name) - {15ACE85C-0BB1-42d1-9E32-07EB0506675A} - (no file)
O2 - BHO: (no name) - {17da0c9e-4a27-4ac5-bb75-5d24b8cdb972} - (no file)
O2 - BHO: (no name) - {1b68470c-2def-493b-8a4a-8e2d81be4ea5} - (no file)
O2 - BHO: (no name) - {1c4da27d-4d52-4465-a089-98e01bb725ca} - (no file)
O2 - BHO: (no name) - {1f48aa48-c53a-4e21-85e7-ac7cc6b5ffb1} - (no file)
O2 - BHO: (no name) - {1f48aa48-c53a-4e21-85e7-ac7cc6b5ffb2} - (no file)
O2 - BHO: (no name) - {202a961f-23ae-42b1-9505-ffe3c818d717} - (no file)
O2 - BHO: (no name) - {2d38a51a-23c9-48a1-a33c-48675aa2b494} - (no file)
O2 - BHO: (no name) - {2e246fae-8420-11d9-870d-000c2917de7f} - (no file)
O2 - BHO: (no name) - {2e9caff6-30c7-4208-8807-e79d4ec6f806} - (no file)
O2 - BHO: (no name) - {479fd0cf-5be9-4c63-8cda-b6d371c67bd5} - (no file)
O2 - BHO: (no name) - {5753791b-f607-48ca-814e-91c14d081f9e} - (no file)
O2 - BHO: (no name) - {7070a8f9-08a4-ca47-0ab0-1eb9e4ee1f3b} - (no file)
O2 - BHO: (no name) - {746455fe-d059-47e7-af0e-140e03f5a447} - (no file)
O2 - BHO: (no name) - {7a7e6d97-b492-4884-9abb-c31281dcc4f2} - (no file)
O2 - BHO: (no name) - {860c2f6b-ca82-4282-9187-beccbb66f0af} - (no file)
O2 - BHO: (no name) - {87185e78-a61b-4db3-965a-3235bbd7a622} - (no file)
O2 - BHO: (no name) - {8dc8f96d-34f7-1501-a2a4-631341aa3ac1} - (no file)
O2 - BHO: (no name) - {9c5875b8-93f3-429d-ff34-660b206d897a} - (no file)
O2 - BHO: (no name) - {a2595f37-48d0-46a1-9b51-478591a97764} - (no file)
O2 - BHO: (no name) - {a6f42cad-2559-48df-af30-89e480af5dfa} - (no file)
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programme\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: (no name) - {b212d577-05b7-4963-911e-4a8588160dfa} - (no file)
O2 - BHO: (no name) - {CA0E28FA-1AFD-4C21-A8DC-70EB5BE2F076} - (no file)
O2 - BHO: (no name) - {cf021f40-3e14-23a5-cba2-717765721306} - (no file)
O2 - BHO: (no name) - {d1ac752e-883f-4ed8-8828-b618c3a72152} - (no file)
O2 - BHO: (no name) - {e2b2b5a1-b48c-4886-a318-723916a01024} - (no file)
O2 - BHO: (no name) - {e2ddf680-9905-4dee-8c64-0a5de7fe133c} - (no file)
O2 - BHO: (no name) - {e3eebbe8-9cab-4c76-b26a-747e25ebb4c6} - (no file)
O2 - BHO: (no name) - {e6d5237d-a6c7-4c83-a67f-f9f15586fa62} - (no file)
O2 - BHO: (no name) - {e7afff2a-1b57-49c7-bf6b-e5123394c970} - (no file)
O2 - BHO: ASGP32.ASGP - {FA5B9933-1AE8-4A8D-9822-B20A6CA2B5EC} - C:\WINDOWS\system32\asgp32.dll
O2 - BHO: (no name) - {fcaddc14-bd46-408a-9842-cdbe1c6d37eb} - (no file)
O2 - BHO: (no name) - {fd9bc004-8331-4457-b830-4759ff704c22} - (no file)
O2 - BHO: (no name) - {fe2d25c1-c1db-4b5e-9390-af1cb5302f32} - (no file)
O2 - BHO: (no name) - {ff1bf4c7-4e08-4a28-a43f-9d60a9f7a880} - (no file)
O2 - BHO: (no name) - {FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF} - (no file)
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programme\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb04.exe
O4 - HKLM\..\Run: [Device Detector] DevDetect.exe -autorun
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [sysinter] C:\WINDOWS\system32\adirss.exe
O4 - HKLM\..\Run: [lnwin.exe] C:\WINDOWS\system32\lnwin.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NVMCTRAY.DLL,NvTaskbarInit
O4 - Global Startup: Acrobat Assistant.lnk = C:\Programme\Adobe\Acrobat 6.0\Distillr\acrotray.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programme\Gemeinsame Dateien\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programme\Microsoft Office\Office\OSA9.EXE
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programme\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programme\Messenger\msmsgs.exe
O23 - Service: Adobe LM Service - Unknown owner - C:\Programme\Gemeinsame Dateien\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Programme\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Programme\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Programme\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Programme\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe