Looking around it seems like the fake svchost.exe is located in the C:\WINDOWS\System32\drivers directory -- the file was created at the same time the problems began. I downloaded and ran Symantec's Blaster Worm fix tool (as I thought that was the malware in question), but that didn't find anything. Nor does AVG react to the file. So, here I am!
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 17:38:31, on 2008-06-04
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2800.1106)
Boot mode: Normal
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:\WINDOWS\SOUNDMAN.EXE
C:\Program\Grisoft\AVG7\avgcc.exe
C:\WINDOWS\System32\ctfmon.exe
C:\WINDOWS\System32\drivers\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program\SpywareGuard\sgmain.exe
C:\Program\SpywareGuard\sgbhp.exe
C:\Program\Grisoft\AVG7\avgamsvr.exe
C:\Program\Grisoft\AVG7\avgupsvc.exe
C:\Program\Grisoft\AVG7\avgemc.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program\Canon\CAL\CALMAIN.exe
C:\Program\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINDOWS\System32\ZoneLabs\vsmon.exe
C:\Program\Trend Micro\HijackThis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Länkar
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SpywareGuard Download Protection - {4A368E80-174F-4872-96B5-0B27DDD11DB2} - C:\Program\SpywareGuard\dlprotect.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [ZoneAlarm Client] "C:\Program\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [RoxioEngineUtility] "C:\Program\Delade filer\Roxio Shared\System\EngUtil.exe"
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE NvQTwk,NvCplDaemon initialize
O4 - HKLM\..\Run: [AVG7_CC] C:\Program\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [SVCHOST.EXE] C:\WINDOWS\System32\drivers\svchost.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'LOKAL TJÄNST')
O4 - HKUS\S-1-5-19\..\Run: [AVG7_Run] C:\Program\Grisoft\AVG7\avgw.exe /RUNONCE (User 'LOKAL TJÄNST')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'NETWORK SERVICE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [RunNarrator] Narrator.exe (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [RunNarrator] Narrator.exe (User 'Default user')
O4 - Startup: SpywareGuard.lnk = C:\Program\SpywareGuard\sgmain.exe
O4 - Global Startup: Adobe Gamma Loader.exe.lnk = C:\Program\Delade filer\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program\Delade filer\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\Program\MICROS~2\Office10\EXCEL.EXE/3000
O16 - DPF: {0EB0E74A-2A76-4AB3-A7FB-9BD8C29F7F75} (CKAVWebScan Object) - http://www.kaspersky...can_unicode.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.micros...b?1122684707296
O16 - DPF: {67DABFBF-D0AB-41FA-9C46-CC0F21721616} - http://go.divx.com/p...owserPlugin.cab
O16 - DPF: {6E5A37BF-FD42-463A-877C-4EB7002E68AE} (Trend Micro ActiveX Scan Agent 6.5) - http://housecall65.t...ivex/hcImpl.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoft...free/asinst.cab
O23 - Service: Adobe LM Service - Unknown owner - C:\Program\Delade filer\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\Program\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\Program\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\Program\Grisoft\AVG7\avgemc.exe
O23 - Service: Canon Camera Access Library 8 (CCALib8) - Canon Inc. - C:\Program\Canon\CAL\CALMAIN.exe
O23 - Service: Indexing Service (CiSvc) - Unknown owner - C:\WINDOWS\system32\cisvc.exe (file missing)
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe
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End of file - 4829 bytes