dialup phone number is being changed (possible TR/Dldr.PurityS.E.2)

This time it is my friends computer.
Here goes how did it all started.
One day last week AV software reported virus TR/Dldr.PurityS.E.2 in archive MediaInstaller[1].cab that was found in Temporary Internet files. File was deleted that moment. After that phone number in DialUp settings was changed to some strange number (something like: 0043...). I've changed that number. But when IE was started that odd number was again in settings (default IE home page was about:blank). I've changed home page to google.com and everything was fine, even after restart of windows. But next morning same thing happened...that number was back!

And AV software reports this message randomly:

c:\windows\system32\explorer.exe

This file contains suspicius code Heuristic/Trojan.Downloader!

And when I try to print from Outlook or IE same message appears!

New virus definition file and updated version of AV is installed. After scanning nothing was found.
Please help.

Here is HijackThis log:

Logfile of HijackThis v1.97.7
Scan saved at 21:48:35, on 24.10.2004
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:\WINDOWS\system32\spoolsv.exe
C:\Program Files\AVPersonal\AVGUARD.EXE
C:\Program Files\AVPersonal\AVWUPSRV.EXE
C:\Program Files\Executive Software\Diskeeper Home Edition\DKService.exe
C:\Program Files\Common Files\EPSON\EBAPI\SAgent2.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\Tablet.exe
C:\Program Files\AVPersonal\AVSched32.EXE
C:\Program Files\Logitech\iTouch\iTouch.exe
C:\Program Files\MUSICMATCH\MUSICMATCH Jukebox\mm_tray.exe
C:\Program Files\MSN Apps\Updater\01.02.3000.1001\en-us\msnappau.exe
C:\WINDOWS\system32\explorer.exe
C:\Program Files\AVPersonal\AVGNT.EXE
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\Logitech\Desktop Messenger\8876480\Program\BackWeb-8876480.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
S:\virus\HijackThis.exe

R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - d:\Adobe\Acrobat 5.0\Acrobat\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - C:\Program Files\MSN Apps\ST\01.02.3000.1002\en-xu\stmain.dll
O2 - BHO: (no name) - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Apps\MSN Toolbar\01.02.3000.1001\en-us\msntb.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Apps\MSN Toolbar\01.02.3000.1001\en-us\msntb.dll
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [AVSCHED32] C:\Program Files\AVPersonal\AVSched32.EXE /min
O4 - HKLM\..\Run: [zBrowser Launcher] C:\Program Files\Logitech\iTouch\iTouch.exe
O4 - HKLM\..\Run: [MMTray] C:\Program Files\MUSICMATCH\MUSICMATCH Jukebox\mm_tray.exe
O4 - HKLM\..\Run: [msnappau] "C:\Program Files\MSN Apps\Updater\01.02.3000.1001\en-us\msnappau.exe"
O4 - HKLM\..\Run: [explorer] C:\WINDOWS\system32\explorer.exe -go -c26 -w
O4 - HKLM\..\Run: [AVGCtrl] C:\Program Files\AVPersonal\AVGNT.EXE /min
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [LDM] C:\Program Files\Logitech\Desktop Messenger\8876480\Program\BackWeb-8876480.exe
O4 - Global Startup: EPSON Status Monitor 3 Environment Check 2.lnk = C:\WINDOWS\system32\spool\drivers\w32x86\3\E_SRCV02.EXE
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O8 - Extra context menu item: I&zvoz u Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: Related (HKLM)
O9 - Extra 'Tools' menuitem: Show &Related Links (HKLM)
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Messenger (HKLM)
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {11111111-1111-1111-1111-111111113457} - file://c:\ied_s7m.cab
O16 - DPF: {11111111-1111-1111-1111-511111113457} - file://c:\x.cab
O16 - DPF: {11111111-1111-1111-1111-511111113458} - file://c:\x.cab
O16 - DPF: {69FD62B1-0216-4C31-8D55-840ED86B7C8F} - http://installs.hotbar.com/installs/hotbar/programs/hotbar.cab
O16 - DPF: {78AF2F24-A9C3-11D3-BF8C-0060B0FCC122} (AcDcToday Control) - file://D:\AutoCAD 2002\AcDcToday.ocx
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} (Update Class) - http://v4.windowsupdate.microsoft.com/CAB/x86/unicode/iuctl.CAB?37669.48125
O16 - DPF: {AE563720-B4F5-11D4-A415-00108302FDFD} (NOXLATE-BANR) - file://D:\AutoCAD 2002\InstBanr.ocx
O16 - DPF: {C6637286-300D-11D4-AE0A-0010830243BD} (InstaFred) - file://D:\AutoCAD 2002\InstFred.ocx
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O16 - DPF: {F281A59C-7B65-11D3-8617-0010830243BD} (AcPreview Control) - file://D:\AutoCAD 2002\AcPreview.ocx


Thanks.

Hi ivanapmf,

Let's start here:

Download Stinger. Save it to your Desktop. Double-click it to start it. Make sure all of your drives are listed in the "Directories to scan" box (C:\ D:\ E:\, etc.). Click the Scan Now button and let it remove anything it finds.

http://vil.nai.com/vil/stinger/

Next...

Perform an onlne virus scan from this site:

Trend Micro Housecall - Again, select all of your drives to be scanned. Please check "Auto clean" before scanning.

http://housecall.trendmicro.com/

If you can, copy and paste the report logs from the scans into your next post.

Next....

Please update HijackThis, you are using an outdated version:

Open HijackThis, click Config > Misc Tools > Check for Update online

Or download a copy of version 1.98.2 at:

http://www.majorgeeks.com/download3155.html

Post a fresh log with this new version.

Tom