Trojan podszywajacy sie pod winlogon.exe?

[Lukasz234 (Łukasz234)]

Dopiero co przeinstalowalem system, łatki, zainstalowalem firewalla, AV i antyspyware i ku mojemu zdziwieniu program a-squared wykrywa rzekomo jakiegos trojana :o .Troche to dziwne zwazywszy na swiezy system i “aseptyczna” instalacje. Czy to false alarm? Załączam log z a-squared i logi z Hijack i silent runners:

a-squared Free - Version 2.1


Skanowanie ustawień:


Obiekty: Pamięć, Ślady, Ciasteczka, C:\WINDOWS\, C:\Program Files

Skanowanie archiwów: Wł.

Heurystyka: Wł.

Skanowanie reklam: Wł.


Uruchomione skanowanie:	2007-02-07 09:35:25


C:\WINDOWS\$NtServicePackUninstall$\winlogon.exe wykryto: Trojan.Win32.Agent.gq


Zeskanowano


Pliki: 14552

Ślady: 96897

Ciasteczka: 8

Procesy: 33


Znaleziono


Pliki: 1

Ślady: 0

Ciasteczka: 0

Procesy: 0

Klucze rejestru: 0


Zakończono skanowanie:	2007-02-07 10:06:18

Scan time:	00:30:53

Hijack:

Logfile of HijackThis v1.99.1

Scan saved at 10:30:53, on 2007-02-07

Platform: Windows XP Dodatek SP2 (WinNT 5.01.2600)

MSIE: Internet Explorer v7.00 (7.00.5730.0011)


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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe

C:\Program Files\Alwil Software\Avast4\ashServ.exe

C:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe

C:\WINDOWS\System32\nvsvc32.exe

C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe

C:\Program Files\Sunbelt Software\Personal Firewall\kpf4gui.exe

C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe

C:\Program Files\Alwil Software\Avast4\ashWebSv.exe

C:\WINDOWS\Explorer.EXE

C:\Program Files\Sunbelt Software\Personal Firewall\kpf4gui.exe

C:\WINDOWS\system32\RUNDLL32.EXE

C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe

C:\Program Files\QuickTime\qttask.exe

C:\Program Files\Webroot\Spy Sweeper\SpySweeperUI.exe

C:\WINDOWS\system32\ctfmon.exe

C:\Program Files\Google\GoogleToolbarNotifier\1.0.720.3640\GoogleToolbarNotifier.exe

C:\WINDOWS\system32\devldr32.exe

C:\Program Files\Logitech\MouseWare\system\em_exec.exe

C:\Program Files\Internet Explorer\iexplore.exe

C:\Program Files\WinRAR\WinRAR.exe

C:\DOCUME~1\Lukasz\USTAWI~1\Temp\Rar$EX00.893\HijackThis.exe


R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896

R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Łącza

O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll

O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll

O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll

O4 - HKLM\..\Run: [NvCplDaemon] "RUNDLL32.EXE" C:\WINDOWS\System32\NvCpl.dll,NvStartup

O4 - HKLM\..\Run: [nwiz] "nwiz.exe" /install

O4 - HKLM\..\Run: [NvMediaCenter] "RUNDLL32.EXE" C:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit

O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe

O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe

O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime

O4 - HKLM\..\Run: [SpySweeper] C:\Program Files\Webroot\Spy Sweeper\SpySweeperUI.exe /startintray

O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe

O4 - HKCU\..\Run: [swg] "C:\Program Files\Google\GoogleToolbarNotifier\1.0.720.3640\GoogleToolbarNotifier.exe"

O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Reader 8.0\Reader\reader_sl.exe

O4 - Global Startup: Adobe Reader Synchronizer.lnk = C:\Program Files\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe

O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)

O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)

O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe

O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe

O11 - Options group: [INTERNATIONAL] International*

O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1170691921879

O20 - Winlogon Notify: WRNotifier - C:\WINDOWS\SYSTEM32\WRLogonNTF.dll

O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe

O23 - Service: avast! Antivirus - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashServ.exe

O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)

O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)

O23 - Service: Sunbelt Kerio Personal Firewall 4 (KPF4) - Sunbelt Software - C:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe

O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe

O23 - Service: Webroot Spy Sweeper Engine (WebrootSpySweeperService) - Webroot Software, Inc. - C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe

Silent runners:

"Silent Runners.vbs", revision R50, http://www.silentrunners.org/

Operating System: Windows XP SP2

Output limited to non-default values, except where indicated by "{++}"



Startup items buried in registry:

---------------------------------


HKCU\Software\Microsoft\Windows\CurrentVersion\Run\ {++}

"CTFMON.EXE" = "C:\WINDOWS\system32\ctfmon.exe" [MS]

"swg" = ""C:\Program Files\Google\GoogleToolbarNotifier\1.0.720.3640\GoogleToolbarNotifier.exe"" ["Google Inc."]


HKLM\Software\Microsoft\Windows\CurrentVersion\Run\ {++}

"NvCplDaemon" = ""RUNDLL32.EXE" C:\WINDOWS\System32\NvCpl.dll,NvStartup" [MS]

"nwiz" = ""nwiz.exe" /install" ["NVIDIA Corporation"]

"NvMediaCenter" = ""RUNDLL32.EXE" C:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit" [MS]

"avast!" = "C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe" [null data]

"Logitech Utility" = "Logi_MwX.Exe" ["Logitech Inc."]

"QuickTime Task" = ""C:\Program Files\QuickTime\qttask.exe" -atboottime" ["Apple Computer, Inc."]

"SpySweeper" = "C:\Program Files\Webroot\Spy Sweeper\SpySweeperUI.exe /startintray" ["Webroot Software, Inc."]


HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\

{06849E9F-C8D7-4D59-B87D-784B7D6BE0B3}\(Default) = (no title provided)

  -> {HKLM...CLSID} = "Adobe PDF Reader Link Helper"

                   \InProcServer32\(Default) = "C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll" ["Adobe Systems Incorporated"]

{AA58ED58-01DD-4d91-8333-CF10577473F7}\(Default) = (no title provided)

  -> {HKLM...CLSID} = "Google Toolbar Helper"

                   \InProcServer32\(Default) = "c:\program files\google\googletoolbar1.dll" ["Google Inc."]


HKLM\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\

"{42071714-76d4-11d1-8b24-00a0c9068ff3}" = "Rozszerzenie CPL kadrowania wyświetlania"

  -> {HKLM...CLSID} = "Rozszerzenie CPL kadrowania wyświetlania"

                   \InProcServer32\(Default) = "deskpan.dll" [file not found]

"{88895560-9AA2-1069-930E-00AA0030EBC8}" = "Rozszerzenie ikony HyperTerminalu"

  -> {HKLM...CLSID} = "HyperTerminal Icon Ext"

                   \InProcServer32\(Default) = "C:\WINDOWS\System32\hticons.dll" ["Hilgraeve, Inc."]

"{A70C977A-BF00-412C-90B7-034C51DA2439}" = "NvCpl DesktopContext Class"

  -> {HKLM...CLSID} = "DesktopContext Class"

                   \InProcServer32\(Default) = "C:\WINDOWS\System32\nvcpl.dll" ["NVIDIA Corporation"]

"{FFB699E0-306A-11d3-8BD1-00104B6F7516}" = "Play on my TV helper"

  -> {HKLM...CLSID} = "NVIDIA CPL Extension"

                   \InProcServer32\(Default) = "C:\WINDOWS\System32\nvcpl.dll" ["NVIDIA Corporation"]

"{1CDB2949-8F65-4355-8456-263E7C208A5D}" = "Desktop Explorer"

  -> {HKLM...CLSID} = "Desktop Explorer"

                   \InProcServer32\(Default) = "C:\WINDOWS\System32\nvshell.dll" ["NVIDIA Corporation"]

"{1E9B04FB-F9E5-4718-997B-B8DA88302A47}" = "Desktop Explorer Menu"

  -> {HKLM...CLSID} = (no title provided)

                   \InProcServer32\(Default) = "C:\WINDOWS\System32\nvshell.dll" ["NVIDIA Corporation"]

"{1E9B04FB-F9E5-4718-997B-B8DA88302A48}" = "nView Desktop Context Menu"

  -> {HKLM...CLSID} = "nView Desktop Context Menu"

                   \InProcServer32\(Default) = "C:\WINDOWS\System32\nvshell.dll" ["NVIDIA Corporation"]

"{472083B0-C522-11CF-8763-00608CC02F24}" = "avast"

  -> {HKLM...CLSID} = "avast"

                   \InProcServer32\(Default) = "C:\Program Files\Alwil Software\Avast4\ashShell.dll" ["ALWIL Software"]

"{7C9D5882-CB4A-4090-96C8-430BFE8B795B}" = "Webroot Spy Sweeper Context Menu Integration"

  -> {HKLM...CLSID} = "Webroot Spy Sweeper Context Menu Integration"

                   \InProcServer32\(Default) = "C:\PROGRA~1\Webroot\SPYSWE~1\SSCtxMnu.dll" ["Webroot Software, Inc."]

"{B41DB860-8EE4-11D2-9906-E49FADC173CA}" = "WinRAR shell extension"

  -> {HKLM...CLSID} = "WinRAR"

                   \InProcServer32\(Default) = "C:\Program Files\WinRAR\rarext.dll" [null data]

"{A155339D-CCCD-4714-85EB-3754B804C9DF}" = "a-squared Free Context Menu Shell Extension"

  -> {HKLM...CLSID} = "a-squared Free Context Menu"

                   \InProcServer32\(Default) = "C:\PROGRA~1\A-SQUA~1\A2FREE~1.DLL" ["Emsi Software GmbH"]


HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\

<> WRNotifier\DLLName = "WRLogonNTF.dll" ["Webroot Software, Inc."]


HKLM\Software\Classes\Folder\shellex\ColumnHandlers\

{F9DB5320-233E-11D1-9F84-707F02C10627}\(Default) = "PDF Column Info"

  -> {HKLM...CLSID} = "PDF Shell Extension"

                   \InProcServer32\(Default) = "C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\PDFShell.dll" ["Adobe Systems, Inc."]


HKLM\Software\Classes\*\shellex\ContextMenuHandlers\

avast\(Default) = "{472083B0-C522-11CF-8763-00608CC02F24}"

  -> {HKLM...CLSID} = "avast"

                   \InProcServer32\(Default) = "C:\Program Files\Alwil Software\Avast4\ashShell.dll" ["ALWIL Software"]

WinRAR\(Default) = "{B41DB860-8EE4-11D2-9906-E49FADC173CA}"

  -> {HKLM...CLSID} = "WinRAR"

                   \InProcServer32\(Default) = "C:\Program Files\WinRAR\rarext.dll" [null data]


HKLM\Software\Classes\Directory\shellex\ContextMenuHandlers\

WinRAR\(Default) = "{B41DB860-8EE4-11D2-9906-E49FADC173CA}"

  -> {HKLM...CLSID} = "WinRAR"

                   \InProcServer32\(Default) = "C:\Program Files\WinRAR\rarext.dll" [null data]


HKLM\Software\Classes\Folder\shellex\ContextMenuHandlers\

a2FreeContMenu\(Default) = "{A155339D-CCCD-4714-85EB-3754B804C9DF}"

  -> {HKLM...CLSID} = "a-squared Free Context Menu"

                   \InProcServer32\(Default) = "C:\PROGRA~1\A-SQUA~1\A2FREE~1.DLL" ["Emsi Software GmbH"]

avast\(Default) = "{472083B0-C522-11CF-8763-00608CC02F24}"

  -> {HKLM...CLSID} = "avast"

                   \InProcServer32\(Default) = "C:\Program Files\Alwil Software\Avast4\ashShell.dll" ["ALWIL Software"]

SpySweeper\(Default) = "{7C9D5882-CB4A-4090-96C8-430BFE8B795B}"

  -> {HKLM...CLSID} = "Webroot Spy Sweeper Context Menu Integration"

                   \InProcServer32\(Default) = "C:\PROGRA~1\Webroot\SPYSWE~1\SSCtxMnu.dll" ["Webroot Software, Inc."]

WinRAR\(Default) = "{B41DB860-8EE4-11D2-9906-E49FADC173CA}"

  -> {HKLM...CLSID} = "WinRAR"

                   \InProcServer32\(Default) = "C:\Program Files\WinRAR\rarext.dll" [null data]


HKLM\Software\Classes\AllFilesystemObjects\shellex\ContextMenuHandlers\

a2FreeContMenu\(Default) = "{A155339D-CCCD-4714-85EB-3754B804C9DF}"

  -> {HKLM...CLSID} = "a-squared Free Context Menu"

                   \InProcServer32\(Default) = "C:\PROGRA~1\A-SQUA~1\A2FREE~1.DLL" ["Emsi Software GmbH"]

SpySweeper\(Default) = "{7C9D5882-CB4A-4090-96C8-430BFE8B795B}"

  -> {HKLM...CLSID} = "Webroot Spy Sweeper Context Menu Integration"

                   \InProcServer32\(Default) = "C:\PROGRA~1\Webroot\SPYSWE~1\SSCtxMnu.dll" ["Webroot Software, Inc."]



Group Policies {policy setting}:

--------------------------------


Note: detected settings may not have any effect.


HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\


"shutdownwithoutlogon" = (REG_DWORD) hex:0x00000001

{Shutdown: Allow system to be shut down without having to log on}


"undockwithoutlogon" = (REG_DWORD) hex:0x00000001

{Devices: Allow undock without having to log on}



Active Desktop and Wallpaper:

-----------------------------


Active Desktop may be disabled at this entry:

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ShellState


Displayed if Active Desktop enabled and wallpaper not set by Group Policy:

HKCU\Software\Microsoft\Internet Explorer\Desktop\General\

"Wallpaper" = "C:\WINDOWS\system32\config\systemprofile\Ustawienia lokalne\Dane aplikacji\Microsoft\Wallpaper1.bmp"


Displayed if Active Desktop disabled and wallpaper not set by Group Policy:

HKCU\Control Panel\Desktop\

"Wallpaper" = "C:\Documents and Settings\Lukasz\Ustawienia lokalne\Dane aplikacji\Microsoft\Wallpaper1.bmp"



Enabled Screen Saver:

---------------------


HKCU\Control Panel\Desktop\

"SCRNSAVE.EXE" = "C:\WINDOWS\System32\logon.scr" [MS]



Startup items in "Lukasz" & "All Users" startup folders:

--------------------------------------------------------


C:\Documents and Settings\All Users\Menu Start\Programy\Autostart

"Adobe Reader Speed Launch" -> shortcut to: "C:\Program Files\Adobe\Reader 8.0\Reader\reader_sl.exe" ["Adobe Systems Incorporated"]

"Adobe Reader Synchronizer" -> shortcut to: "C:\Program Files\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe" [null data]



Enabled Scheduled Tasks:

------------------------


"AppleSoftwareUpdate" -> launches: "C:\Program Files\Apple Software Update\SoftwareUpdate.exe -Task" ["Apple Computer, Inc."]



Winsock2 Service Provider DLLs:

-------------------------------


Namespace Service Providers


HKLM\System\CurrentControlSet\Services\Winsock2\Parameters\NameSpace_Catalog5\Catalog_Entries\ {++}

000000000001\LibraryPath = "%SystemRoot%\System32\mswsock.dll" [MS]

000000000002\LibraryPath = "%SystemRoot%\System32\winrnr.dll" [MS]

000000000003\LibraryPath = "%SystemRoot%\System32\mswsock.dll" [MS]


Transport Service Providers


HKLM\System\CurrentControlSet\Services\Winsock2\Parameters\Protocol_Catalog9\Catalog_Entries\ {++}

0000000000##\PackedCatalogItem (contains) DLL [Company Name], (at) ## range:

%SystemRoot%\system32\mswsock.dll [MS], 01 - 03, 06 - 11

%SystemRoot%\system32\rsvpsp.dll [MS], 04 - 05



Toolbars, Explorer Bars, Extensions:

------------------------------------


Toolbars


HKCU\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser\

"{2318C2B1-4965-11D4-9B18-009027A5CD4F}"

  -> {HKLM...CLSID} = "&Google"

                   \InProcServer32\(Default) = "c:\program files\google\googletoolbar1.dll" ["Google Inc."]


HKLM\Software\Microsoft\Internet Explorer\Toolbar\

"{2318C2B1-4965-11D4-9B18-009027A5CD4F}" = (no title provided)

  -> {HKLM...CLSID} = "&Google"

                   \InProcServer32\(Default) = "c:\program files\google\googletoolbar1.dll" ["Google Inc."]


Extensions (Tools menu items, main toolbar menu buttons)


HKLM\Software\Microsoft\Internet Explorer\Extensions\

{E2E2DD38-D088-4134-82B7-F2BA38496583}\

"MenuText" = "@xpsp3res.dll,-20001"

"Exec" = "%windir%\Network Diagnostic\xpnetdiag.exe" [MS]


{FB5F1910-F110-11D2-BB9E-00C04F795683}\

"ButtonText" = "Messenger"

"MenuText" = "Windows Messenger"

"Exec" = "C:\Program Files\Messenger\msmsgs.exe" [MS]



Running Services (Display Name, Service Name, Path {Service DLL}):

------------------------------------------------------------------


avast! Antivirus, avast! Antivirus, ""C:\Program Files\Alwil Software\Avast4\ashServ.exe"" [null data]

avast! iAVS4 Control Service, aswUpdSv, ""C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe"" [null data]

avast! Mail Scanner, avast! Mail Scanner, ""C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service" ["ALWIL Software"]

avast! Web Scanner, avast! Web Scanner, ""C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service" ["ALWIL Software"]

NVIDIA Display Driver Service, NVSvc, "C:\WINDOWS\System32\nvsvc32.exe" ["NVIDIA Corporation"]

Sunbelt Kerio Personal Firewall 4, KPF4, ""C:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe"" ["Sunbelt Software"]

Webroot Spy Sweeper Engine, WebrootSpySweeperService, "C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe" ["Webroot Software, Inc."]



Keyboard Driver Filters:

------------------------


HKLM\System\CurrentControlSet\Control\Class\{4D36E96B-E325-11CE-BFC1-08002BE10318}\

"UpperFilters" = <> "SSKBFD" ["Webroot Software Inc (www.webroot.com)"]



Print Monitors:

---------------


HKLM\System\CurrentControlSet\Control\Print\Monitors\

CNY SELPHY CP LM1\Driver = "CNYMLM01.DLL" ["CANON INC."]



----------

<>: Suspicious data at a malware launch point.


+ This report excludes default entries except where indicated.

+ To see *everywhere* the script checks and *everything* it finds,

  launch it from a command prompt or a shortcut with the -all parameter.

+ To search all directories of local fixed drives for DESKTOP.INI

  DLL launch points, use the -supp parameter or answer "No" at the

  first message box and "Yes" at the second message box.

---------- (total run time: 87 seconds, including 9 seconds for message boxes)

Stawiam na falszywy alarm, ale prosze o analize, bo nigdy nie wiadomo cos sie w bitach czai.

[adam9870]

Logi są czyste.

Cytat @picasso:

$NtServicePackUninstall$ W trakcie instalacji Service Packa dostajesz pytanie czy archiwizować pliki instalacyjne na dysku. Jeśli dasz odpowiedź “nie” kopia zapasowa NIE jest tworzona. Jeśli dasz odpowiedź “tak” Windows automatycznie wygeneruje backup obecnych plików i ustawień właśnie w folderze: $NTServicepackUninstall$. Zawartość tego folderu jest wykorzystywana do przywrócenia stanu kompa sprzed instalacji SP. Jeśli skasujesz ten folder SP nie będzie się dało odinstalować z systemu. Nadal będzie wprawdzie figurować na liście Dodaj/Usuń ale próba deinstalacji zwróci błąd. Patrz dalej jak usunąć to wejście. Folder skasować można mając pewność iż SP nie będziesz odinstalowywać. Uwolnisz sporo miejsca na dysku…

źródło.

Tak więc być może kiedyś plik winlogon.exe był zainfekowany, a przy obecnym pliku znajdującym się w katalogu c:\windows\system32 a-squared Free nie ma nic do powiedzenia. Może instalacja SP2 lub innej poprawki systemowej spowodowała wyleczenie tego pliku.