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Missing C:\Windows\system32\logon.exe?/MOVED


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#1 Obfuscated

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Posted 24 May 2009 - 02:50 PM

Hello BleepingComputer,

I recently ran my MBAM (malwarebytes) for an antimalware scan, and it had detected C:\WINDOWS\system32\logon.exe as a Trojan.Agent,and before thinking it through, I decided to go along with its decision and "delete on reboot." Now everytime I login, a windows error message comes up that says "missing logon.exe, check your system if its spelled right, etc etc" and it seems everytime I open up Windows Explorer, it crashes... :thumbsup: Is there any way I can get a "replacement logon.exe," or what else can I do?
Thanks in advance for your help!
~Obfuscated

Edited by garmanma, 24 May 2009 - 04:48 PM.


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#2 hamluis

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Posted 24 May 2009 - 04:26 PM

Logon.exe is malware...winlogon.exe is a valid Windows file.

http://www.baidumsg.com/Howtoremove/Howtoremove_40281.html

http://www.prevx.com/filenames/X1615289856.../LOGON.EXE.html

http://www.neuber.com/taskmanager/process/winlogon.exe.html

I am going to suggest that your post be moved to the Am I Infected forum, where those more knowledgeable can assist you.

Louis

#3 garmanma

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Posted 24 May 2009 - 08:02 PM

As Louis stated, logon.exe is malware
http://www.bleepingcomputer.com/startups/
Try running SAS



SAS,may take a long time to scan
Please download and scan with SUPERAntiSpyware Free
  • Double-click SUPERAntiSypware.exe and use the default settings for installation.
  • An icon will be created on your desktop. Double-click that icon to launch the program.
  • If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download them from here. Double-click on the hyperlink for Download Installer and save SASDEFINITIONS.EXE to your desktop. Then double-click on SASDEFINITIONS.EXE to install the definitions.)
  • In the Main Menu, click the Preferences... button.
  • Click the "General and Startup" tab, and under Start-up Options, make sure "Start SUPERAntiSpyware when Windows starts" box is unchecked.
  • Click the "Scanning Control" tab, and under Scanner Options, make sure the following are checked (leave all others unchecked):
    • Close browsers before scanning.
    • Scan for tracking cookies.
    • Terminate memory threats before quarantining.
  • Click the "Close" button to leave the control center screen and exit the program.
  • Do not run a scan just yet.
Reboot your computer in "Safe Mode" using the F8 method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".

Scan with SUPERAntiSpyware as follows:
  • Launch the program and back on the main screen, under "Scan for Harmful Software" click Scan your computer.
  • On the left, make sure you check C:\Fixed Drive.
  • On the right, under "Complete Scan", choose Perform Complete Scan and click "Next".
  • After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click "OK".
  • Make sure everything has a checkmark next to it and click "Next".
  • A notification will appear that "Quarantine and Removal is Complete". Click "OK" and then click the "Finish" button to return to the main menu.
  • If asked if you want to reboot, click "Yes" and reboot normally.
  • To retrieve the removal information after reboot, launch SUPERAntispyware again.
    • Click Preferences, then click the Statistics/Logs tab.
    • Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
    • If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
    • Please copy and paste the Scan Log results in your next reply.
  • Click Close to exit the program.

Mark
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#4 Obfuscated

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Posted 24 May 2009 - 10:18 PM

Hello Garmanma,

thanks for your assistance! Just a quick question though, I already deleted C:\WINDOWS\system32\logon.exe, so is this SAS scan to check if there's any malware left?

also, what should I do about the error message that keeps popping up every time I log in, that says "logon.exe missing"? (Edit: and does the windows explorer crashing have anything to do with this?)

Thanks again,
~Obfuscated

Edited by Obfuscated, 24 May 2009 - 10:22 PM.


#5 garmanma

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Posted 25 May 2009 - 05:59 PM

Its not unusual to receive such an error after using specialized fix tools.

A "Cannot find...", "Could not run...", "Error loading... or "specific module could not be found" message is usually related to malware that was set to run at startup but has been deleted. Windows is trying to load this file but cannot locate it since the file was mostly likely removed during an anti-virus or anti-malware scan. However, an associated orphaned registry entry remains and is telling Windows to load the file when you boot up. Since the file no longer exists, Windows will display an error message. You need to remove this registry entry so Windows stops searching for the file when it loads.

To resolve this, download Autoruns, search for logon.exe entry and then delete it.

Create a new folder on your hard drive called AutoRuns (C:\AutoRuns) and extract (unzip) the file there. (click here if you're not sure how to do this.)
Open the folder and double-click on autoruns.exe to launch it.
Please be patient as it scans and populates the entries.
When done scanning, it will say Ready at the bottom.
Scroll through the list and look for a startup entry related to the file(s) in the error message.
Right-click on the entry and choose delete.
Reboot your computer and see if the startup error returns.



I already deleted C:\WINDOWS\system32\logon.exe, so is this SAS scan to check if there's any malware left?


Yes
Mark
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why won't my laptop work?

Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around
Do not send me PMs with problems that should be posted in the forums. Keep it in the forums, so everyone benefits
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#6 Obfuscated

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Posted 26 May 2009 - 11:51 PM

Heello!

I was not able to boot up my PC in safe mode for some reason [the screen filled with a list of drivers, then restarted normally], but I still completed a scan with SAS anyways.

Also, I was successfully able to stop the error message with your Autoruns program! :D

Here is the Log, though.

~ Obfuscated

SUPERAntiSpyware Scan Log
http://www.superantispyware.com

Generated 05/26/2009 at 09:21 PM

Application Version : 4.26.1004

Core Rules Database Version : 3911
Trace Rules Database Version: 1855

Scan type : Complete Scan
Total Scan Time : 03:25:18

Memory items scanned : 534
Memory threats detected : 0
Registry items scanned : 6095
Registry threats detected : 0
File items scanned : 68430
File threats detected : 7

Adware.Tracking Cookie
C:\Documents and Settings\Claire\Cookies\claire@cgi[2].txt
C:\Documents and Settings\Claire\Cookies\claire@www.shopica[1].txt
.discounttire.com [ C:\Documents and Settings\LocalService\Application Data\Mozilla\Firefox\Profiles\iz25m3ni.default\cookies.txt ]
.discounttire.com [ C:\Documents and Settings\LocalService\Application Data\Mozilla\Firefox\Profiles\iz25m3ni.default\cookies.txt ]
.discounttire.com [ C:\Documents and Settings\LocalService\Application Data\Mozilla\Firefox\Profiles\iz25m3ni.default\cookies.txt ]
www.discounttire.com [ C:\Documents and Settings\LocalService\Application Data\Mozilla\Firefox\Profiles\iz25m3ni.default\cookies.txt ]
www.discounttire.com [ C:\Documents and Settings\LocalService\Application Data\Mozilla\Firefox\Profiles\iz25m3ni.default\cookies.txt ]

#7 garmanma

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Posted 04 June 2009 - 07:28 AM

I'm sorry I overlooked your post. Not sure how I missed it
I think we're in the home stretch
---------------------------


Please download Dr.Web CureIt, the free version & save it to your desktop. DO NOT perform a scan yet.

Reboot your computer in "Safe Mode" using the F8 method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".

Scan with Dr.Web CureIt as follows:
  • Double-click on launch.exe to open the program and click Start. (There is no need to update if you just downloaded the most current version
  • Read the Virus check by DrWeb scanner prompt and click Ok where asked to Start scan now? Allow the setup.exe to load if asked by any of your security programs.
  • The Express scan will automatically begin.
    (This is a short scan of files currently running in memory, boot sectors, and targeted folders).
  • If prompted to dowload the Full version Free Trial, ignore and click the X to close the window.
  • If an infected object is found, you will be prompted to move anything that cannot be cured. Click Yes to All.
  • When complete, click Select All, then choose Cure > Move incurable.
    (This will move any detected files to the C:\Documents and Settings\userprofile\DoctorWeb\Quarantine folder if they can't be cured)
  • Now put a check next to Complete scan to scan all local disks and removable media.
  • In the top menu, click Settings > Change settings, and UNcheck "Heuristic analysis" under the "Scanning" tab, then click Ok.
  • Back at the main window, click the green arrow "Start Scanning" button on the right under the Dr.Web logo.
  • When the scan is complete, a message will be displayed at the bottom indicating if any viruses were found.
  • Click "Yes to all" if asked to cure or move the file(s) and select "Move incurable".
  • In the top menu, click file and choose save report list.
  • Save the DrWeb.csv report to your desktop.
  • Exit Dr.Web Cureit when done.
  • Important! Reboot your computer because it could be possible that files in use will be moved/deleted during reboot.
  • After reboot, post the contents of the log from Dr.Web in your next reply. (You can use Notepad to open the DrWeb.cvs report)

Mark
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why won't my laptop work?

Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around
Do not send me PMs with problems that should be posted in the forums. Keep it in the forums, so everyone benefits
Become a BleepingComputer fan: Facebook and Twitter

#8 Obfuscated

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Posted 20 June 2009 - 12:49 AM

Hi again, garmanma!

Sorry, this time I was unavailable for quite a while as well :thumbsup:

But anyways, here's the current status with me:
~windows explorer keeps crashing is fixed
~browser still continuously redirects my searches
~some popups keep coming through for some reason?

should I still continue with your previous request [ with the Dr. Web Cure-It?]

~Obfuscated

#9 Orange Blossom

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Posted 22 June 2009 - 12:15 AM

Hello,

Now that you have posted a log here: http://www.bleepingcomputer.com/forums/t/235761/search-engine-keeps-redirecting/ you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a HJT Team member, nor should you ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the HJT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the HJT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond. Please be patient. It may take a while to get a response but your log will be reviewed and answered as soon as possible

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :thumbsup:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

Orange Blossom

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