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How do I remove core.cache.dsk and nmntt.sys?


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7 replies to this topic

#1 ryan1225

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Posted 04 January 2009 - 06:45 PM

About a week ago I discovered Antivirus2009 on my laptop - I had so many pop-ups I could barely use internet explorer or mozilla.

Using multiple virus scanners, I was able to remove many of the trojans and infected files. More recently, Malwarebytes found nmntt.sys in my system32/drivers folder as well as in my registry in a few spots. Malwarebytes also found core.cache.dsk in my system32/drivers folder. Malwarebytes cannot remove or delete these files - Nor can I manually delete them.

Can anyone help me with removing these files? I appreciate any help anyone can offer! Thanks

Edited by Orange Blossom, 04 January 2009 - 07:09 PM.
Move from HiJack This forum to Am I Infected as there are no logs. ~ OB


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#2 rigel

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Posted 04 January 2009 - 07:16 PM

Lets start with a Malwarebytes log. Please update and rerun malwarebytes.

The process of cleaning your computer may require temporarily disabliling some security programs. If you are using SpyBot Search and Destroy, please refer to Note 2 at the bottom of this page.

On the Scanner tab:
  • Make sure the "Perform Quick Scan" option is selected.
  • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen:
  • Click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply and exit MBAM.
Note:
-- If MBAM encounters a file that is difficult to remove, you may be asked to reboot your computer so it can proceed with the disinfection process. Regardless if prompted to restart the computer or not, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.

Note 2:
-- MBAM may make changes to your registry as part of its disinfection routine. If you're using other security programs that detect registry changes (like Spybot's Teatimer), they may interfere with the fix or alert you after scanning with MBAM. Please disable such programs until disinfection is complete or permit them to allow the changes. To disable these programs, please view this topic: How To Temporarily Disable Your Anti-virus, Firewall And Anti-malware Programs

"In a world where you can be anything, be yourself." ~ unknown

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#3 ryan1225

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Posted 04 January 2009 - 08:36 PM

Thanks for your reply : Here is the log file. The MS Juan and Vundo seem to show up everytime also.



Malwarebytes' Anti-Malware 1.31
Database version: 1456
Windows 5.1.2600 Service Pack 2

1/4/2009 8:25:06 PM
mbam-log-2009-01-04 (20-25-06).txt

Scan type: Quick Scan
Objects scanned: 57470
Time elapsed: 6 minute(s), 37 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 4
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\nmntt (Rootkit.Agent) -> Delete on reboot.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\nmntt (Rootkit.Agent) -> Delete on reboot.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MS Juan (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MS Track System (Trojan.Vundo) -> Quarantined and deleted successfully.

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\WINDOWS\system32\drivers\nmntt.sys (Rootkit.Agent.H) -> Delete on reboot.
C:\WINDOWS\system32\drivers\core.cache.dsk (Rootkit.Agent) -> Delete on reboot.

#4 rigel

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Posted 05 January 2009 - 12:59 PM

Please print out and follow these instructions: "How to use SDFix". <- This program is for Windows 2000/XP ONLY.
When using this tool, you must use the Administrator's account or an account with "Administrative rights"
  • Disconnect from the Internet and temporarily disable your anti-virus, script blocking and any real time protection programs before performing a scan.
  • When done, the SDFix report log will open in notepad and automatically be saved in the SDFix folder as Report.txt.
  • If SDFix is unable to run after rebooting from Safe Mode, run SDFix in either Mode, and type F, then press Enter for it to finish the final stage and produce the report.
  • Please copy and paste the contents of Report.txt in your next reply.
  • Be sure to renable you anti-virus and and other security programs before connecting to the Internet.
-- If the computer has been infected with the VirusAlert! malware warning from the clock and the Start Menu icons or drives are not visible, open the SDFix folder, right-click on either the XP_VirusAlert_Repair.inf or W2K VirusAlert_Repair.inf (depending on your version of Windows) and select Install from the Context menu. Then reboot to apply the changes.

"In a world where you can be anything, be yourself." ~ unknown

"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith


#5 ryan1225

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Posted 06 January 2009 - 06:53 PM

Thank you very much for your help. After I disabled all of my other anti-virus programs and ran Malwarebytes, those files were deleted upon startup. I ran Malwarebytes and Spybot once again and retrieved a clean report. I no longer have annoying pop ups either.

I do have a question, will my PC be safe if I am running Spybot and BOClean? I also have Comodo antivirus running, but I was thinking about uninstalling it. Also, my PC is a work laptop and they have Trend Microscan running on it. How many scanners and utilities is too much?


Thanks again for your help.

#6 rigel

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Posted 06 January 2009 - 07:15 PM

The infection you have usually doesn't go away that easy...

If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok"
  • Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" Tab.
  • Click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
You need only one anti-virus package loaded. I must yield to your work IT staff to say what is loaded though. Many people use SpyBot and its Teatimmer package as protection, and are very pleased. I don't know anything about BOClean, so I won't comment.

I would recommend keeping your antivirus current and uptodate.
Scanning at least once a week with Malwarebytes. It is a very good at what it does.
Practice safe surfing
Find a firewall. There are many out there that are free. Here is a link

If you have any other questions - just ask :thumbsup:

"In a world where you can be anything, be yourself." ~ unknown

"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith


#7 ryan1225

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Posted 09 January 2009 - 11:21 PM

Before creating an account on this forum I did have to delete a whole list of files manually that for whatever reason did not show up on the scan. It has been almost a week now and still no popups. I will finish by following the system restore recommendations - Thanks


By the way, where could I have gotten such a nasty virus? I don't visit any inappropriate websites of any kind, anywhere in particular I could have picked it up?


Thank you very much for your help!

#8 rigel

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Posted 09 January 2009 - 11:48 PM

It could have come in many different ways. you may have been a victim of a drive by per se. Some site become infected without the owners knowing it. Most of the time, it is Porn, some poker, P2P, and warez sites. Even Facebook has taken a beating as of late. Take a look here and see what notices are given out. Those are targets for malware writers.

Take care Ryan!

"In a world where you can be anything, be yourself." ~ unknown

"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith





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