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NTVDM.exe : Infected with malware and trojans


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#1 James2314

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Posted 18 September 2009 - 06:56 PM

Hello,
Norton alerted me that "n.exn" was "detected by SONAR" this morning, and since then I have done the following:

-I ran a full system scan using Norton, but according to the program, nothing was detected
-I ran a full scan using Spybot, and there were entries for Virtumonde.scn, and Win32.agent (or something, sorry I don't remember exactly). After removing these and having Spybot restart and scan automatically, similar entries were found and deleted.
-I ran a full scan using MBAM, and entries for Backdoor.Bot (4 entries), Stolen.data, Trojan.Agent, Trojan.Vundo, Trojan.Dropper (2 entries), and Hijack.shell were found. After removing these entries, I performed another full scan using MBAM, and nothing showed up.

Currently, the only symptom I notice is that there is a warning dialog box, usually when a program opens or I perform an operation, that says "The application or dll C:\\windows\system32\nodoveki.dll is not a valid Windows image. Please check this against your installation diskette."

This dialog box also pops up multiple times after restart, including two or three times before the blue welcome screen where I enter my password, and after I login, multiple times again and sometimes "dos" windows also appear.

I'm currently running Windows XP Home edition with SP3.

Would appreciate your help removing the malware/trojan! Thanks in advance.

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#2 boopme

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Posted 18 September 2009 - 07:15 PM

Hello and welcome.. Well this is most likely malware or a file corrupted by malware.
Please post you last MBAM log. I want to asvise you on these bots firsy then you can decide the next step.

One or more of the identified infections is a backdoor trojan.

This allows hackers to remotely control your computer, steal critical system information and download and execute files.

I would counsel you to disconnect this PC from the Internet immediately. If you do any banking or other financial transactions on the PC or if it should contain any other sensitive information, please get to a known clean computer and change all passwords where applicable, and it would be wise to contact those same financial institutions to apprise them of your situation.

Though the trojan has been identified and can be killed, because of it's backdoor functionality, your PC is very likely compromised and there is no way to be sure your computer can ever again be trusted. Many experts in the security community believe that once infected with this type of trojan, the best course of action would be a reformat and reinstall of the OS. Please read these for more information:

How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?
When Should I Format, How Should I Reinstall

We can still clean this machine but I can't guarantee that it will be 100% secure afterwards. Let me know what you decide to do.



To post MBAM.
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. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.


Next run ATF and SAS:
Note.. SAS doesn't open the registry hives for other user accounts on the system, so scans should be done from each user account.

Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

From your regular user account..
Download Attribune's ATF Cleaner and then SUPERAntiSpyware , Free Home Version. Save both to desktop ..
DO NOT run yet.
Open SUPER from icon and install and Update it
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 yet.

Now reboot into Safe Mode: How to enter safe mode(XP)
Using the F8 Method
Restart your computer.
When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
Select the option for Safe Mode using the arrow keys.
Then press enter on your keyboard to boot into Safe Mode
.

Double-click ATF-Cleaner.exe to run the program.
Under Main "Select Files to Delete" choose: Select All.
Click the Empty Selected button.

If you use Firefox or Opera browser click that browser at the top and choose: Select All
Click the Empty Selected button.
If you would like to keep your saved passwords, please click No at the prompt.
Click Exit on the Main menu to close the program
.

NOW Scan with SUPER
Open from the desktop icon or the program Files list
On the left, make sure you check C:\Fixed Drive.
Perform a Complete scan. After scan,Verify they are all checked.
Click OK on the summary screen to quarantine all found items.
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.


Please ask any needed questions,post logs and Let us know how the PC is running now.
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#3 James2314

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Posted 19 September 2009 - 08:18 AM

Hi, thank you for the reply.
I followed the instructions and this is what happened:
-I updated MBAM, and performed a full system scan, and the log is posted below.
-I downloaded ATF and SAS, and followed the instructions; however, when I tried to boot up in Safe Mode, I got a blue screen saying "A problem has been detected and Windows has been shut down to prevent damage to your computer. If this is the first time you've seen this Stop error screen, restart your computer. If this screen appears again, follow these steps: Check for viruses on your computer. Remove any newly installed hard drives or hard drive controllers. Etc..."
-I tried to restart and reboot in Safe Mode, but I got the same error.

Rebooting normally is fine, except I still get the "nodoveki.dll" error messages during reboot and whenever I open an application.

Do you think it is better to reformat the computer, or continue trying other methods of getting rid of the virus/trojan? What steps should I follow next?

Thanks again for the help.

#4 boopme

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Posted 19 September 2009 - 07:45 PM

Your decision as to what action to take should be made by reading and asking yourself the questions presented in the "When should I re-format?" and What Do I Do? links I previously provided. As I already said, in some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. Wiping your drive, reformatting, and performing a clean install of the OS or doing a factory restore removes everything and is the safest action but I cannot make that decision for you.

Reformatting a hard disk deletes all data. If you decide to reformat, you can back up all your important documents, data files and photos. The safest practice is not to backup any autorun.ini or .exe files because they may be infected. Some types of malware may disguise itself by adding and hiding its extension to the existing extension of files so be sure you take a close look at the full name. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard drive.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#5 BITSFL

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Posted 07 October 2009 - 09:51 AM

I had a client this morning with this exact issue. Sonar had detected the n.exn and deleted it completely. After rebooting they noticed the dll image errors when starting programs. search in the registry for the dll that pops up. it should be found around the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ in a key called app_init. Sorry if that is not exact, but I am not at that pc anymore. Anyways, remove the dll files in question from that key. this pc had 2 dlls.

I assume what is happening is Norton is removing the infected files but not fixing the registry entry that calls these files on every exe load.

hope this helps.




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