How to remove nvdisp.exe, 52

nvdisp.exe, 52_MSUpdate.exe

Last Updated on Friday, 03 December 2010 12:21 Friday, 03 December 2010 08:19

The file names nvdisp.exe, 52_MSUpdate.exe, have appeared in a virus analysis report. You can see it on this link

The installer is of about 171 KB. It is identified as ZBot Trojan.
You can read more about this virus on Symantec website
If you are a security professional, this article on ThreatExpert blog can give you more insight into the ZBot/ Zeus
It is a banking trojan that disables firewall, steals sensitive financial data (credit card numbers, online banking login details), makes screen snapshots, downloads additional components, and provides a hacker with the remote access to the infected computer.
It keeps itself hidden by making its files and folders as Hidden files/folders.
It creates a new memory page in the address space of cmd.exe and iexplore.exe. You should see if there is cmd.exe and iexplore.exe running in the task manager, and then terminate their processes. Avoid using cmd.exe and Internet Explorer till the computer is infected. Use another browser if you need to.
It connects to other harmful sites and download more harmful files.

It creates the files nvdisp.exe, 52_MSUpdate.exe, sdra64.exe, windows_7full.scr, System.Data.SQLite.DLL on the infected computer that you need to search and delete. You should end running processes named nvdisp.exe, 52_MSUpdate.exe, sdra64.exe, windows_7full.scr, System.Data.SQLite.DLL from Task Manager. And also remove the file's entries from windows startup.

Warning: It is possible that some legitimate software may be using the same file names as that of the virus files. You do not have to delete these files if they belong to some legitimate program installed on your computer. Use Windows Defender or SysInternals Process Explorer to differentiate between them. The information in this article is presented without making any claims regarding its usefulness or otherwise. In case of disagreement/ dispute, please send a note by adding a comment at the end of this page, or mail on support(at)comprolive.com

Using System Restore

If you know the duration since your computer is infected, you can try to restore your computer at a prior date, that will be an easy way to undo the changes done by the virus

Using system restore in windows XP
Using system restore in windows Vista
Using system restore in windows7

Boot in safe mode

Sometimes you can not delete a file. You should boot in safe mode and then try to delete it.

How to boot in safe in windows XP
How to boot in safe mode in windows Vista
How to boot in safe mode in windows7

View Hidden Files

You need to enable to view hidden files and folders before searching.
How to Enable to View Hidden Files and Folders in Windows XP
How to Enable to View Hidden Files and Folders in Windows Vista
How to Enable to View Hidden Files and Folders in Windows7

Remove Processes from Task Manager

Press Ctrl Alt Del keys to open the Task Manager.Select Processes tab. You will see a list. Look for the names nvdisp.exe, 52_MSUpdate.exe, sdra64.exe, windows_7full.scr, System.Data.SQLite.DLL in it. Select if found and press the End Process button. It will ask for your confirmation to end that process. Select Yes. You can end one process at a time. You can find out if a process in Task Manager is good or bad by using Windows Defender in XP and Vista. It shows the path of a process and its publisher. Harmful processes may be shown under Unknown Publisher in windows defender. Whereas in Windows7 you can find that out from the task manager itself

How to use Windows Defender in windows XP
How to use Windows Defender in windows Vista
How to use Windows Defender in windows7

Or you can use Sysinternal's Process Explorer. How to use Sysinternal's Process Explorer

Removing entry from windows startup

The system configuration can be started in xp and in vista by typing msconfig in the run box/ start menu search box.
In xp by clicking on Start > run . The windows startup is reversible. You can check / uncheck any entry from windows startup any number of times.

Open system configuration window.Click on the Startup tab. You will see a list all the programs that are scheduled to start with windows. Expand the middle column using your mouse pointer. That will show you the full path of the program. Locate and uncheck the boxes in front of these names "nvdisp.exe, 52_MSUpdate.exe, sdra64.exe, windows_7full.scr, System.Data.SQLite.DLL" (also look for any other suspicious names)Press Apply , Press Close/Ok , Select "restart" at the next prompt.

Deleting files

The computer will restart now. Delete the following files and folders. Boot in safe mode or boot in the dos prompt if needed. You can use windows search utility to search for nvdisp.exe, 52_MSUpdate.exe, sdra64.exe, windows_7full.scr, System.Data.SQLite.DLL

Files
C:\Documents and Settings\[UserName]\Templates\52_MSUpdate.exe
C:\Documents and Settings\[UserName]\Templates\nvdisp.exe
C:\Documents and Settings\[UserName]\Templates\System.Data.SQLite.DLL
C:\Windows\System32\windows_7full.scr
C:\Windows\System32\workgroup
C:\Windows\System32\sdra64.exe
%Temp%\TMP.dat
[file and pathname of the sample #1]

(We do not know the name or the location of sample #1, it could be in your default download location or on the desktop or in a Temp folder. The files and folders in the Temp folder can be automatically removed, if you use a freeware temp files/ registry cleaner software like CCleaner)
Folders
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More Files
Apart from the files and folders above this Family of virus is found to create following files as detected in this report
Files. I am listing them separately because they are not part of the first report. But you should check for these files because they are more harmful than the earlier files.
C:\Windows\System32\sdra64.exe
C:\Windows\System32\lowsec\local.ds
C:\Windows\System32\lowsec\user.ds
C:\Windows\Temp\Temporary Internet Files\Content.IE5\6PZ0AKC4\desktop.ini
C:\Windows\Temp\Temporary Internet Files\Content.IE5\CZOPQDS7\desktop.ini
C:\Windows\Temp\Temporary Internet Files\Content.IE5\desktop.ini
C:\Windows\Temp\Temporary Internet Files\Content.IE5\O96JWNKF\desktop.ini
C:\Windows\Temp\Temporary Internet Files\Content.IE5\OK18ISXV\desktop.ini
C:\Windows\Temp\Temporary Internet Files\Content.IE5\index.dat

Folders
C:\Windows\System32\lowsec
C:\Windows\Temp\Cookies
C:\Windows\Temp\History
C:\Windows\Temp\History\History.IE5
C:\Windows\Temp\Temporary Internet Files
C:\Windows\Temp\Temporary Internet Files\Content.IE5
C:\Windows\Temp\Temporary Internet Files\Content.IE5\6PZ0AKC4
C:\Windows\Temp\Temporary Internet Files\Content.IE5\CZOPQDS7
C:\Windows\Temp\Temporary Internet Files\Content.IE5\O96JWNKF
C:\Windows\Temp\Temporary Internet Files\Content.IE5\OK18ISXV

Registry Keys

Some of the registry keys will be automatically removed if you run Registry menu of CCleaner. For others you can see the report mentioned at the beginning of this article .

Using CCleaner

You can easily remove the files in the temp folder by running CCleaner. You can set CCleaner to run automatically each time the computer starts. Do not forget to run CCleaner > Registry menu to remove the obsolete registry entries.