How to remove Bifrost NWCWorkstatione.dll

Bifrost NWCWorkstatione.dll

Last Updated on Tuesday, 05 January 2010 07:19 Tuesday, 05 January 2010 07:03

The file name NWCWorkstatione.dll has appeared in an virus analysis report. You can see it on this link

It is a component of backdoor Trojan Bifrose or BiFrost. It connects to remote hosts. It can download harmful files from the internet. A good firewall can detect harmful activities and prevent them. Some good freeware are ZoneAlarm Free Firewall, and Comodo Internet Security Free Edition (you can choose to install just the firewall from their security suite)

It creates a fake windows service named MS Device Notices/NWCWorkstation.

It infects Internet explorer browser. It attaches a keylogger with Internet Explorer. That will steal your user ID and passwords. So do not use Internet explorer until the virus is removed.

It creates the files NWCWorkstatione.dll on the infected computer that you need to search and delete. You should also remove the file's entries from windows startup.

There are several variations in the EXE file names used by this virus. I have grouped them together in BiFrost Family

Statutory Warning: It is possible that some legitimate application may be using the same name as that of the virus. Use Windows Defender or SysInternal Process Explorer to differentiate between them.

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

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

Remove Processes from Task Manager

You can find out if a process in Task Manager is good or bad by using Windows Defender. It shows the path of a process and its publisher. Harmful processes may be shown under Unknown Publisher in windows defender.

How to use Windows Defender in windows XP

How to use Windows Defender in windows Vista

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 "NWCWorkstatione.dll" (also look for any other suspicious names) Press Apply , Press Close/Ok , Select "do not restart" at the next prompt.

Stopping the Fake windows service

Click on the Services tab in system configuration utility. Check the box that says "Hide all Microsoft services", now locate a service named MS Device Notices/NWCWorkstation. See if it is checked. If it is checked, then uncheck it to stop it. Now press Apply , Press Close/Ok , Select "restart" at the next prompt in order to restart the computer.

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 NWCWorkstatione.dll and find out if there are any other instances of this file present elsewhere in the computer.

Files

C:\Windows\System32\NWCWorkstatione.dll
Registry KeysSome of the registry keys will be automatically removed if you run Registry menu of CCleaner. You can see the registry keys on the link given at the beginning of the 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.