The main task of a Trojan carrying a backdoor is to shut down the anti-virus software running on the computer. It installs itself mutely on the computer, making sure that it’s unnoticed. The most common installation methods involve system or security mistreatment, and unsuspicious users manually executing unknown programs. This backdoor can be distributed through email attachments, peer-to-peer connection, instant messaging etc.
Now a lot of people know how one can get infected through a backdoor or the symptoms of getting one. The main issue is how to protect your computer against backdoor or to get rid of one. First thing to do is to have an anti-virus software and a anti-malware software running at all times. The user who uses internet frequently should keep those software updated at all times to avoid getting infected from old as well as new Trojans, viruses etc.
Although protecting your computer against backdoor is hard as almost none of the websites are clean to browse on except for few. So eight simple steps of removing a backdoor from your computer that might help you are:
Step 1: Click Start > Run and type Regedit.
Step 2: Select My Computer and press Ctrl + F and search for:
Step 3: In the right window, look for a registry key with a value that loads the "icqnuke.exe" file. This is the registry key that provides the ability to load the server portion of the Trojan whenever the computer is started.
Step 4: In the right window select this particular key and delete it.
Step 5: Exit the Registry.
Step 6: Click Start > Shutdown > "Restart in MS-DOS mode".
Step 7: After the computer has restarted, change to the WINDOWS or WINDOWSSYSTEM directory and delete the "icqnuke.exe" file.
Step 8: Restart your computer again.
Congratulations, you have successfully removed a backdoor from your computer.
Other ways of protection against backdoor is online scanners that scan your entire hard drive for any possible files that might be working as a backdoor and delete them off. Symantec.com is a very helpful website for virus, Trojan removal. The following website will help you a lot to remove backdoor manually: http://www.spywareremove.com/remove-Backdoors/index.html