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Malware Defense. How to remove? (Uninstall guide)

removal by Jake Doevan - -   Also known as MalwareDefense | Type: Rogue Antispyware

Malware Defense is a fake antivirus program from the same family as AntiMalware virus. Please read the removal instructions carefully and remove this infection from your computer as soon as possible. MalwareDefense is promoted through the use of Trojans, mostly Trojan.FakeAlert. Most of the time, Trojans come from fake online scanners, misleading websites or masquerading as a fake video codec. Please note that Trojans can come bundled with other illegitimate software. Once installed, Malware Defense will generate fake alerts or notifications and report false detections in order to convince you to purchase this bogus anti-virus software. Please don’t purchase it. Otherwise, you will simply lose your money.

Malware Defense graphical user interface
[Figure 1. Malware Defense graphical user interface]

When running, Malware Defense will simulate a system scan and display a list of infections that can’t be removed with a trial version of this program. In order to remove found infections you have to buy a full version of it. However, this is nothing more but a scam. Let’s see why. First of all, MalwareDefense reports non-existing or legitimate Windows files as infections. Do not remove those files manually because you can seriously damage your computer. Some of the infections will be shown with the following names: Backdoor.Win32.Agent.ich, Rootkit.Win32.Agent.pp, Trojan.Dropper, Virus.Win32.Gpcode.ak, Email-Worm.Win32.NetSky.q, Net-Worm.Win32.Mytob.t and etc. Usually, Malware Defense detects those infections in main Windows OS directories. Of course, this malicious software detects the same infections on every infected computer.

While running, Malware Defense will also display fake security alerts, notifications and error messages. This is a part of MalwareDefense scam. This virus will block particular software and display fake warning that states:

There is unauthorized antivirus software detected on your computer. It is recommend you to remove it, otherwise it could conflict with Malware Defense. Press ‘OK’ to terminate [Program name]

Other fake security alerts will state that your computer is not protected and that Internet Explorer, Windows Messenger or other programs are infected. While browsing the web you will likely see fake warnings claiming that particular websites are dangerous and may harm your PC.

Malware Defense is not legitimate security software. It’s a well-thought-out scam. If you fins that your computer is already infected, please use the manual removal guide stated below or download an automatic removal tool to remove Malware Defense from the system as soon as possible. Remember, do not purchase it. If you have already purchased this misleading program, contact your credit card company and dispute the charges.

We might be affiliated with any product we recommend on the site. Full disclosure in our Agreement of Use. By Downloading any provided Anti-spyware software to remove Malware Defense you agree to our privacy policy and agreement of use.
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Compatible with Microsoft Windows Compatible with OS X
What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Malware Defense. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

Note: Manual assistance required means that one or all of removers were unable to remove parasite without some manual intervention, please read manual removal instructions below.

More information about this program can be found in Reimage review.
Press mentions on Reimage

Malware Defense manual removal:

Kill processes:


Delete registry values:




HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun "Malware Defense"

Unregister DLLs:

Delete files:





Malware Defense Support.lnk

Malware Defense.lnk

Uninstall Malware Defense.lnk

Delete directories:
C:Program FilesMalware Defense

%UserProfile%Start MenuProgramsMalware Defense

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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  • Martha

    In the complicated world we live in, its good to find simple sloiutnos.

  • Guest

    Just want to say thanks.
    One point for anyone out there…If your system keeps telling you that the mdext.dll is “in use or read/write protected” just change the name of the file. that seems to break the code/macro text running in the background…

  • Guest

    I tried what you said and seemed to work, but I was still getting the “out of nowhere” audio advertisements and the bug would prevent me from reaching this site or other sites that help you remove the virus.

  • Guest

    I finally deleted my windows folder and reinstalled windows and that got rid of it. Im not sure how i got it, if it was downloading a file or playing something on the web, any way thanks for you help

  • Guest

    I rebooted then the computer got stuck on the “Welcome” screen at the beginning. I would click to log in and instead it would make the sound of logging out. By far the smartest and toughest bug Ive seen.

  • Guest

    yea system restore was disabled for me too

  • Guest

    system restore is disabled and mdext.dll is nowhere to be found

    stuck at this point.

  • Guest

    2010-01-15 21:01:29, hey, I tried what you said and it works! thanks alot dude

  • Guest

    Does any one know how to locate mdext.dll????

  • Guest

    System restore also deletes it. Just turn off your computer, then when you restart it press F8 repeatedly. Then Repair Computer. Then choose System Restore. You can restore it to an earlier date. Then when you log onto your account Malaware Defense is gone!

  • Guest

    I was not able to locate the mdext.dll either, I did some searches for it in Explorer, but was not successful. I also cannot locate the big long file name in the delete files section.

  • Guest

    I cant exactly figure out what to do with the .DLL and the guide for getting rid of malicious .DLLs isn't very helpful

  • Guest

    I hav done what the guide said, but when I try to delete .dll I get “Access denied”. Any solution to that?

  • Guest

    what can you do to fix this problem if you have already manually removed some of these files?

  • Guest

    Didn't work. try manually getting rid of it

  • Guest

    I wonder if it's some sick joke, but I went to Start>Programs>Malware Defense>Uninstall, and it seems to work…for now (about 10 minutes).
    If something happens, I'll let you know….

  • Guest

    I tried to follow the manual removal guide, and succeded with every thing exept to get rid of the mdext.dll because I couldnĀ“t find the exact location. Anyone that can guid an amateur more specific then the guide above? Most functions of the comp. are still blocked.

  • Guest

    Malwarebytes Installation freezes up when its almost done and everything not responds before its done.

  • Guest

    Re 1 – Malware Defense disables System Restore so this is a non-starter. (It also disables conventional AV programs and prevents you from installing new ones. The manual removal guide is the only working solution I've found.

  • Guest

    Another easy method that works for me is to roll back to a previous restore point to before the alerts started. Provided you havn't loaded any new software or updated, cuz you will have to reload those…

  • Guest

    I had similar problems the automatic removal would start and then stop part way through. When I followed the step by step instructions not all the files were there to delete and when I was done the program just came back again.

  • Guest

    i completed the steps required but my comp seems to totally freeze within 5 mins.
    in safe mode working for hours without a prob.
    could this be related ?
    or another issue ?
    help greatly apreciated

  • Guest

    automatic removal won't start, help????????????