Remove Malware Defense. Description and removal instructions

 
Title: Malware Defense
Also known as: MalwareDefense
Type: Spyware
Severity scale:Malware Defense severity is 73  (73 / 100)
 
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.


Related files: Uninstall Malware Defense.lnk, Malware Defense.lnk, Malware Defense Support.lnk, md.db, help.ico, Uninstall.exe, mdext.dll, mdefense.exe

Malware Defense properties:
• Changes browser settings
• Shows commercial adverts
• Connects itself to the internet
• Stays resident in background

Automatic Malware Defense removal:

remover for Malware Defense

Malware Defense manual removal:

Kill processes:
mdefense.exe uninstall.exe
Delete registry values:
HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\SimpleShlExt
HKEY_CLASSES_ROOT\CLSID\{5E2121EE-0300-11D4-8D3B-444553540000}
HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\SimpleShlExt
HKEY_LOCAL_MACHINE\SOFTWARE\Malware Defense
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "Malware Defense"
Unregister DLLs:
mdext.dll

Delete files:
mdefense.exe mdext.dll uninstall.exe help.ico md.db Malware Defense Support.lnk Malware Defense.lnk Uninstall Malware Defense.lnk
Delete directories:
C:\Program Files\Malware Defense
%UserProfile%\Start Menu\Programs\Malware Defense

Other programs to remove Malware Defense:

• Malwarebytes Anti Malware - Review - Download
• Malwarebytes Anti Malware - Review - Download
• Windows Defender - Review - Download

Information added: 21/12/09
Information updated: 06/02/10

Additional resources related to Malware Defense:

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Comments from visitors:


1. by . 2010-02-06 09:02:23
Hey,
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...
Peace,
G

2. by . 2010-01-18 08:01:44
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

3. by . 2010-01-18 08:01:39
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.

4. by . 2010-01-18 08:01:48
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.

5. by . 2010-01-18 08:01:32
yea system restore was disabled for me too

6. by . 2010-01-17 15:01:21
system restore is disabled and mdext.dll is nowhere to be found

stuck at this point.

7. by . 2010-01-16 14:01:31
2010-01-15 21:01:29, hey, I tried what you said and it works! thanks alot dude

8. by . 2010-01-16 08:01:41
Does any one know how to locate mdext.dll????

9. by . 2010-01-15 21:01:29
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!

10. by . 2010-01-15 02:01:41
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.

11. by . 2010-01-13 14:01:56
I cant exactly figure out what to do with the .DLL and the guide for getting rid of malicious .DLLs isn't very helpful

12. by . 2010-01-12 05:01:18
I hav done what the guide said, but when I try to delete .dll I get "Access denied". Any solution to that?

13. by . 2010-01-11 10:01:03
what can you do to fix this problem if you have already manually removed some of these files?

14. by . 2010-01-09 21:01:55
Didn't work. try manually getting rid of it

15. by . 2010-01-09 21:01:27
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....

16. by . 2010-01-07 02:01:24
ควาย

17. by . 2010-01-05 12:01:08
I tried to follow the manual removal guide, and succeded with every thing exept to get rid of the mdext.dll because I couldn´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.

18. by . 2009-12-30 01:12:27
Malwarebytes Installation freezes up when its almost done and everything not responds before its done.

19. by . 2009-12-29 10:12:33
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.

20. by . 2009-12-28 21:12:05
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...

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