This article is dedicated to helping users remove Trojan Patched.AO and fix the DNSAPI.dll missing error, which may be connected to the trojan virus family, as users commonly refer to them. The DNSAPI.dll Missing Error can also be displayed on its own, but much of the time it is “broken” by the trojan in question.
Again, if you are here for the dnsapi.dll missing error, this may be related to a trojan virus called Win32/Patched.AO. The removal guide will provide solutions for both the error and the virus, if there is one.
Despite being predominantly called Viruses by most users, in reality Trojans are not, as surprising as this sounds. They are still very much malicious and dangerous, but the fine distinction between viruses and malware is that viruses can replicate and regenerate themselves even if you delete them. They have in-built capabilities to do so. Trojan Win32/Patched.AO and DNSAPI.dll Missing Error can not. Facts point that if you manage to remove them once, they will not come back to bother you again. That is why there is an entirely different classification called “malware” and this is the one the trojan belongs to.
What is a Trojan?
The simplest explanation is the classical one. Just as the famous trojan horse it was named after, this type of malware serves as a front or back door, depending how you look at it. They basically get in and leak information to whoever created them, as well as serve as a weak point in the security system of your computer. If a Trojan is associated with another virus it can help that virus install itself on your machine without your authorization or knowledge. Hackers who create Trojans are often paid by hackers who make other viruses in order to use the network of infected computers to distribute their malicious work.
How does DNSAPI.dll Missing Error factor in the work of the Trojan?
The DNSAPI.dll file is a library file used by Windows in task related to internet access and for this reason it is often targeted by threats like Trojan Win32/Patched.AO. It is used by Window’s DNS Client API and if it has been tampered with or corrupted Windows cannot process the settings inside, thus causing a variety of DNS Client error files to pop up. A list of these errors include:
- This application failed to start because DNSAPI.DLL was not found. Re-installing the application may fix this problem.
- Dnsapi.dll not found.
- The file Dnsapi.dll is missing.
- Dnsapi.dll Access Violation.
- Cannot register dnsapi.dll.
- Cannot find C:WindowsSystem32\dnsapi.dll.
These errors will most often pop during start-up after a system power-on/reboot, but they can also appear when another program on your computer tries to access Dnsapi.dll. These errors are a sure sign you have a serious Trojan-related problem.
DO NOT try to simply replace Dnsapi.dll on your computer without dealing with the Trojan! It will remain installed on your compter and also there are many fake sites that offer manipulated .dll files. Even if the error disappears it could be because the .dll file is written more cleverly and Windows cannot recognize that the file is not the original one.
If you are seeing any of these errors on your computer then you must take adequate action against Trojan Win32/Patched.AO. The fact that Dnsapi.dll has been changed renders your computer vulnerable and also makes any firewall you have impotent in adequately dealing with attempts to install viruses on your computer. The more you wait the greater the chances you will have a bigger collection of other threats to deal with.
|Name||Patched.AO and DNSAPI.dll|
|Type||Potentially Unwanted Programs and Files|
|Symptoms||Unwanted Ads and Toolbars, search engine redirects.|
|Distribution Method||Software bundles, Email attachments, online Ads, infected torrent files.|
|Detection Tool||parasite may be difficult to track down. Use SpyHunter - a professional parasite scanner - to make sure you find all files related to the infection.|
Remove Trojan Patched.AO and DNSAPI.dll
Things readers are interested in:
Our first step here is a reboot in Safe Mode. If you already know how to do it, just skip this and proceed to Step 2. If you do not know how to do it, continue reading:
For Windows 98, XP, Millenium and 7 Users:
Restart your computer. To be sure you don’t miss the time when you need to press it, just spam F8 as soon as the PC starts booting. In the new menu, choose Safe Mode With Networking.
Proceed to Step 2.
For W. 8 and 8.1 Users:
Click the Start button ,then Control Panel —> System and Security —> Administrative Tools —> System Configuration.
Then check the Safe Boot option and click OK. Click Restart in the new pop-up.
Proceed to Step 2.
For Windows 10 Users:
- Open the Start menu.
- Click the power button icon in the right corner of the new Start menu to show the power options menu.
- Press and hold down the SHIFT key on the keyboard and click the Restart option while still holding down the SHIFT key.
Windows 10 will perform the reboot. Next do the following:
Click the Troubleshoot icon, then Advanced options —> Startup Settings. Click Restart.
After the reboot click on Enter Safe Mode With Networking (Fifth Option).
Continue with Step 2.
Once you have rebooted in Safe Mode (if you skipped the previous step, go back and do it) type cmd in the Search Field. Righ Click on it and choose Run as Administrator. In the new window that will appear type sfc /scannow and press Enter. Wait for the verification process to finish. You should get the following message:
At this point, you successfully removed the DNSAPI.dll missing error. The error can manifest on its, but it’s often caused by the presence of a trojan. It’s time to check if there is a trojan in your system and deal with it. More than likely it should be Trojan Win32/Patched.AO
To remove parasite, you may have to meddle with system files and registries. Making a mistake and deleting the wrong thing may damage your system.
Avoid this by using SpyHunter - a professional Parasite removal tool.
Hold the Windows Key and R and copy + paste the following, then click OK:
A .txt file will open – don’t touch anything there. If you are hacked and someone has access to your PC, there will be a bunch of other IPs connected to you at the bottom. This is what a hosts file looks like:
If there are a bunch of strange IPs connecting to you below “Localhost” you may be hacked, and it’s best to ask us in the comments for directions.
Now hold the windows Key and R again but type %temp% in the field and hit enter. Delete everything in that directory.
Right click on each of the malware processes separately and select Open File Location. Also, End the process after you open the folder. Just to make sure we don’t delete any programs you mistakenly took for a malware, copy the folders somewhere, then delete the directories you were sent to. There’s a good chance Trojan Win32/Patched.AO is hiding somewhere in here.
A BIG WARNING HERE! READ THIS BEFORE PROCEEDING!
This is perhaps the most important and difficult step, so be extremely careful. Doing this can damage your PC significantly if you make a big mistake. If you are not feeling comfortable, we advise you to download a professional rojan Win32/Patched.AO remover. Additionally, accounts connected to your credit cards, or important information, may be exposed to the virus.
Take a look at the following things:
Type msconfig in the search field and hit enter: you will be transported to a new window.
Go in the Startup tab and Uncheck anything that has “Unknown” as Manufacturer.
Type Regedit in the windows search field and press Enter.
Once inside, press CTRL and F together and type the malware’s Name. Right click and delete any entries you find with a similar name. If you can’t find them this way, look in these directories, and delete the registries manually:
- HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious, but bear in mind they are always different.
HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random
If these things fail to help you find rojan Win32/Patched.AO you need to resort to a professional scanner – obviously this is a malware that was created to steal your credentials and credit cards – meaning the people who created it spent a lot of resources to make it as dangerous as possible.