How to Remove Trojan.multi.certstor.a Virus

This article can help you to remove Trojan.multi.certstor.a Virus. The step by step removal works for every version of Microsoft Windows.

The Trojan.multi.certstor.a is a classic Trojan horse. It enters your PC in complete silence and infects your entire system. The Trojan modifies essential for your OS files and processes. It also modifies the System Registry. All these changes happen in complete silence. You will not be able to notice these processes in time to stop the virus. Yet, once it’s set and rooted in your system, Trojan.multi.certstor.a wreaks havoc. The parasite interferes with every aspect of your daily PC activities. Every time you as much as touch your browser, the virus throws you into a whirlwind of advertisements. It causes your device to underperform. Some of your programs may freeze and crash frequently. Your anti-virus is very likely to be disabled. And on top of all this, your Internet Connection would seem slower than usual. All these issues are just the noticeable side effects of the virus. What happens inside your machine is far more worrisome. Trojan.multi.certstor.a communicates with its owners. The hackers can command it to perform various operations. It can install/uninstall programs, for example. Thus, the crooks can use it to further infect your PC. Malware, spyware, and ransomware can easily be transferred to your device. The Trojan is a breach of your security. Do not waste your time. Act against the infection. We have provided a manual removal guide below this article. Yet, be advised. Trojan.multi.certstor.a is a rather sophisticated parasite. Its manual removal is not easy. If you are not confident in your computer skills, use a powerful anti-virus app. Choose your removal method and act!

Remove Trojan.multi.certstor.a

How did I get infected with?

Trojan.multi.certstor.a relies on numerous distribution techniques. Torrents, email attachments, drive-by downloads etc. You know how it works. You receive a message from your bank, local post office or police station. The matter looks urgent. The sender looks legitimate, yet, you don’t want to open the attached file. Luckily, the message has a hyperlink which contains more information on the subject. You click on it and that is the precise moment you infect your computer. Links can also be corrupted. If you think about it, a mysterious link may redirect you to infected websites, too. Before you even open an email, verify the sender. If it is sent by an organization, go to their official website. Compare the email addresses listed there with the one you have received a message from. If they don’t match, delete the pretender. You can also enter the sender’s address into some search engine. If it was used for shady business, someone might have complained. Your caution can prevent most virus infections. Do your best to stay away from questionable websites and avoid using torrents.

Why is this dangerous?

Trojan.multi.certstor.a is a nasty parasite. It always runs in the background and causes errors. It causes software failures and will make you reboot your PC continuously. But, a simple restart won’t fix your problems. The parasite loads together with your OS. To stop it, you must delete its components. If you, neglect it, however, there will be consequences. Trojan.multi.certstor.a affects its individual victims in a different manner. What will happen with device depends on the hackers and what they need at the moment. If they lack cyber coins, they will use your device into a miner. They may also turn it into a part of a botnet. Or, they can simply use the Trojan to spy on you. The parasite may install spyware and monitor every detail of your activities. If the hackers find sensitive information, they can use it to blackmail you. What is even worse, the Trojan can easily infect your computer with other dangerous viruses. Like ransomware, for example. All possible outcomes are unwanted. Do not neglect the problem. Remove Trojan.multi.certstor.a before it is too late.

Manual Trojan.multi.certstor.a Removal Instructions

The Trojan.multi.certstor.a infection is specifically designed to make money to its creators one way or another. The specialists from various antivirus companies like Bitdefender, Kaspersky, Norton, Avast, ESET, etc. advise that there is no harmless virus.

If you perform exactly the steps below you should be able to remove the Trojan.multi.certstor.a infection. Please, follow the procedures in the exact order. Please, consider to print this guide or have another computer at your disposal. You will NOT need any USB sticks or CDs.

STEP 1: Track down Trojan.multi.certstor.a related processes in the computer memory

STEP 2: Locate Trojan.multi.certstor.a startup location

STEP 3: Delete Trojan.multi.certstor.a traces from Chrome, Firefox and Internet Explorer

STEP 4: Undo the damage done by the virus

STEP 1: Track down Trojan.multi.certstor.a related processes in the computer memory

  • Open your Task Manager by pressing CTRL+SHIFT+ESC keys simultaneously
  • Carefully review all processes and stop the suspicious ones.


  • Write down the file location for later reference.

Step 2: Locate Trojan.multi.certstor.a startup location

Reveal Hidden Files

  • Open any folder
  • Click on “Organize” button
  • Choose “Folder and Search Options”
  • Select the “View” tab
  • Select “Show hidden files and folders” option
  • Uncheck “Hide protected operating system files”
  • Click “Apply” and “OK” button

Clean Trojan.multi.certstor.a virus from the windows registry

  • Once the operating system loads press simultaneously the Windows Logo Button and the R key.


  • A dialog box should open. Type “Regedit”


Depending on your OS (x86 or x64) navigate to:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run] or
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] or

  • and delete the display Name: [RANDOM]

delete backgroundcontainer

  • Then open your explorer and navigate to: %appdata% folder and delete the malicious executable.

Clean your HOSTS file to avoid unwanted browser redirection

Navigate to %windir%/system32/Drivers/etc/host

If you are hacked, there will be foreign IPs addresses connected to you at the bottom. Take a look below:


Step 4: Undo the possible damage done by Trojan.multi.certstor.a

This particular Virus may alter your DNS settings.

Attention! this can break your internet connection. Before you change your DNS settings to use Google Public DNS for Trojan.multi.certstor.a, be sure to write down the current server addresses on a piece of paper.

To fix the damage done by the virus you need to do the following.

  • Click the Windows Start button to open the Start Menu, type control panel in the search box and select Control Panel in the results displayed above.
  • go to Network and Internet
  • then Network and Sharing Center
  • then Change Adapter Settings
  • Right-click on your active internet connection and click properties. Under the Networking tab, find Internet Protocol Version 4 (TCP/IPv4). Left click on it and then click on properties. Both options should be automatic! By default it should be set to “Obtain an IP address automatically” and the second one to “Obtain DNS server address automatically!” If they are not just change them, however if you are part of a domain network you should contact your Domain Administrator to set these settings, otherwise the internet connection will break!!!


  • Check your scheduled tasks to make sure the virus will not download itself again.

How to Permanently Remove Trojan.multi.certstor.a Virus (automatic) Removal Guide

Please, have in mind that once you are infected with a single virus, it compromises your whole system or network and let all doors wide open for many other infections. To make sure manual removal is successful, we recommend to use a free scanner of any professional antimalware program to identify possible virus leftovers or temporary files.

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