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How to Remove Authrootstl.cab Certificate Malware Error from Your PC

This instructive article aims to explain to you what is Authrootstl.cab Trojan Horse and how to remove it from your computer completely.

A new Win32 infection, taking advantage of the Authrootstl.cab file in Windows has been detected. The virus is believed to be a Trojan horse, most likely a Kelihos Trojan variant and it may perform a set of malicious activities, such as collect account information, log keystrokes and perform a set of other activities on your computer system, like DDoS attacks, monitor the network traffic and even send spam e-mails from the victim’s IP address. If your computer has been infected by the Authrootstl.cab malware, it is strongly recommended to immediately to detect and remove it, preferably by using information like the one stated in this article.

Threat Summary

Name Authrootstl.cab Trojan
Type Trojan Horse
Short Description May download other malware on the infected server/computer or may include it in a botnet (zombie network). May also steal information from it.
Symptoms You may see errors with the certificate of the Authrootstl.cab file. Other than that, the malware aims to stay undetected, showing no symptoms of presence.
Distribution Method Spam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by malware


Malware Removal Tool

User Experience Join Our Forum to Discuss Authrootstl.cab Trojan.

Authrootstl.cab Malware – How Did I Get Infected

This Trojan horse is a bit more sophisticated than other malware, since it has a lot of functions, that are pre-programmed to ensure that your computer is at the hacker’s disposal. The infection methods are not so sophisticated, in fact there has been only one that is reported so far and it is via malicious e-mail messages being spammed. The messages are of different character and contain the virus infection file embedded as an e-mail attachment, which poses as a legitimate document. Here is an approximate example of how spam e-mails carrying the Authrootstl.cab malware as an attachment may appear like:

Dear Customer,
We could not deliver your parcel.
You can review complete details of your order in the file attached.

Warm regards,
Marshall Hampton,
Sr. Operation Agent.

The usual form of the attachment is an executable file that is archived in a .zip or .rar archive. However, the file may also be a Microsoft Office document, embedded with a malicious macros inside of it. If the file is a fake document, the following activities happen:

Besides an e-mail attachment, the malicious file may also be uploaded on a third-party website and a link to it may be posted in the e-mail. The black hat hackers usually use Google Drive, Dropbox and other online file-sharing services, since they are not blocked by e-mail providing companies.

Authrootstl.cab Malware – Analysis

When an infection with the Authrootstl.cab malware takes place, the virus immediately modifies the Windows Registry Editor by adding registry values in the following locations:

→ HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

After this has been done, the malware connects to the following web links in order to download the root certificates via the files authrootstl.cab and authrooseq.txt.

→ https://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt

This ensures that the Authrootstl.cab malware stays obfuscated and undetected as an administrator of your computer.

When this is done, the malware, associated with Authrootstl.cab, connects to multiple hosts, reported by researchers to be the following:


After connecting to them, the virus uses multiple web resources and Windows functions in order to perform the following activities on the infected computer:

  • Encrypt it’s outgoing and incoming communication.
  • Receive a list of computers to be attacked by automatically sending spam e-mail messages to them from the infected computer.
  • Include the victim computer in a botnet (zombie network) of computers.
  • Turn the infected computer or server to serve as a proxy network for the hacker.
  • Monitor what you do online.
  • Collect the keystrokes typed by you.

In addition to the many activities of this Trojan, it also aims to steal your offline BitCoin wallet, if there is such present on your computer. This is done by scanning for your wallet.dat file, usually located in the %AppData% directory:

→ %AppData%\Bitcoin\wallet.dat

Furthermore, it is unknown as of yet why, but the Authrootstl.cab malware also scans for the following files on the infected computer:

→ avi mov wmv mp3 wave wav wma ogg vob png jpg jpeg gif bmp exe dll ocx class msi zip 7z rar jar gz hxw hxh hxn hxd

After doing so, the Authrootstl.cab malware may have the ability to directly copy those files and send them over to the server of the hacker.

Another activity, which this Trojan is created to perform is to send spam e-mails to a large pre-configured list of e-mail addresses. This is done with the one and only purpose to either influence those servers or computers with what is written in the message or infect them with a version of itself via the spam mails. The messages sent are usually related to stock price speculation, but they may become different at any time in the future. Here is one e-mail sent from an infected server with this Trojan:

“Breaking News: Worldwide Market Demand for Gold Might Hit to $221 . 5 Billion this Year. One company made sure to secure their claims for the richest gold
find – worth of billions of the GOLD

The symbol is SR_G__L

Go getting some of SR_G_L on Monday in the low $0.27


Company Name: Source Gold Corp,

Latest Pricmgt $.027

Short Term Target Pace” 80.39

Tap into the Nat Gold Rush Global gold demand could top 4,400 tons in 2012
worth 8221.5 bilion – an increase of16% over 2011. Early-in investors in

this ONE stock up can surely convert ten grands into fifiy. Acqu’ue SR_G_L

on Monday October 8th. call you broker or visit Etrade!”

Remove Authrootstl.cab Malware from Your Computer

To show you how to eliminate Authrootstl.cab malware, we have created removal instructions in the steps below. They can help you isolate the threat and look for all the registries and files it has created on your computer system. However, for fast and effective removal, security professionals often recommend to use an advanced anti-malware program, that is sure to help you remove Authrootstl.cab malware automatically and fully and detect other malware as well, if present on your PC. Furthermore, installing such software also makes sure that your computer stays protected against future infections as well.

Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

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About the Authrootstl.cab Trojan Research

The content we publish on SensorsTechForum.com, this Authrootstl.cab Trojan how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific, adware-related problem, and restore your browser and computer system.

How did we conduct the research on Authrootstl.cab Trojan?

Please note that our research is based on independent investigation. We are in contact with independent security researchers, thanks to which we receive daily updates on the latest malware, adware, and browser hijacker definitions.
Furthermore, the research behind the Authrootstl.cab Trojan threat is backed with VirusTotal https://www.virustotal.com/gui/home/upload.
To better understand this online threat, please refer to the following articles which provide knowledgeable details.


1.Browser Redirect – What Is It?
2.Adware Is Malicious, and It Uses Advanced Techniques to Infect
3.The Thin Red Line Between Potentially Unwanted Programs and Malware
4.The Pay-Per-Install Affiliate Business – Making Millions out of Adware
5.Malicious Firefox Extensions Installed by 455,000 Users Blocked Updates

How to Remove Authrootstl.cab Trojan from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove Authrootstl.cab Trojan


Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key + R

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall Authrootstl.cab Trojan and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by Authrootstl.cab Trojan on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Authrootstl.cab Trojan there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.

Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for Authrootstl.cab Trojan with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.


If any threats have been removed, it is highly recommended to restart your PC.

Video Removal Guide for Authrootstl.cab Trojan (Windows).

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Get rid of Authrootstl.cab Trojan from Mac OS X.

Step 1: Uninstall Authrootstl.cab Trojan and remove related files and objects

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1.Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3.In the Activity Monitor look for any suspicious processes, belonging or related to Authrootstl.cab Trojan:

Tip: To quit a process completely, choose the “Force Quit” option.

4.Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5.In the Applications menu, look for any suspicious app or an app with a name, similar or identical to Authrootstl.cab Trojan. If you find it, right-click on the app and select “Move to Trash”.

6: Select Accounts, after which click on the Login Items preference.

Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to Authrootstl.cab Trojan. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove Authrootstl.cab Trojan via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as Authrootstl.cab Trojan. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Step 2: Scan for and remove Authrootstl.cab Trojan files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as Authrootstl.cab Trojan, the recommended way of eliminating the threat is by using an anti-malware program. SpyHunter for Mac offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.

Click the button below below to download SpyHunter for Mac and scan for Authrootstl.cab Trojan:


SpyHunter for Mac

Video Removal Guide for Authrootstl.cab Trojan (Mac)

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Remove Authrootstl.cab Trojan from Google Chrome.

Step 1: Start Google Chrome and open the drop menu

Step 2:Move the cursor over "Tools" and then from the extended menu choose "Extensions"

Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.

Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Erase Authrootstl.cab Trojan from Mozilla Firefox.

Step 1: Start Mozilla Firefox. Open the menu window

Step 2: Select the "Add-ons" icon from the menu.

Step 3: Select the unwanted extension and click "Remove"

Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Uninstall Authrootstl.cab Trojan from Microsoft Edge.

Step 1: Start Edge browser.

Step 2: Open the drop menu by clicking on the icon at the top right corner.

Step 3: From the drop menu select "Extensions".

Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.

Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Remove Authrootstl.cab Trojan from Safari.

Step 1: Start the Safari app.

Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.

Step 3: From the menu, click on "Preferences".

stf-safari preferences

Step 4: After that, select the 'Extensions' Tab.


Step 5: Click once on the extension you want to remove.

Step 6: Click 'Uninstall'.

stf-safari uninstall

A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the Authrootstl.cab Trojan will be removed.

How to Reset Safari
IMPORTANT: Before resetting Safari make sure you back up all your saved passwords within the browser in case you forget them.

Start Safari and then click on the gear leaver icon.

Click the Reset Safari button and you will reset the browser.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Eliminate Authrootstl.cab Trojan from Internet Explorer.

Step 1: Start Internet Explorer.

Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'

Step 3: In the 'Manage Add-ons' window.

Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.

Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.

Remove Push Notifications caused by Authrootstl.cab Trojan from Your Browsers.

Turn Off Push Notifications from Google Chrome

To disable any Push Notices from Google Chrome browser, please follow the steps below:

Step 1: Go to Settings in Chrome.


Step 2: In Settings, select “Advanced Settings”:

advanced settings

Step 3: Click “Content Settings”:

Content Settings

Step 4: Open “Notifications”:


Step 5: Click the three dots and choose Block, Edit or Remove options:

Block, Edit or Remove

Remove Push Notifications on Firefox

Step 1: Go to Firefox Options.


Step 2: Go to “Settings”, type “notifications” in the search bar and click "Settings":


Step 3: Click “Remove” on any site you wish notifications gone and click “Save Changes”

remove push notifications firefox

Stop Push Notifications on Opera

Step 1: In Opera, press ALT+P to go to Settings.


Step 2: In Setting search, type “Content” to go to Content Settings.

content settings

Step 3: Open Notifications:


Step 4: Do the same as you did with Google Chrome (explained below):

three dots

Eliminate Push Notifications on Safari

Step 1: Open Safari Preferences.


Step 2: Choose the domain from where you like push pop-ups gone and change to "Deny" from "Allow".

Authrootstl.cab Trojan FAQ

What is Authrootstl.cab Trojan?

The Authrootstl.cab Trojan threat is adware or browser redirect virus. It may slow your computer down siginficantly and display advertisements. The main idea is for your information to likely get stolen or more ads to appear on your device.

The creators of such unwanted apps work with pay-per-click schemes to get your computer to visit risky or different types of websites that may generate them funds. This is why they do not even care what types of websites show up on the ads. This makes their unwanted software indirectly risky for your OS.

What are the symptoms of Authrootstl.cab Trojan?

There are several symptoms to look for when this particular threat and also unwanted apps in general are active:

Symptom #1: Your computer may become slow and has poor performance in general.

Symtpom #2: You have toolbars, add-ons or extensions on your web browsers that you don't remember adding.

Symptom #3: You see all types of ads, like ad-supported search results, pop-ups and redirects to randomly appear.

Symptom #4: You see installed apps on your Mac running automatically and you do not remember installing them.

Symptom #5: You see suspicious processes running in your Task Manager.

If you see one or more of those symptoms, then security experts reccomend that you check your computer for viruses.

What types of Unwanted Programs are there?

According to most malware researchers and cyber-security experts, the threats that can currently affect your Mac can be the following types:

  • Rogue Antivirus programs.
  • Adware.
  • Browser hijackers.
  • Clickers.
  • Fake optimizers.

What to do if I have a "virus" like Authrootstl.cab Trojan?

Do not panic! You can easily get rid of most adware or unwanted program threats by firstly isolating them and then removing them from your browser and computer. One reccomended way to do that is by using a reputable malware removal software that can take care of the removal automatically for you. There are many anti-malware apps out there that you can choose from. SpyHunter is one of the reccomended anti-malware apps, that can scan your computer for free and detect any viruses, tracking cookies and unwanted adware apps and eliminate them quickly. This saves time when compared to doing the removal manually.

How to secure my passwords and other data from Authrootstl.cab Trojan?

With few simple actions. First and foremost, it is imperative that you follow these steps:

Step 1: Find a safe computer and connect it to another network, not the one that your Mac was infected in.

Step 2: Change all of your passwords, starting from your e-mail passwords.

Step 3: Enable two-factor authentication for protection of your important accounts.

Step 4: Call your bank to change your credit card details (secret code, etc.) if you have saved your credit card for online shopping or have done online activiites with your card.

Step 5: Make sure to call your ISP (Internet provider or carrier) and ask them to change your IP address.

Step 6: Change your Wi-Fi password.

Step 7: (Optional): Make sure to scan all of the devices connected to your network for viruses and repeat these steps for them if they are affected.

Step 8: Install anti-malware software with real-time protection on every device you have.

Step 9: Try not to download software from sites you know nothing about and stay away from low-reputation websites in general.

If you follow these reccomendations, your network and all devices will become significantly more secure against any threats or information invasive software and be virus free and protected in the future too.

More tips you can find on our website, where you can also ask any questions and comment underneath the articles about your computer problems. We will try to respond as fast as possible.

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