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Grobios Trojan — How to Remove Active Infections from Your PC

This article has been created in order to explain what is the Grobios Trojan and how to remove this malware completely from your computer.

The Grobios Trojan is a dangerous virus threat that has recently been identified in a hacker campaign. It contains advanced code that can cause a lot of damage to the infected hosts, including remote surveillance of the users in real-time. Read more about recovering infected hosts in our complete Grobios Trojan removal guide.

Threat Summary

Name Grobios
Type Trojan Horse Virus
Short Description Silently infects the target machines and modifies key applications and system services.
Symptoms The user may not experience any signs of infiltration.
Distribution Method Malicious web links, Malicious Files, Malicious E-Mails
Detection Tool See If Your System Has Been Affected by malware


Malware Removal Tool

User Experience Join Our Forum to Discuss Grobios.

Grobios – How Does It Infect

The Grobios Trojan is a potent weapon that can be delivered using various methods. Depending on the target users the operators can choose the most adequate tool. A preferred method may be the use of email SPAM messages that utilize social engineering techniques. Usually they contain hijacked content from legitimate sites and services in the form of text and graphics. Counterfeit notification messages can be crafted that can include the Trojan instances. In addition the emails can also be used to spread infected payload carriers, two popular types are the following:

  • Software Installers — The hackers can embed the Grobios Trojan code in application installers of various types: system utilities, creativity suites, productivity programs and even computer games.
  • Infected Documents — The hackers behind the Grobios Trojan can infect documents using the same mechanism. Targets can be presentations, text documents or spreadsheets. The typical behavior is to integrate dangerous scripts in them, when they are opened a notification message will appear asking the victim users to enable the built-in macros. If this is done the malicious script is activated and the infection follows.

These payloads can be distributed on hacker-controlled sites as well as file sharing networks like BitTorrent. In a manner similar to the emils they can use text and graphics taken from well-known sites and services and customize them with a similar domain name. When malicious scripts are used they can take form of banners, pop-ups, redirects and in-content links. Using advertising and affiliate networks the malicious instance can also take over legitimate sites.

The Grobios Trojan can be deployed to hackers using browser hijackers that represent malicious browser plugins. They are usually uploaded to the relevant plugin repositories with fake developer credentials and user reviews. Detailed descriptions with promises of new features are the main social engineering tactic. Once they are deployed to the systems changes usually follow to the default settings as the criminals redirect the victims to a hacker-controlled page. They also install various tracking cookies to the victim computers. After this is complete the malware infections follows.

At the moment the biggest distribution channel used by the Grobios Trojan remains the use of the RIG Exploit Kit which is used in email campaigns and malvertising sites.

Grobios – More Information and Analysis

The Grobios Trojan is a newly released threat that is being actively pushed to computer victims. The infection starts with an advanced stealth protection module. This module is programmed to protect the virus instance from security software and products that can interfere with its correct execution. This includes anti-virus products, virtual machine hosts and sandbox environments.

When the infected host has been bypassed completely the virus code is multiplied in several locations, including the Program Files (x86) folder. This actions is performed to prevent the users from manually removing the instances by themselves. Furthermore the Trojan is copied to a Google folder with a random name and uses Google Chrome’s icon to hide itself as an asset used by the web browsers.

The security analysis shows that the threat is also set up as a persistent installation. This means that the code is made to execute every time the computer boots. In connection with this Grobios may also delete sensitive user data. This is usually connected with the Shadow Volume Copies which are used for data recovery. When such steps are taken the victims can use our detailed recovery instructions which shows how the data can be recovered.

System changes to the Windows Registry can follow. When the Trojan code acts against user-installed software it can render certain features and services unusable. When this is done against the operating system itself the victims will experience overall performance issues.

The main malicious engine associated with this threat is the actual network connection module. It connects to a hacker-controlled server which is sued to collect the harvested information. Depending on the hacker commands it can be used for different malicious activity such as the following:

  • Sensitive Data Harvest — The Grobios Trojan engine can be programmed into obtaining information that can expose the victim’s identity. Examples include strings like their name, address, interests, location, passwords and account credentials. Part of the information can be used to optimize the attack campaigns.
  • Surveillance — The hackers can spy on the victims in real time, as well as take over their computers. This action is also used for theft of personal files.
  • Malware Deployment — The Grobios Trojan can be used to deliver additional threats to the victim hosts which forms a type of second-stage infection strategy.
  • System Modification — The Trojan code has been found to include functionality that can modify the host systems. This includes the opening of network ports, process manipulation, configuration files modifications and etc.

One of the dangerous aspects when encountering Grobios Trojan strains is the notion that every infection campaign can carry a custom version of the malware. As a result future versions of it can use a completely different behavior pattern. Some of the signatures that anti-virus companies have devised for it include the following identifiers: BKDR_ANDROM.COGAZ, Trojan.Generic.D1CF9DB1, Trojan.Win32.Inject.aivlz, Trojan/Win32.Occamy.C2431572 and others.

Remove Grobios Effectively from Windows

In order to fully get rid of this cryptocurrency miner Trojan, we advise you to follow the removal instructions underneath this article. They are made so that they help you to isolate and then delete the Grobios Trojan either manually or automatically. If manual removal represents difficulty for you, experts always advise to perform the removal automatically by running an anti-malware scan via specific software on your PC. Such anti-malware program aims to make sure that the Grobios is fully gone and your Windows OS stays safe against any future malware infections.

Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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How to Remove Grobios from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove Grobios


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 Grobios 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 Grobios 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 Grobios 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 Grobios 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.

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Get rid of Grobios from Mac OS X.

Step 1: Uninstall Grobios 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 Grobios:

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 Grobios. 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 Grobios. 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 Grobios 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 Grobios. 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 Grobios files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as Grobios, 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 Grobios:


SpyHunter for Mac

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

Remove Grobios 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.

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Erase Grobios 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.

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Uninstall Grobios 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.

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Remove Grobios 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 Grobios 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.

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Eliminate Grobios 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 Grobios 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".

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