Home > Mac Viruses > Basesystem.dmg Virus File – How to Delete It (Mac)

Basesystem.dmg Virus File – How to Delete It (Mac)

This article has been created to help explain what is the basesystem.dmg file and how you can remove it from your Mac permanently.

Basesystem.dmg “Virus” File

A file, called Basesystem.dmg has been reported by users on Apple Community forums to request victims to enter their passwords and IDs to delete it. The file, however seems to not go away via these methods and returns a “denied access” type of error message. This is likely because the Basesystem.dmg file may be running on your Mac as a result of a virus possible residing in it and conducting malicious activity. If you want to remove the Basesystem.dmg virus effectively from your Mac, we recommend that you read this article thoroughly.

Threat Summary

Name Basesystem.dmg Virus
Type Virus for Mac OS
Short Description May contain spyware elements in it and may conduct malicious activities in the background of your Mac.
Symptoms Runs actively in the background and cannot be shut down or deleted.
Distribution Method Via malicious e-mail spam messages or via malicious web links.
Detection Tool See If Your System Has Been Affected by malware


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User Experience Join Our Forum to Discuss Basesystem.dmg Virus.

Basesystem.dmg – How Did I Get It

The main method via which you may have started seeing this [wplinkpreview url=”https://sensorstechforum.com/popular-windows-file-types-used-malware-2018/”].dmg file is believed to be via web links or files that are sent directly to victims. Since the Basesystem.dmg is a file that contains some form of MacOS installer, it may only pretend it is such to fool users. In reality, the infection file of this virus is believed to be spread via e-mail by being uploaded as a seemingly legitimate document of what appears to be an important nature. The e-mails may also be cleverly designed to imitate legitimate messages coming from big companies, like PayPal, eBay and others.

In addition to via e-mail, the Basesystem.dmg may come as a result of an installation of an app you may have downloaded from a suspicious third-party site. These types of programs may appear as useful and free, but once they are installed, they are very hard to remove and their general purpose is to show advertisements and run suspicious processes, like Basesystem.dmg.

Basesystem.dmg – More Information

Once the Basesystem.dmg file is ran on your Mac, it may begin performing different malicious activities. These may be of all tpes, but the main one is spyware and virus actions. The bad news here is that once you try to delete Basesystem.dmg, the Mac asks to enter the password and identify as an administrator. If you have done that, we strongly suggest that you change your passwords immediately. In addition to this, when users try to stop the file in Activity Monitor and enter their passwords, the following notification is returned:

“The operation can’t be completed because you don’t have permission to access some of the items”

In addition to this, the Basesystem.dmg may perform various malicious activities on the Macs of victims, such as:

  • Obtain and log the keystrokes you type.
  • Take screenshots on your Mac.
  • Take control of your Mac’s camera.
  • Copy files from your Mac.
  • Update itself.
  • Download other malware.

But this is not all of the risks that are associated with Basesystem.dmg virus, since it may also download and run a miner on your Mac that may use your CPU and GPU power to conduct cryptocurrency mining actions at your expense.

Remove Basesystem.dmg from Your Mac

If you want to remove the Basesystem.dmg virus from your Mac, we recommend that you backup your files beforehand, just in case.

To remove Basesystem.dmg virus, we recommend that you follow the removal instructions underneath. They have been created with the main idea to help you to remove this virus’s files from your Mac either manually or automatically. The main idea behind this is to assist you in deleting the virus the best way suitable for you. Be advised that the most effective removal method still remains to be via an advanced anti-malware program that can cope with Mac viruses. Such software aims to scan your Mac for different unwanted and malicious files and then secure it completely plus make sure that your Mac remains 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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with SpyHunter for Mac
Basesystem.dmg Virus may remain persistent on your system and may re-infect it. We recommend you to download SpyHunter for Mac and run free scan to remove all virus files on your Mac. This saves you hours of time and effort compared to doing the removal yourself.
Free Remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy

Steps to Prepare Before Removal:

Before starting to follow the steps below, be advised that you should first do the following preparations:

  • Backup your files in case the worst happens.
  • Make sure to have a device with these instructions on standy.
  • Arm yourself with patience.
  • 1. Scan for Mac Malware
  • 2. Uninstall Risky Apps
  • 3. Clean Your Browsers

Step 1: Scan for and remove Basesystem.dmg Virus files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as Basesystem.dmg Virus, 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 Basesystem.dmg Virus:


SpyHunter for Mac

scan and remove mac virus step 1

Quick and Easy Mac Malware Video Removal Guide

Bonus Step: How to Make Your Mac Run Faster?

Mac machines maintain probably the fastest operating system out there. Still, Macs do become slow and sluggish sometimes. The video guide below examines all of the possible problems that may lead to your Mac being slower than usual as well as all of the steps that can help you to speed up your Mac.

Step 2: Uninstall Basesystem.dmg Virus 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:

remove mac virus step 1

2. Find Activity Monitor and double-click it:

remove mac virus step 2

3. In the Activity Monitor look for any suspicious processes, belonging or related to Basesystem.dmg Virus:

remove mac virus step 3

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

remove mac virus step 4

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 Basesystem.dmg Virus. If you find it, right-click on the app and select “Move to Trash”.

remove mac virus step 5

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 Basesystem.dmg Virus. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7. Remove any leftover 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 Basesystem.dmg Virus 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:

fix mac virus from launch agents step 1

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

fix mac virus from launch agents step 2

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

fix mac virus from launch agents step 3

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 3: Remove Basesystem.dmg Virus – related extensions from Safari / Chrome / Firefox

Remove an extension from Safari and reset it.Remove a toolbar from Google ChromeRemove a toolbar from Mozilla Firefox

1. Start Safari

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

3. From the menu, click on "Preferences"

Remove Mac virus from safari step 1

4. After that, select the 'Extensions' Tab

Remove Mac virus from safari step 2

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

6. Click 'Uninstall'

Remove Mac virus from safari step 3

A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the Basesystem.dmg Virus 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.

1. Start Google Chrome and open the drop menu

remove mac virus from google chrome step 1

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

remove mac virus from google chrome step 2

3. From the opened "Extensions" menu locate the add-on and click on the garbage bin icon on the right of it.

remove mac virus from google chrome step 3

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

1. Start Mozilla Firefox. Open the menu window

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

remove mac virus from mozilla firefox step 1

3. Select the Extension and click "Remove"

remove mac virus from mozilla firefox step 2

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

Basesystem.dmg Virus-FAQ

What is Basesystem.dmg Virus on your Mac?

The Basesystem.dmg Virus threat is probably a potentially unwanted app. There is also a chance it could be related to Mac malware. If so, such apps tend to slow your Mac down significantly and display advertisements. They could also use cookies and other trackers to obtain browsing information from the installed web browsers on your Mac.

Can Macs Get Viruses?

Yes. As much as any other device, Apple computers do get malware. Apple devices may not be a frequent target by malware authors, but rest assured that almost all of the Apple devices can become infected with a threat.

What Types of Mac Threats Are There?

According to most malware researchers and cyber-security experts, the types of threats that can currently infect your Mac can be rogue antivirus programs, adware or hijackers (PUPs), Trojan horses, ransomware and crypto-miner malware.

What To Do If I Have a Mac Virus, Like Basesystem.dmg Virus?

Do not panic! You can easily get rid of most Mac threats by firstly isolating them and then removing them. One recommended 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 Mac anti-malware apps out there that you can choose from. SpyHunter for Mac is one of the reccomended Mac anti-malware apps, that can scan for free and detect any viruses. This saves time for manual removal that you would otherwise have to do.

How to Secure My Data from Basesystem.dmg Virus?

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 Apple devices will become significantly more safe against any threats or information invasive software and be virus free and protected in the future too.

More tips you can find on our MacOS Virus section, where you can also ask any questions and comment about your Mac problems.

About the Basesystem.dmg Virus Research

The content we publish on SensorsTechForum.com, this Basesystem.dmg Virus how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific macOS issue.

How did we conduct the research on Basesystem.dmg Virus?

Please note that our research is based on an independent investigation. We are in contact with independent security researchers, thanks to which we receive daily updates on the latest malware definitions, including the various types of Mac threats, especially adware and potentially unwanted apps (PUAs).

Furthermore, the research behind the Basesystem.dmg Virus threat is backed with VirusTotal.

To better understand the threat posed by Mac malware, please refer to the following articles which provide knowledgeable details.

  1. EasonTek

    Excuse me, BaseSystem.dmg is a DMG that is downloaded and used in real macs for internet recovery and is hidden in macOS installers, just in case.

    1. Ventsislav Krastev (Post author)

      Yes, what you are saying is completely correct however the problem here is many malware for Mac may imitate the name of the original BaseSystem.dmg process to conceal its sinister activities from the casual user who is siphoning through Activity Monitor. As long as the malware has administrative permissions, this may be just one more step to hide its activities.


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