THREAT REMOVAL

JS:MINER-C Trojan Miner – WHAT IS IT and How to Remove It

This article has been created in order to help explain what is the JS:MINER [Trj] miner malware and how to detect and remove it from your computer system.

A new miner malware, detected to be spread via the web browsers of the victims, using JavaScript has been reported to be existing and spreading and multiple different virus variants. The infection is a Trojan horse, infecting via JavaScript, hence it’s detection name JS:MINER [Trj] by major antivirus companies, like AVG and Avast. In the event that your computer has experienced the JS:MINER malware infection, recommendations are to read this article in order to learn how to fully erase this malware and prevent it from mining cryptocurrencies, like BitCoin or Monero on your computer.

Threat Summary

Name JS:MINER
Type CryptoCurrency Miner
Short Description Aims to mine for various cryptocurrencies on your computer system(one or more), using it’s resources.
Symptoms Your computer is heavily overloaded and you may experience cooling fan noises, system performance slow-downs and interruptions.
Distribution Method Via malicious software, previously infected your PC, fake setups and malicious executables, disguised as legitimate ones. Macro infections are also a possibility.
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JS:MINER Malware – How Does It Spread

A new cryptocurrency miner trojan was recently detected to mine various different types of cryptocurrencies via JavaScript. The malware has been dtected by several major antivirus companies t perofrm significatn miner activities via comrpomised software or websites.

In order to infect your computer, the malware primarily uses malicious websites. Such websites may be introduced on your computer as a result of having a Trojan horse or other type of malware or unwanted software previously infected your computer. In addition to this, the JS:MINER malware may also cause an infection by you having to click on a web link believing to be legitimate. Such web links may be concealed in malicious websites as download buttons or sent to you via e-mail, pretending to be legitimate messages with the link, disguised as a “button”, like the malicious e-mail, cleverly disguised as a legitimate Dropbox e-mail.

One of the main infection methods used to infect computers with JS:Miner:C is likely conducted via a Trojan horse, which may land on your computer as a result of a malicious e-mail attachment sent to you via e-mail, like the following.

Another particular infection source of this virus is related to a web link, according to researchers who have reported it on Avast forums.

JS:MINER Malware – Activity

Once it has infected your computer, the JS:MINER malware may come in several different variants, like:

  • JS:MINER-A
  • JS:MINER-B
  • JS:MINER-C
  • JS:MINER-D
  • JS:MINER-E
  • JS:MINER-F
  • JS:MINER-G
  • JS:MINER-H
  • JS:MINER-I

Those are the variants of the malware that have so far been detected, the most prominent of which is the C version of the malware. When it infects your computer, this miner may also drop payload files directly on your computer, since it is classified as a Trojan Horse infection in general:

  • %AppData%
  • %Local%
  • %LocalLow%
  • %Roaming%
  • %Temp%
  • %Windows%

After the files of the virus are already on your computer, the malware may begin to perform different activities that make it run processes as an administrator on your computer and schedule tasks for automatic execution. This may result in various different activities to occur on your computer:

  • It’s CPU usage may increase significantly.
  • Increase in GPU utilization.
  • It may freeze.
  • Significant reduction of its performance.

These are side effects of this virus connecting your computer to a so-called mining pool. Such pools often aim to combine many infected computers by the JS:MINER viruses to the same mining wallet, increasing it’s mining power and hence generating more of the designated cryptocurrency the hackers behind these viruses have created. This results in them generating more cryptocurrency tokens at a smaller time frame as they infect more and more computers in time.

In addition to mining your computer for cryptocurrencies, the JS:MINER malware may also perform other activities on it, such as:

  • Take screenshots of your desktop.
  • Log your keystrokes.
  • Obtain information about BitCoin wallets installed on your computer.
  • Steal passwords and registration ID’s.
  • Steal system information.
  • Steal network information.

Even though it is not known for sure, the malware may do anything to remain hidden on your computer for longer periods of time and this includes updating itself plus downloading other malware or create copies of itself that are on standby in case you delete the original miner file manually. The virus may also perform activities on your computer that may result in JS:MINER mining your computer fileless, in other words by using your web browser without any files that are dropped on your PC.

JS:MINER Virus Family – How to Detect and Remove

In order to detect a JS:MINER virus, it is important that you track the utilization of your CPU and GPU. But, since these viruses are complicated and pretend to not use a significant ammount of your computer’s resources, you should download third-party software, such as CoreTemp and GPUTemp in order to check the actual temperature and usage of your PC’s components, required for mining to take place. If you detect an elevated temperature and usage, reccomendations are to remove JS:MINER from your computer by following the removal instructions down below. They are created in order to help remove JS:MINER either manually or automatically. Furthermore, experts also strongly advise to use an advanced anti-malware software in order to remove JS:MINER, since this will make sure that not only the virus is fully removed but your computer will stay protected against future threats as well.

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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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Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

How to Remove JS:MINER from Windows.


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

OFFER

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 JS:MINER 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 JS:MINER 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 JS:MINER 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.

IMPORTANT!
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 JS:MINER 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.

SpyHunter5-update-2018


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

SpyHunter5-Free-Scan-2018


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.

SpyHunter-5-Free-Scan-Next-2018

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


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Get rid of JS:MINER from Mac OS X.


Step 1: Uninstall JS:MINER and remove related files and objects

OFFER
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 JS:MINER:

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 JS:MINER. 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 JS:MINER. 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 JS:MINER 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 JS:MINER. 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
/Library/LaunchDaemons

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


Step 2: Scan for and remove malware from your Mac

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



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


Remove JS:MINER 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


Erase JS:MINER 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


Uninstall JS:MINER 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


Remove JS:MINER 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.

stf-safari-extensions


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 JS:MINER 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


Eliminate JS:MINER 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.


1 Comment

  1. AvatarNiccolò

    Anche dopoaver formattato ho JC:Miner-AV mi pare e non riesco a toglierlo, potrebbe essere nella rete wifi?

    Reply

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