This article has been created in order to help explain what is JS/CoinMiner.F malware and how to remove it fully from your computer system.
New variant of the JS/CoinMiner malware has been detected to infect computer via malicious websites which have it embedded. The detection is JS/CoinMiner.F and is a variant of the Coin Miner malware. Such viruses utilize the CPU and GPU resources of an infected system in order to generate cryptocurrency tokens from the likes of Monero and BitCoin and all of this is at the expense of the victim. In the even that you have detected the JS/CoinMiner malware, we advise you to immediately remove it, preferrably by following the removal instructions below.
Threat Summary
| Name | JS/CoinMiner.F |
| Type | JavaScript Miner Malware |
| Short Description | When this malware infects your computer, it may begin to use your central processor and video card’s resources in order to mine for the cryptocurrencies BitCoin or Monero. |
| Symptoms | No symptoms besides your CPU and GPU becoming overheated, as this malware tries to stay undetectable for longer periods of time. |
| Distribution Method | Via compromised websites or sites that embedded it. |
| Detection Tool |
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User Experience | Join Our Forum to Discuss JS/CoinMiner.F. |
JS/CoinMiner.F – How Did I Get It
The JS/CoinMiner viruses are replicated via more than one method, but one thing is clear – JavaScript attack is imminent. Such malicious JavaScript malware family is not spread via just one method. The viruses are replicated via more than one method, but one thing is clear – JavaScript attack is imminent. Such malicious JavaScript code is used in order to perform a malicious infection via websites that have it embedded in their code. When you visit the website, the code is automatically activated and after this, the malware begins to mine for the cryptocurrency at the expense of your computer’s resources. Such websites, have so far been detected to be primarily dubious sites of suspicious nature, copycat sites of legitimate ones and even torrent websites, like KickassTorrents and ThePirateBay. And since tradition browsers and OS antivirus cannot ensure perfect protection if you have JavaScript enabled on them, the only viable solution so far appears to be an advanced anti-malware software, which uses real-time shield against threats, like JS/CoinMiner.F variant.
JS/CoinMiner.F – Further Information
The JS/CoinMiner malware is the type of threat that may act file-less after it infects your computer. Since it’s primary purpose is to infect your computer automatically, the miner malware may begin to be active immediately after infection. What happens is that the JavaScript code may or may not drop and execute an automated process on your computer as an administrator, which happens without your consent. This process begins running in the background of your computer system and the only method to detect it is if you see elevated CPU or GPU usage and elevated temperatures. Physically, this can be noticed if your system cooling ventilator becomes active and begins to make a lot of noise.
Once active, the script of this miner malware is often configured to connect to a so-called mining pool, whose primary purpose is to make it so that a lot of infected computers by JS/CoinMiner.F which are connected to the same mining wallet of the hackers generate income for it. This results In many negative consequences for your computer, including:
- Slowing down.
- Freezing at times.
- The breakdown of some of it’s components.
In addition to this, since the JS/CoinMiner.F infection is from the type that performs various different malicious activities, like any other malware would do, it may collect different information from your PC as well, such as:
- Info on any BitCoin wallets.
- Your passwords and online accounts.
- Your system information.
- Your network data.
- Take screenshots from your PC.
- Log your keystrokes.
Even thought it has not yet been confirmed, the malware may also have additional script which may help it install other viruses on your computer and allow it to self-update and stay concealed for longer periods of time, even after you believe you have gotten rid of it.
How to Remove JS/CoinMiner.F from Your PC
In order to fully get rid of this unwanted infection from your computer, you should focus on isolating the threat before performing the actual removal. Since manually removing the threat is a time-costly process, we have made several simple instructions below which can help you isolate and delete the JS/CoinMiner threat from your computer effectively.
Malware researchers and cyber security experts often advise to perform an anti-malware scan using advanced malware removal software in order to permanently remove JS/CoinMiner from it plus discover other malware if it is present on your PC and remove all of the malicious objects in it effectively as well as protect your PC 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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Preparation before removing JS/CoinMiner.F.
Before starting the actual removal process, we recommend that you do the following preparation steps.
- Make sure you have these instructions always open and in front of your eyes.
- Do a backup of all of your files, even if they could be damaged. You should back up your data with a cloud backup solution and insure your files against any type of loss, even from the most severe threats.
- Be patient as this could take a while.
- Scan for Malware
- Fix Registries
- Remove Virus Files
Step 1: Scan for JS/CoinMiner.F with SpyHunter Anti-Malware Tool
Step 2: Clean any registries, created by JS/CoinMiner.F 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/CoinMiner.F there. This can happen by following the steps underneath:
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.Step 3: Find virus files created by JS/CoinMiner.F on your PC.
1.For Windows 8, 8.1 and 10.
For Newer Windows Operating Systems
1: On your keyboard press + R and write explorer.exe in the Run text box and then click on the Ok button.
2: Click on your PC from the quick access bar. This is usually an icon with a monitor and its name is either “My Computer”, “My PC” or “This PC” or whatever you have named it.
3: Navigate to the search box in the top-right of your PC's screen and type “fileextension:” and after which type the file extension. If you are looking for malicious executables, an example may be "fileextension:exe". After doing that, leave a space and type the file name you believe the malware has created. Here is how it may appear if your file has been found:
N.B. We recommend to wait for the green loading bar in the navigation box to fill up in case the PC is looking for the file and hasn't found it yet.
2.For Windows XP, Vista, and 7.
For Older Windows Operating Systems
In older Windows OS's the conventional approach should be the effective one:
1: Click on the Start Menu icon (usually on your bottom-left) and then choose the Search preference.
2: After the search window appears, choose More Advanced Options from the search assistant box. Another way is by clicking on All Files and Folders.
3: After that type the name of the file you are looking for and click on the Search button. This might take some time after which results will appear. If you have found the malicious file, you may copy or open its location by right-clicking on it.
Now you should be able to discover any file on Windows as long as it is on your hard drive and is not concealed via special software.
JS/CoinMiner.F FAQ
What Does JS/CoinMiner.F Trojan Do?
The JS/CoinMiner.F Trojan is a malicious computer program designed to disrupt, damage, or gain unauthorized access to a computer system.
It can be used to steal sensitive data, gain control over a system, or launch other malicious activities.
Can Trojans Steal Passwords?
Yes, Trojans, like JS/CoinMiner.F, can steal passwords. These malicious programs are designed to gain access to a user's computer, spy on victims and steal sensitive information such as banking details and passwords.
Can JS/CoinMiner.F Trojan Hide Itself?
Yes, it can. A Trojan can use various techniques to mask itself, including rootkits, encryption, and obfuscation, to hide from security scanners and evade detection.
Can a Trojan be Removed by Factory Reset?
Yes, a Trojan can be removed by factory resetting your device. This is because it will restore the device to its original state, eliminating any malicious software that may have been installed. Bear in mind, that there are more sophisticated Trojans, that leave backdoors and reinfect even after factory reset.
Can JS/CoinMiner.F Trojan Infect WiFi?
Yes, it is possible for a Trojan to infect WiFi networks. When a user connects to the infected network, the Trojan can spread to other connected devices and can access sensitive information on the network.
Can Trojans Be Deleted?
Yes, Trojans can be deleted. This is typically done by running a powerful anti-virus or anti-malware program that is designed to detect and remove malicious files. In some cases, manual deletion of the Trojan may also be necessary.
Can Trojans Steal Files?
Yes, Trojans can steal files if they are installed on a computer. This is done by allowing the malware author or user to gain access to the computer and then steal the files stored on it.
Which Anti-Malware Can Remove Trojans?
Anti-malware programs such as SpyHunter are capable of scanning for and removing Trojans from your computer. It is important to keep your anti-malware up to date and regularly scan your system for any malicious software.
Can Trojans Infect USB?
Yes, Trojans can infect USB devices. USB Trojans typically spread through malicious files downloaded from the internet or shared via email, allowing the hacker to gain access to a user's confidential data.
About the JS/CoinMiner.F Research
The content we publish on SensorsTechForum.com, this JS/CoinMiner.F how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific trojan problem.
How did we conduct the research on JS/CoinMiner.F?
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 trojans (backdoor, downloader, infostealer, ransom, etc.)
Furthermore, the research behind the JS/CoinMiner.F threat is backed with VirusTotal.
To better understand the threat posed by trojans, please refer to the following articles which provide knowledgeable details.