How to remove the Epsilon miner?

Also Known As: Epsilon browser-based miner
Type: Trojan
Distribution: Low
Damage level: Severe

Epsilon miner removal guide

What is Epsilon?

Epsilon is the name of a software that is designed to perform a browser-based mining - to mine cryptocurrency inside a browser. If a web browser is consuming more of the computer's resources than it should, then it is possible that it has an app like Epsilon installed on it (or the operating system). Research shows that this particular browser crypto-miner is for sale on hacker forums for $50.

epsilon miner for sale on hacker forums

The main difference between browser-based mining and file-based cryptocurrency mining is that in the first case cryptocurrency is mined through an extension that is installed on a browser, and in the second case it is mined through some software that is installed on the operating system. In both cases cryptocurrency mining process makes use of the user's computer resources (like CPU and/or GPU). Cryptocurrency is mined by solving mathematical problems and, the more powerful the hardware is, the faster it can mine cryptocurrency.

Usually the mining process increases CPU and/or GPU usage, therefore, computers that are used to mine cryptocurrency operate slower or even do not respond at all. It means that the operating system may start crashing, stop responding, which can result in loss of unsaved data loss, unexpected shutdowns, hardware overheat, etc., which can result in loss of unsaved data, unexpected shutdowns, hardware overheat, etc. Also, computers that mine cryptocurrency consume more electricity, which means their users receive higher electricity bills. Either way, if some cryptocurrency miner is installed on a browser or the operating system and it was not installed intentionally, then it should be removed as soon as possible.

Threat Summary:
Name Epsilon browser-based miner
Threat Type Cryptocurrency miner.
Detection Names (Epsilon's installer) Avast (Win32:Trojan-gen), BitDefender (Gen:Variant.MSILHeracles.6785), ESET-NOD32 (MSIL/Agent.UEI), Kaspersky (HEUR:Trojan.MSIL.Agent.gen), Microsoft (Trojan:MSIL/CryptInject!MTB), Full List (VirusTotal)
Price $50 (on hacker forums)
Symptoms Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
Malware Removal (Windows)

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Some more examples of a cryptocurrency miners are Cliptomaner, QuilMiner and KingMiner. There are many legitimate miners, however, even those can be misused by cyber criminals for malicious purposes. Their main purpose is to trick users into installing a miner so they could generate revenue at their expense (by using hardware of their computers to mince cryptocurrency).

How did Epsilon infiltrate my computer?

It is unknown how exactly cyber criminals distribute Epsilon, however, it is very likely that they promote this miner on some shady website by disguising as legitimate, useful application. It is worthwhile to mention that in some cases cyber criminals exploit official pages (e.g., Chrome Store) to distribute their third party software. In some cases they attempt to trick users into installing JavaScript-based extensions that contain malicious code that can download even more malware to a user's computer.

Also, it could be distributed via malspam emails (via malicious attachments or download links for malicious files), other unreliable download sources (like Peer-to-Peer networks, third party installers), Trojans, fake software updating or activation tools.

How to avoid installation of malware?

Software should not be downloaded (or installed) through third party downloaders, installers, unofficial pages, etc. It should be done by using official websites and direct links. Irrelevant emails that contain attachments, web links and are received from unknown, suspicious addresses should should not be trusted. Installed programs have to be activated and/or updated by using tools that are provided by official software developers. It is never really safe to use third party, unofficial tools for that. Moreover, it is not even legal to activate licensed software with unofficial tools, or use installers for pirated software. And lastly, the operating system is safer when users scan it for threats regularly and they use a reputable antivirus or anti-spyware suite for that. If you believe that your computer is already infected, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Epsilon's installer detected as a threat on Virustotal:

epsilon miner installer detections list on virustotal

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Combo Cleaner Antivirus for Windows. If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":


manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract autoruns.zip and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software.

To be sure your computer is free of malware infections, we recommend scanning it with Combo Cleaner Antivirus for Windows.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Epsilon browser-based miner QR code
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