JSMiner-C Virus

Also Known As: JSMiner-C malware
Type: Adware
Distribution: Low
Damage level: Medium

JSMiner-C removal instructions

What is JSMiner-C?

First detected by Avast, JSMiner-C is malware that helps developers to mine cryptocurrency. JSMiner-C is essentially designed to cause redirects to malicious sites that mine Monero cryptocurrency. These sites are not limited to mining cryptocurrency - they also proliferate potentially unwanted adware-type programs (PUPs), deliver intrusive advertisements, and collect various sensitive data.

JSMiner-C adware

As mentioned above, rogue sites mine cryptocurrency. To achieve this, cyber criminals employ JavaScript. To mine Monero cryptocurrency, criminals misuse computer CPU resources - a task for which JavaScript is perfectly suited. Immediately after opening a malicious site, users will experience a significant reduction in system performance. In fact, the computer essentially becomes unusable, since mining cryptocurrency typically takes up to 100% of CPU power. This results in little or no remaining resources for operation of other applications, and continual crashes. Users are unable to properly use the computer, and also receive no revenue - all mined cryptocurrency goes to cyber criminals. Recently, such scam models have became very popular due to the success of cryptocurrencies, the prices of which have increased tens or even hundreds of times during the last year. For instance, Monero's price jumped from ~$22 (May 1st, 2017) to ~$355 (January 1st, 2018). JSMiner-C is not the only malware related to cryptocurrency mining - you can find more information on this topic here. In any case, if you continually encounter pop-ups stating that anti-virus software has detected a JSMiner-C infection, there is a high probability that you will be continually redirected to cryptocurrency-mining websites and your system is infected with various adware.

Malicious sites are likely to proliferate adware-type PUPs. These applications also have identical behavior - they deliver intrusive advertisements and record various data. The websites and PUPs deliver coupon, banner, pop-up, and other deceptive ads. The ads often lead to other malicious sites and run scripts that download and install malware. Therefore, clicking them can result in high-risk computer infections. In addition, ads delivered by PUPs often conceal underlying website content, thereby significantly diminishing the Internet browsing experience. Furthermore, malicious websites and rogue programs gather Internet Protocol (IP) addresses, Internet service providers (ISPs), geographic locations, website URLs visited, queries entered into search engines, keystrokes, and other information that typically includes personal information. The collected data is later sold to third parties (potentially, cyber criminals) who generate revenue by misusing confidential details. Therefore, information tracking can lead to serious privacy issues or even identity theft. If you continually encounter redirects to suspicious websites, observe intrusive advertisements, and experience a reduction in system performance, immediately eliminate all dubious applications/browser plug-ins and scan the system with a legitimate anti-virus/anti-spyware suite.

There are dozens of adware-type applications, all of which are virtually identical (e.g., Best Results, BrowseSuggest, Internet Quick Access, and many others). By offering various useful features, these potentially unwanted programs attempt to give the impression of legitimacy, however, they deliver no real value for regular users. Adware is designed only to generate revenue for the developers. Rather than enabling the functionality promised, it poses a threat to your privacy and Internet browsing safety.

How did JSMiner-C install on my computer?

PUPs are proliferated using intrusive advertisements and a deceptive marketing method called "bundling". Therefore, due to the lack of knowledge and careless behavior of many users, they often infiltrate systems without permission. "Bundling" is stealth installation of third party software together with regular apps. Developers hide "bundled" programs within "Custom/Advanced" options (or other sections) of the download/installation processes. Many users rush these procedures and skip steps. In addition, they click dubious links/advertisements, since they are not aware of the possible consequences. This careless behavior often leads to various computer infections.

How to avoid installation of potentially unwanted applications?

The key to computer safety is caution. Therefore, pay close attention when browsing the Internet and downloading/installing software. Bear in mind that intrusive advertisements look legitimate, however, they are easy to distinguish, since most lead to gambling, adult dating, pornography, and other dubious sites. If you encounter such advertisements, immediately remove all suspicious applications and browser plug-ins. Furthermore, never rush when downloading and installing software. Select "Custom/Advanced" settings, closely analyze each window of the dialogs, and cancel all additionally-included programs. You are advised to download your programs from official sources only, using direct download links. Unofficial downloaders/installers are used to proliferate malware (the "bundling" method) and, therefore, these tools should not be used. Having a legitimate anti-virus/anti-spyware suite installed on your computer is also paramount.

Quick menu:

Adware removal:

Windows 7 users:

Accessing Programs and Features (uninstall) in Windows 7

Click Start (Windows Logo at the bottom left corner of your desktop), choose Control Panel. Locate Programs and click Uninstall a program.

Windows XP users:

Accessing Add or Remove Programs in Windows XP

Click Start, choose Settings and click Control Panel. Locate and click Add or Remove Programs.

Windows 10 and Windows 8 users:

Accessing Programs and Features (uninstall) in Windows 8

Right-click in the lower left corner of the screen, in the Quick Access Menu select Control Panel. In the opened window choose Programs and Features.

Mac OSX users:

Uninstall app in OSX (Mac)

Click Finder, in the opened screen select Applications. Drag the app from the Applications folder to the Trash (located in your Dock), then right click the Trash icon and select Empty Trash.

JSMiner-C adware uninstall via Control Panel

In the uninstall programs window, look for any potentially unwanted programs, select these entries and click "Uninstall" or "Remove".

After uninstalling the potentially unwanted program that causes JSMiner-C redirects, scan your computer for any remaining unwanted components or possible malware infections. To scan your computer, use recommended malware removal software.


Download recommended remover for
JSMiner-C malware

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Remove adware from Internet browsers:

Video showing how to remove potentially unwanted browser add-ons:

Internet Explorer logoRemove malicious add-ons from Internet Explorer:

Removing JSMiner-C ads from Internet Explorer step 1

Click the "gear" icon Internet Explorer options icon (at the top right corner of Internet Explorer), select "Manage Add-ons". Look for any recently-installed suspicious browser extensions, select these entries and click "Remove".

Removing JSMiner-C ads from Internet Explorer step 2

Optional method:

If you continue to have problems with removal of the jsminer-c malware, reset your Internet Explorer settings to default.

Windows XP users: Click Start, click Run, in the opened window type inetcpl.cpl In the opened window click the Advanced tab, then click Reset.

Resetting Internet Explorer settings to default on Windows XP

Windows Vista and Windows 7 users: Click the Windows logo, in the start search box type inetcpl.cpl and click enter. In the opened window click the Advanced tab, then click Reset.

Resetting Internet Explorer settings to default on Windows 7

Windows 8 users: Open Internet Explorer and click the gear icon. Select Internet Options.

Reseting Internet Explorer settings to default in Windows 8 - accessing

In the opened window, select the Advanced tab.

Resetting Internet Explorer settings to default on Windows 8 - Internet options advanced tab

Click the Reset button.

Resetting Internet Explorer settings to default on Windows 8 - click the Reset button in the Internet options advanced tab

Confirm that you wish to reset Internet Explorer settings to default by clicking the Reset button.

Resetting Internet Explorer settings to default on Windows 8 - confirm settings reset to default by clicking the reset button

Google Chrome logoRemove malicious extensions from Google Chrome:

Removing JSMiner-C  ads from Google Chrome step 1

Click the Chrome menu icon Google Chrome menu icon (at the top right corner of Google Chrome), select "More tools" and click "Extensions". Locate all recently-installed suspicious browser add-ons, select these entries and click the trash can icon.

Removing JSMiner-C ads from Google Chrome step 2

Optional method:

If you continue to have problems with removal of the jsminer-c malware, reset your Google Chrome browser settings. Click the Chrome menu icon Google Chrome menu icon (at the top right corner of Google Chrome) and select Settings. Scroll down to the bottom of the screen. Click the Advanced… link.

Google Chrome settings reset step 1

After scrolling to the bottom of the screen, click the Reset (Restore settings to their original defaults) button.

Google Chrome settings reset step 2

In the opened window, confirm that you wish to reset Google Chrome settings to default by clicking the Reset button.

Google Chrome settings reset step 3

Mozilla Firefox logoRemove malicious plug-ins from Mozilla Firefox:

Removing JSMiner-C ads from Mozilla Firefox step 1

Click the Firefox menu firefox menu icon (at the top right corner of the main window), select "Add-ons". Click "Extensions", in the opened window, remove all recently-installed suspicious browser plug-ins.

Removing JSMiner-C ads from Mozilla Firefox step 2

Optional method:

Computer users who have problems with jsminer-c malware removal can reset their Mozilla Firefox settings.

Open Mozilla Firefox, at the top right corner of the main window, click the Firefox menu, firefox menu icon in the opened menu, click Help.

Accessing settings (Reset Firefox to default settings step 1)

Select Troubleshooting Information.

Accessing Troubleshooting Information (Reset Firefox to default settings step 2)

In the opened window, click the Refresh Firefox button.

Clicking on Refresh Firefox button (Reset Firefox to default settings step 3)

In the opened window, confirm that you wish to reset Mozilla Firefox settings to default by clicking the Refresh Firefox button.

Confirm your want to reset Firefox settings to default (Reset Firefox to default settings step 4)

safari browser logoRemove malicious extensions from Safari:

removing adware from safari step 1 - accessing preferences

Make sure your Safari browser is active, click Safari menu, and select Preferences....

removing adware from safari step 2 - removing extensions

In the opened window click Extensions, locate any recently installed suspicious extension, select it and click Uninstall.

Optional method:

Make sure your Safari browser is active and click on Safari menu. From the drop down menu select Clear History and Website Data...

resetting safari step 1

In the opened window select all history and click the Clear History button.

resetting safari step 2

Microsoft Edge logoRemove malicious add-ons from Microsoft Edge:

Removing browser hijackers from Microsoft Edge step 1

Click the three horizontal dots icon edge more icon (at the top right corner of Microsoft Edge), select "Extensions". Look for any recently-installed suspicious extensions, right click your mouse on these entries and click "Uninstall".

Removing browser hijackers from Microsoft Edge step 2

Optional method:

Click the three horizontal dots icon edge more icon (at the top right corner of Microsoft Edge), and select Settings.

Resetting Microsoft Edge settings step 1

In the opened tab, click the "Choose what to clear" button.

Resetting Microsoft Edge settings step 2

Click Show more and select everything, and then click the "Clear" button.

Resetting Microsoft Edge settings step 3

  • If this didn't help, please follow these alternative instructions explaining how to reset Microsoft Edge browser.

Summary:

declining installation of adware while downloading free software sampleCommonly, adware or potentially unwanted applications infiltrate Internet browsers through free software downloads. Note that the safest source for downloading free software is via developers' websites only. To avoid installation of adware, be very attentive when downloading and installing free software. When installing previously-downloaded free programs, choose the custom or advanced installation options – this step will reveal any potentially unwanted applications listed for installation together with your chosen free program.

Removal assistance:
If you are experiencing problems while trying to remove jsminer-c malware from your computer, please ask for assistance in our malware support forum.

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