Application.BitCoinMiner is a program that uses the computer's physical resources (memory, processing power, etc) to generate units of a virtual or digital cryptocurrency.
Based on the settings of your F-Secure security product, it will either prompt you for a desired action, allow the program to run, block access to the program but leave it in place, or move it to the quarantine where it cannot harm your device.
If you are confident that you are aware of the risks involved in using the program and consent to its use, you may choose to allow the program to run. You can also change the settings of the F-Secure security product to exclude it from further scanning. Note: you need administrative rights to change the settings.
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A cryptocurrency is an anonymous, decentralized form of digital currency, which can be used online as a medium of exchange much like traditional, physical currencies. Multiple cryptocurrencies exist, such as BitCoin, Ethereum and Monero.
The 'crypto' part of the term refers to the use of cryptography both for creating the currency units and for securing transactions made with the units. Because of the anonymity provided by cryptocurrency, its legality and acceptance varies considerably between countries.
Cryptocurrency units can be created by any user with specialized mining programs or miners that run the mathematical calculations needed to generate a unit of a particular cryptocurrency.
Because the calculations are complex, many enthusiasts will build computers with specialized hardware and software to handle the work. Some websites also support cloud mining, where users visiting the site essentially allow temporary use of their computer's processing power to perform part of the calculating work, usually in exchange for a service offered by the site.
Some malware include miners as part of their payload; in such cases, the malware is hijacking a user's computer to create cryptocurrency units for the malware author's benefit.