Actually there are some software for mining that has a virus in which it will detect by your antivirus and you must need to turn off your anti virus in order to start the software but it is risky because your computer may have the virus that the anti virus has been detect so it would be better if you will ask first some friends on what they in order to install safely their mining software and what terms of agreement they have sign into.

step 0 is prevention:
- never download or install shady binaries that you don't know the source of and don't trust.
- always make sure you have real software by verifying their digital signature if possible
- if you have to run a shady application then use a sandbox so that in case it contained anything malicious it wouldn't infect your computer.
- never visit shady website
- and as the last line of defense if you are on a closed source OS such as Windows or Mac you can install a good anti virus.

if you are already infected
best solution would be formatting the hard disk and reinstalling the OS but since that is hard you can install a good anti virus or use a rescue disk to scan and try to remove it.
detecting this type of malware is easy since they have to use excessive amount of computing power so the symptoms are obviously increased CPU or GPU usage, hearing the fan sound (if your fan speed is adjusted according to usage),...

How to detect:
1. Check resource allocation using task manager. Identify any unknown program using high resources. It's a manual process.
2. Buy a licensed version of nternet security package which contains anti virus, anti malware/spyware and live internet usage. It's automated and easy. Don't rely on free to download antivirus softwares

How to protect:
1. Check point no 2 above.
2. Don't download random softwares from the web.
3. Strictly don't use any torrent related websites

I think you will do just great if you follow these instructions.

Mining Bitcoins with a PC is absurd.You will get a few cents,if you are mining 365 days 24/7 (if electricity costs are zero).Do you mean the ransomeware virus that blocks your PC and asks to bitcoin payments?
The guys mentioned how to protect yourself in the previous posts,but I can share my personal experience.
I'm using Malwarebytes anti-malware software and I'm scanning my PC every once and a while.
When I'm browsing,I use a handy little software called Sandboxie to protect my PC from spreading the virus  across all system files and libraries.It keeps the malicious files inside a sandbox,so I can delete them later.

I still remember the days where our network had trouble with internet connections. We checked our neighbor's if they had the same problem but it turned out that we were the only ones who were experiencing the problem. Our computers were not able to detect the mining virus. It was just sad to tell that if people with no technical knowledge could encounter these things, they wouldn't notice that someone is actually using their internet and computer without their permission.

The solution for this is to find the root of this scheme. The authorities must find the person or group who operates these kinds of software and take them to jail. As a miner, you should always have virus protection software. Anyway, I have found an interesting online article that relates to How to Detect and Remove the BitCoin Miner Virus, read the content it is knowledgeable to know.

It would surely use more than 70% of your CPU's power and graphic cards power because the virus is taking your computer's resources for themselves this kind of problem is a common issue regarding what does the virus does to your computer, and surely prevention is better than cure but what if it bypasses that prevention most of us are talking about, I think this kind of Virus can be removed by Malwarebytes, you can surely double-check it just to be sure and you can even reset your browser in a default settings as well.

Yeap. Mining is pretty much easily noticeable probably besides rare cases when the hacker uses only like 10% which is unlikely I think. As for such viruses being easily removed through software like Malwarebytes, sure it can. But I'm more of a reinstall-the-OS-instead guy, just to be completely sure.

Also dudes and dudettes, Linux!

The best thing to do is to just update your OS regularly and your windows defender and also include your anti virus for your laptop or computer's safety measures. If you are careful on browsing different sites and downloading different files in the internet you will not be able to have any virus on your laptop or computer so just be careful on accessing different platforms in order to avoid viruses. Just like what I have been said the most and prettiest thing to do is to always keep updated your OS and anti virus.

it could be hard to identify this malware by the resources because when we configure cpuminer (the software for mining used as malware) we can select the % of the CPU to use, so, if the marlware only use 10% of our CPU then we will not see a big change in the system resources.

The best option is to backup and format. But i was thinking we could block some ports in the firewall to avoid the connections to mining pools. I'm not sure if this would really work but at least the hacker will not get a recompense this way.

I'm not sure why no one has mentioned it but:

It's not easy to actually detect mining virus. Unlike the wallet stealing malware which specifically actively looks out for any suspicious programs that seeks for wallet files, a mining virus is much harder to detect in the sense that they can attempt to conceal their activities within a legitimate program. For example, they can spawn a process that uses a high CPU resource and it still wouldn't be that suspicious since many programs has a high CPU utilisation.

It would take a reverse engineering of the program to determine if its a false positive or not.