Just got done helping a neighbor. Her mouse was spinning and the system was slow. Looked in task manager and saw an iexplore process which had been spawned via a script to run hidden. Basically it was mining crypto currency in the background. Resolving it was simply a matter of closing the process, but something to be on the look out.
Some reading on these crypto browser scripts
Cryptocurrency Miners hidden in websites now run even after users close the browser
Some reading on these crypto browser scripts
Cryptocurrency Miners hidden in websites now run even after users close the browser