In this comprehensive eBook, we describe how hackers and cryptocurrencies are impacting website security. As cryptocurrencies gain market capitalization, many cybercriminals are looking for opportunities to monetize on the growing popularity. Sucuri researchers have identified a variety of malware campaigns devised to infect websites and hijack valuable resources to mine cryptocurrencies. This content is intended to educate and bring awareness to the threat of cryptomining malware. Topics include cryptocurrencies, cryptominers, types of related malware infections, trends and threat predictions for 2018, and information on how administrators can mitigate the risk of a infection and protect their websites.