The worth of digital currencies reached staggering heights in 2017, so corporations and criminals alike are determining methods to generate digital cash with out having to entrance the price of computer systems or electrical energy themselves. The answer: code that’s sneakily hidden on net pages to hijack your laptop computer or telephone’s computing energy.

This yr alone, The Pirate Bay (a infamous file sharing web site), Showtime, and even an Argentine web supplier all served clients code that generated digital currencies (referred to as “mining”) utilizing their machines with out their information or consent. A brand new report from data safety agency Symantec signifies that this development isn’t about to decelerate—fairly the other. If something, it’s about to get an entire lot worse. The firm calls it a looming “arms race” between hackers and safety corporations.

“We anticipate that we’ll see increasingly of them making an attempt to infiltrate advert networks, that are included in lots of web sites,” stated Candid Wueest, principal risk researcher for Symantec, over the telephone.

Read More: 20 Percent of Mobile Cryptocurrency Malware Attacks Are In the US

Cryptocurrency-mining malware was a menace within the early days of Bitcoin, when that digital forex may nonetheless be generated with shopper . This hasn’t been doable for a while now, and so cryptocurrency malware just about died out after 2014. But latest years have seen a large inflow of recent cash like Monero, Zcash, and Ethereum, all of which might be profitably mined with that most individuals have already got.

At the identical time, a number of companies that permit web site house owners (or hackers with entry) to plant miner code on webpages have popped up. The hottest service is named Coinhive, however there are others, notably JSEcoin and Crypto-Loot.

Basically, it’s an ideal storm, and due to this, cryptocurrency malware mining has come again with a vengeance in 2017. There’ve even been some notable tech improvements, like “pop below” home windows that maintain mining after you’ve closed the principle browser window, and botnets that hijack Internet of Things gadgets.

“Defacing a web site is enjoyable for some individuals, nevertheless it’s not worthwhile—that is, and so we predict it can improve,” Wueest stated. It’s nonetheless extra worthwhile for hackers to focus on high-value targets like cryptocurrency exchanges, Wueest continued, however that might change.

“With the worth of cryptocurrencies rising, [malware] may develop into extra worthwhile and develop,” Wueest defined. “And fairly frankly, it doesn’t value a lot—there’s so many content material administration instruments like WordPress which are susceptible.”

The vital factor to remember is that there’s nothing inherently improper with cryptocurrency mining scripts. If you wish to mine some Monero as an alternative of watching an advert, hey, that’s your proper. The drawback is when a web site or app instructions your pc to do one thing that you just didn’t approve or learn about.

Symantec needed to “fine-tune” a few of its safety instruments in September to dam malicious cryptocurrency miners, Wueest stated. There are free methods to guard your self too: You can add mining scripts to Adblock Plus’s block record, and there’s even an open supply script blocker on GitHub referred to as No Coin.

And keep in mind, should you discover your pc all of a sudden slowing down it may not be an indication that your machine is heading to an early grave. It may simply be producing digital cash for another person.

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