Computer slowing down? It might have been hijacked to mine cryptocurrency

Security News ThreatsCybercrime Uncategorized

IT security company Fortinet says its researchers have been discovering “more and more” incidents of hackers hijacking Web browsers to secretly mine Monero cryptocurrency.

A copy of bitcoin standing on PC motherboard is seen in this illustration picture, October 26, 2017. Picture taken October 26, 2017. REUTERS/Dado Ruvic

SINGAPORE: If you sense that your computer may be acutely slowing down, take note and check if it has been hijacked to secretly mine for a cryptocurrency known as Monero, IT security company Fortinet warned. 

In an advisory issued on Wednesday (Nov 8), Fortinet said its FortiGuard Labs researchers have been discovering “more and more” incidents of cybercriminals carrying out browser cryptojacking.

This essentially means hackers would load a JavaScript into the Web browser when you visit certain compromised sites, which would then result in their computer power being hijacked to mine Monero cryptocurrency, it explained. 

“The more time users spend on the Web pages, the more CPU cycles can be consumed,” Fortinet said. “This explains why hackers typically pick illicit video streaming Web sites, where people stay for hours watching movies or TV serials, to plant such scripts.”

Browser cryptojacking started last September when this method to mine cryptocurrency within Web browsers surfaced, it said. 

The company also said rough calculations by security researchers show that cryptojacking can be lucrative. For instance, hackers targeting popular illicit sites like The Pirate Bay can earn up to US$12,000 per month. 

To see if one’s computer has been hijacked, Fortinet said users should check their CPU usage and identify the application hogging the computing resources. They can then end the application and restart the Web browser. 

Additionally, to prevent further cryptojacking, the company suggested users to install anti-adware Web browser extensions, as well as Web filtering and antivirus tools on their computer. They can also refrain from visiting illicit sites, it added.