The use of browsers to mine for digital currency is becoming a major problem. With more and more sites incorporating in-browser mining scripts such as CoinHive and web extensions injecting them into web pages, people will continue to be affected by this attack. Thankfully, we can easily detect miners using the Chrome Task Manager.
Threat actors behind a malvertising campaign are explicitly targeting mobile web users, redirecting Android owners to websites where crooks mine Monero using the Coinhive service while the user is busy solving a CAPTCHA.
Thousands of sites were injected with a in-browser Monero miner today after a popular accessibility script was compromised. With 4, 275 sites affected, this included government websites such as uscourts.gov, ico.org.uk, & manchester.gov.uk.
A Firefox extension called Image Previewer was discovered today that not only displays popups, but also injects a Monero in-browser miner into Firefox. While we have seen numerous Chrome extensions injecting in-browser miners, this is the first time I have seen a Firefox addon with this behavior.
Opera released new versions of their mobile browser today that blocks in-browser cryptocurrency mining as long as the built-in ad blocker is enabled. This feature has already been present in the desktop version of Opera since December and is a welcome addition to their mobile counterparts.