One week after the initial WannaCry ransomware attack, the focus of the cybersecurity world has begun to shift to a new threat.

Adylkuzz malware has quietly crept into the fray, with an atypical M.O. when it comes to malare. Instead of type of notice or alert, Adylkuzz is much more discreet. It installs what is referred to as a miner on the victim’s machine which generates the cryptocurrency Monero.

According to researchers, Adylkuzz began infecting machines on May 2, and has spread to over 150,000 machines. Adylkuzz has flown under the radar because it isn’t as aggressive or disruptive because it doesn’t encrypt your data. However, it is far from benign, and it can slow down machines, eventually causing performance issues.

Similar to WannaCry, Adylkuzz only infects older and unpatched Windows PCs, so it can be avoided by installing the most current security patch.