Matrix is a ransomware family that was first identified publicly in December 2016. Over the years since its inception, it has primarily targeted small- to medium-sized organizations. As of 2019, it had been observed across geographic locations such as the U.S., Belgium, Taiwan, Singapore, Germany, Brazil, Chile, South Africa, Canada and the UK.
While initially leveraging tactics such as spam email campaigns, propagation via Windows shortcuts and the RIG exploit kit for distribution, the primary attack vector for the Matrix ransomware family shifted in 2018 to brute forcing weak Remote Desktop Protocol (RDP) credentials. The shift to this attack methodology appears to be a recurring trend in similar targeted ransomware families such as Dharma, Ryuk and BitPaymer.
Source: Palo Alto