Investigation into recent attacks by a #Conti affiliate reveals that that the attackers initially accessed targeted organizations' networks with ProxyShell, an exploit of vulnerabilities in #Microsoft Exchange that have been the subject of multiple critical updates over the past several months. #ransomware

https://news.sophos.com/en-us/2021/09/03/conti-affiliates-use-proxyshell-exchange-exploit-in-ransomware-attacks/