Security researchers have acquired an enormous list of compromised email servers from the perpetrators of the mass Microsoft Exchange compromises. The victim list contains 86,000 IP addresses of Exchange servers infected worldwide. The list is now being used to power a web-based service that can help organizations identify if their email systems were infected in the first wave of attacks. The site aims to solve a problem with mass compromises commonly encountered by researchers: A vast group doesn’t know if they’re infected, and it’s difficult to let those that are affected know.”]
Source: https://www.cuinfosecurity.com/list-hacked-exchange-servers-may-boost-recovery-efforts-a-16151