A new new ransomware has been discovered called MegaCortex that is targeting corporate networks and the workstations on them. Not much is currently known about its encryption algorithms, exactly how attackers are gaining access to a network, and whether ransom payments are being honored. The attacks originate from a compromised domain controller, Sophos has said. The ransom note contains information explaining what happened and emails addresses that can be used to contact the attackers. It may suggest that the attackers are paying Trojan operators for access to infected systems in a similar manner as Ryuk.
Source: https://www.bleepingcomputer.com/news/security/new-megacortex-ransomware-found-targeting-business-networks/