Blackhatsec

‛Fog’ Ransomware Rolls in to Target many Sectors. A new group of hackers is encrypting data in virtual machines, leaving ransom notes, and calling it a day. A new ransomware operation has been performing old-fashioned ransomware attacks, locking up data in virtual environments to earn quick payouts. Attack Vectors • Fog attacks typically begin with stolen virtual private network (VPN) credentials, an increasingly popular means of initial access into sizable organizations. The group has exploited two different VPN gateway vendors thus far, which Arctic Wolf has declined to name. • In one case, for example, Fog passed the hash to compromise administrator accounts in its target’s network. It then used the accounts to establish a remote desktop protocol (RDP) connection with Windows servers running the Hyper-V hypervisor and Veeam data protection software. • Other common Fog tactics, techniques, and procedures (TTPs) include credential stuffing, using native Windows and open-source tools l...