Threat Actors Targeting Microsoft SQL Servers to Deploy FreeWorld Ransomware
Threat actors are exploiting poorly secured Microsoft SQL (MS SQL) servers to deliver Cobalt Strike and a ransomware strain called FreeWorld. Cybersecurity firm Securonix, which has dubbed the campaign DB#JAMMER , said it stands out for the way the toolset and infrastructure is employed. "Some of these tools include enumeration software, RAT payloads, exploitation and credential stealing software, and finally ransomware payloads," security researchers Den Iuzvyk, Tim Peck, and Oleg Kolesnikov said in a technical breakdown of the activity. "The ransomware payload of choice appears to be a newer variant of Mimic ransomware called FreeWorld." Initial access to the victim host is achieved by brute-forcing the MS SQL server, using it to enumerate the database and leveraging the xp_cmdshell configuration option to run shell commands and conduct reconnaissance. The next stage entails taking steps to impair system firewall and establish persistence by c...