FlagThis — Daily Cybersecurity Intelligence Briefing

The Warlock ransomware group is conducting targeted campaigns against critical infrastructure sectors, including energy, water, and healthcare, by exploiting unpatched Microsoft SharePoint vulnerabilities. Attackers utilize CVE-2023-29357 for unauthenticated remote code execution (RCE) and CVE-2022-24521 for privilege escalation. Following initial access, the threat actor deploys webshells for persistence and utilizes living-off-the-land binaries like certutil and bitsadmin for lateral movement. The campaign employs AES-256 and RSA-4096 hybrid encryption coupled with double extortion via data exfiltration to leak sites. Immediate application of SharePoint Cumulative Updates is required to mitigate these high-impact exploitation vectors.