Key Findings UNC3753 (Luna Moth, Chatty Spider, Silent Ransom Group) conducted extortion campaign targeting US legal, financial, and professional services firms from January to May 2026 Attack chain relies entirely on social engineering and voice phishing with no malware or ransomware involved Threat actors escalated tactics to include physical office intrusions where operatives pose as IT technicians and insert USB drives to steal data Stolen data typically includes tax reco
