Security Issues in the Korean & Global Financial Sector in July 2026

This July 2026 intelligence brief summarizes observed security issues in the Korean and global financial sectors: rising phishing-driven multi-stage attack chains (phishing → droppers/loaders → backdoors → infostealers), common malicious attachment types and file extensions, credential exfiltration to Telegram, multiple alleged database breaches and stolen financial/customer data posted for sale by criminal and ransomware groups, and hacktivist DDoS campaigns targeting regional banks; many claims are reported from dark web posts and are not independently confirmed.