OTX Threat: Unknown Threat Actor Uses AI-Driven ARTEX to Target South Korean Finance

An unidentified threat actor, likely Chinese-speaking and financially motivated, conducted targeted attacks against South Korean financial institutions between late September and early October 2026, successfully exfiltrating data. The adversary utilized ARTEX, a Chinese-developed open-source agentic penetration testing tool, combined with large language models including DeepSeek v4.1-flash, GLM-5. Sectors: Finance