Secure agentic AI for your Frontier Transformation

Microsoft Security Blog round-up (Feb–Mar 2026): multiple high-impact threat trends and defensive guidance. Key items include: securing agentic AI and frontier AI deployments; threat actors operationalizing AI (notably North Korean groups Jasper Sleet/Coral Sleet) to scale tradecraft; malicious browser extensions harvesting LLM chat histories and browsing data with ~900,000 installs impacting >20,000 enterprise tenants; Tycoon2FA AiTM phishing-as-a-service operating at scale (affecting hundreds of thousands of organizations) and subsequent disruption efforts; signed malware using a stolen EV (