level: business
hackers increasingly use ai to craft personalized spear phishing emails at scale, gathering details about coworkers, projects, and travel to make messages seem authentic. existing rule-based security systems relying on if-then logic are too slow and limited to catch these ai-generated attacks. aegisai, founded by former google security executives cy khormaee and ryan luo, developed ai agents that analyze each message like a human would, spotting subtle anomalies that checklists miss.
the startup's technology has been adopted by dozens of customers, including crypto payments company mesh, ai startup langchain, and privacy compliance platform lokker. aegisai recently closed a $36 million series a led by battery ventures, with participation from accel and foundation capital, bringing total funding to $49 million. the company claims its agents can detect threats traditional systems miss, such as malicious pdf attachments with built-in passwords and captcha designed to fool spam filters.
aegisai competes with other ai-driven email security startups like ocean, as well as established vendors proofpoint, mimecast, and abnormal security. however, investor dharmesh thakker of battery ventures believes the founders' experience securing gmail gives aegisai an edge. while starting with email, the company plans to expand into other defense areas like data security, aiming to build customized agents that can investigate and respond to threats.
why it matters: ai-powered phishing attacks bypass traditional defenses over half the time, making ai-driven detection critical for protecting organizations from increasingly personalized and effective email threats.