Abnormal Security

Abnormal — formerly Abnormal Security, now branded Abnormal AI — is a leading AI-native cybersecurity platform focused on the inbox and cloud. Rather than relying on known-threat signatures, it learns the normal behavior of people and systems in an organization and flags the anomalies, catching sophisticated email attacks — phishing, business email compromise, and account takeover — that slip past traditional defenses.

What is Abnormal Security?

Abnormal (Abnormal AI) is an AI-native security platform that protects email and cloud environments using behavioral AI. Its core insight is behavioral: by modeling the normal communication patterns and behavior of users, vendors, and systems, it detects the subtle anomalies that signal an attack — even novel ones with no known signature. This makes it effective against the hardest email threats, including targeted phishing, business email compromise (where attackers impersonate executives or vendors), and account takeover. It layers onto existing email platforms like Microsoft 365 and Google Workspace, using its AI to catch what native and legacy tools miss, and extends to broader cloud and human-behavior security. Abnormal is used by large enterprises that need protection against increasingly AI-powered attacks, and its pricing is enterprise and quote-based.

What it does well

• Behavioral AI: detects anomalies, not just known-threat signatures.
• Stops advanced attacks: phishing, business email compromise, and account takeover.
• Layered protection: augments Microsoft 365 and Google Workspace.
• Enterprise-grade: built for large organizations facing sophisticated threats.

Who it is for

Abnormal is built for enterprises and their security teams that need to defend against advanced email and cloud attacks — especially the socially engineered threats like business email compromise that bypass traditional filters. It suits organizations already on Microsoft 365 or Google Workspace that want an AI layer to catch what native tools miss. Small businesses with basic needs may rely on built-in protections, but for enterprises facing sophisticated, AI-powered attacks, Abnormal is a leading choice.

Things to keep in mind

• Pricing is enterprise and quote-based — a significant security investment.
• It complements, rather than replaces, your existing email platform.
• The company rebranded from Abnormal Security to Abnormal AI; the platform continues.

Our verdict

Abnormal (now Abnormal AI) is a leading AI-native email and cloud security platform precisely because it takes a behavioral approach: by learning what normal looks like and flagging anomalies, it catches the sophisticated, socially engineered attacks — business email compromise, targeted phishing, account takeover — that signature-based tools miss. As attacks themselves get more AI-powered, that capability is increasingly essential. It is an enterprise, quote-based platform that layers onto Microsoft 365 or Google Workspace rather than replacing them, but for enterprises serious about defending the inbox, Abnormal is an excellent choice.

Frequently asked questions

What is Abnormal Security?

Abnormal (now branded Abnormal AI) is an AI-native email and cloud security platform that uses behavioral AI to detect advanced attacks like phishing, business email compromise, and account takeover.

How does Abnormal detect threats?

It models the normal behavior of users, vendors, and systems, then flags anomalies — catching even novel attacks with no known signature, which signature-based tools miss.

Does Abnormal replace my email provider?

No. Abnormal layers onto existing platforms like Microsoft 365 and Google Workspace, adding an AI security layer that catches what native and legacy tools miss.

How much does Abnormal cost?

Abnormal does not publish pricing; plans are enterprise and quote-based, sized to your organization, so you request a demo for a tailored quote.