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Home/Glossary/Whaling
Glossary · Attack Vector

What Is Whaling?

A highly targeted phishing attack aimed at senior executives, C-suite officers, or other high-value individuals within an organization, often involving impersonation of other executives or legal authorities.

Quick Definition

A highly targeted phishing attack aimed at senior executives, C-suite officers, or other high-value individuals within an organization, often involving impersonation of other executives or legal authorities.

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01Whaling explained.

Whaling attacks target the "big fish" — hence the name. These attacks focus on CEOs, CFOs, board members, and other senior leaders who have authority to approve large financial transactions or access the most sensitive organizational data.

Because executives often have less time for security training and are accustomed to urgent, high-stakes requests, they can be particularly vulnerable. The potential payoff for a successful whaling attack is enormous, making it worth the significant research investment.

A single successful whaling attack can result in losses of millions of dollars. The FBI estimates that business email compromise, which often involves whaling, has cost organizations over $50 billion globally.

02How it works.

01Attackers identify high-value targets through public filings, press releases, and social media
02They study the executive's communication style, travel schedule, and business relationships
03A convincing message is sent — often appearing to be from a lawyer, board member, or government agency
04The message typically requests an urgent wire transfer, confidential data, or credential verification
05The executive, trusting the apparent authority, complies before verifying through other channels

03Real-world example.

In 2016, the CEO of an Austrian aerospace company was fired after a whaling attack tricked the finance department into wiring $47 million to attackers. The email appeared to come from the CEO himself, requesting an urgent transfer for a confidential acquisition.

04How to protect yourself.

01Implement mandatory dual-authorization for all financial transfers above a threshold
02Provide dedicated security training for C-suite and senior leaders
03Establish out-of-band verification procedures for any unusual financial request
04Use email authentication protocols to prevent domain spoofing
05Encourage a culture where questioning unusual requests — even from the CEO — is expected
Related Terms
Spear PhishingBusiness Email Compromise (BEC)Social EngineeringPretexting
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