A zero-day credential phishing attack impersonating the U.S. Supreme Court and leveraging the legitimacy of CAPTCHA was recently stopped dead in its tracks.

By using machine learning algorithms, Armorblox foiled the attack aimed at C-suite executives, according to a blog post by company co-founder and architect Chetan Anand.

The attackers were mainly trying to use the fraudulent emails to steal credentials so they could launch other, more destructive attacks. Fortunately in this case, Anand says the attackers were stopped, the bad emails were quarantined and no further damage took place. This attack in the United States has been tougher to detect than other such cases around the world because it avoids known malware and instead opts for a zero-day credential phishing page.

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