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Phishers abuse Google OAuth to spoof Google in DKIM replay attack


Jasper_The_Rasper
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April 20, 2025 By Ionut Ilascu

 

Weakness in Google's systems allows sending DKIM-valid fake emails

In a rather clever attack, hackers leveraged a weakness that allowed them to send a fake email that seemed delivered from Google’s systems, passing all verifications but pointing to a fraudulent page that collected logins.

The attacker leveraged Google’s infrastructure to trick recipients into accessing a legitimate-looking “support portal” that asks for Google account credentials.

The fraudulent message appeared to come from “no-reply@google.com” and passed the DomainKeys Identified Mail (DKIM) authentication method but the real sender was different.

 

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