A phishing scheme discovered by Abnormal Security involved an email impersonating a vendor to bypass the victim's Proofpoint gateway and set up a trap to steal Office 365 credentials. (Microsoft)

Researchers at Abnormal Security said Monday they blocked an attack where a malicious email impersonating one of their customer’s vendors bypassed the customer’s Proofpoint gateway and set up a trap to steal Office 365 credentials.

The researchers said in a blog that if the email had gone through and the recipient fell for the attack, their credentials would be compromised, opening up their account and any data it contains to a possible breach.

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