Building 92 at Microsoft Corporation headquarters in Redmond, Washington. (Coolcaesar, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons)

An email security company says its researchers observed a spear phishing campaign that exactly spoofed a Microsoft email domain to trick Office 365 users. This suggests Microsoft’s servers were not enforcing protective DMARC authentication protocols when communications were received – and perhaps still are not.

The campaign, according to a blog post published by the company Ironscales, uses a lure that suggests the recipient has important email messages that have been quarantined, and must click a link to salvage them. The phishing email reportedly alludes to a hosted email security feature that Microsoft introduced last September as a way to salvage emails that are wrongly labeled as spam, or phishes by the company’s Exchange Online Protection filtering service. 

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