Phishing attackers exploit email routing and spoofing gaps
📧 Microsoft Threat Intelligence warns attackers are increasingly abusing complex email routing and misconfigured DMARC and SPF policies to make phishing messages appear internal. Campaigns exploit MX records that do not point directly to Microsoft 365, allowing messages with the recipient's address in both To and From fields to bypass filters. Lures include password resets and shared-document notices, and some attacks use Phishing-as-a-Service platforms such as Tycoon 2FA to perform Adversary-in-the-Middle attacks that can defeat MFA. Microsoft recommends strict DMARC reject policies, SPF hard-fails, correct connector configuration, and phishing-resistant MFA like FIDO2.
