Microsoft 365 Exchange Online Direct Send exploited for internal phishing campaigns

Threat Group: Opportunistic and financially motivated actors targeting multiple sectors Threat Type: Phishing and email infrastructure abuse Exploited Vulnerabilities: Abuse of Microsoft 365 Exchange Online Direct Send feature; implicit trust of unauthenticated internal-looking emails; weak or unenforced SPF, DKIM, and DMARC Malware Used: None required for initial access; follow-on payloads