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“Ghost-Sender" is the result of a widespread misconfiguration, according to researchers, and evidence indicates it's being actively abused in the wild.
Microsoft said that Office 365 tenants with weak configurations and who don't have strict anti-spoofing protection enabled are especially vulnerable.
The creators of the toolkit are advertising it as an educational and ethical resource, but what it promises to provide users if purchased indicates it's anything but.
The tech giant is boosting Entra ID and MSA security as part of the wide-ranging Secure Future Initiative (SFI) that the company launched following a Chinese APT's breach of its Exchange Online environment in 2023.
The new Secure Alternative Program from Google aims to entice customers away from Exchange Online and break Microsoft's dominance in enterprise.
The massive phishing campaign does not exploit a vulnerability in MFA. Instead, it spoofs an Office 365 authentication page to steal credentials.