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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 has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild
Threat actors engaging in phishing attacks are exploiting routing scenarios and misconfigured spoof protections to impersonate organizations' domains and distribute emails that appear as if they have been sent internally
The "Direct Send" feature simplifies internal message delivery for trusted systems, and the campaign successfully duped both Microsoft Defender and third-party secure email gateways.
Attackers can spoof millions of email addresses to create targeted phishing attacks using flaws in Microsoft, GTX, and Cisco Secure Email Gateway servers.