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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.
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
A newly discovered botnet of 13,000 MikroTik devices uses a misconfiguration in domain name server records to bypass email protections and deliver malware by spoofing roughly 20,000 web domains. [...]
An unknown threat actor has been linked to a massive scam campaign that exploited an email routing misconfiguration in email security vendor Proofpoint's defenses to send millions of messages spoofing various popular companies like Best Buy, IBM, Nike, and Walt Disney, among others