Security researchers at Inky recently discovered a rash of fraudulent emails that bypass certain conventional spam filters by using image attachments and QR codes. The scams don't appear to have a specific target but all attempt to steal employee credentials.
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https://www.techspot.com/news/99265-cybercriminals-circumventing-email-security-image-based-scams.html?utm_source=dlvr.it&utm_medium=blogger