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SuperMailer, a legitimate email newsletter program, has been found abused by threat actors to conduct a high-volume credential harvesting campaign, according to network security firm Cofense.

“The SuperMailer-generated emails have been reaching inboxes at an increasingly remarkable volume,” Brah Haas, cyber threat intelligence analyst at Cofense, said in a blog post. “Emails containing the unique SuperMailer string barely registered in January and February, but in the first half of May they accounted for over 5% of credential phishing emails.”

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