Warning: Attackers Are Using DKIM Replay Attacks to Bypass Security Filters
Cybercriminals are abusing legitimate invoices and dispute notifications from popular services to send scam emails that bypass security filters, according to researchers at Kaseya’s INKY. The attackers have used this technique to impersonate PayPal, Apple, DocuSign, HelloSign, and others. “These platforms often allow users to enter a ‘seller name’ or add a custom note when creating an invoice or notification,” the researchers write.