Ray Shultz at MediaPost's EmailINSIDER wrote about a nasty new way that the bad guys are trying to establish trust: spoofing the return path and received email headers of Barracuda in an attempt to steal O365 credentials. Email security firm GreatHorn had the scoop on this attack.
So how did it happen?
“The attackers crafted the received headers so that it appears to have gone through multiple 'Barracuda' steps, before sending the email via a server designed to look like a Barracuda server." Among the phishing emails sent in this case was one purportedly coming from “Email Quarantine.” It included the message-id: noreply.barracudanetworks.com
GreatHorn continued: "The attack “exploits a well-known security flaw in Google and Microsoft’s handling of authentication frameworks such as DMARC. While an organization can dictate how it wants DMARC failures and exceptions to be handled, Microsoft Office 365 typically ignores those directives and, at best, treats them as spam or junk instead of quarantining or rejecting them, making it more likely for the user to interact with such spoofs.”
You could easily see this replicated with another security company
GreatHorn says it discovered the attack last Thursday, then found a subset on Friday. The firm concludes: “While the spoofing victim in this case was Barracuda, you could easily see this strategy replicated using any other well-known security company to try and trick more savvy users.”
Yikes. Could be Symantec, McAfee, or KnowBe4. Keep your security awareness level set at HIGH!
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