Threat hunters say they’ve seen a concerted rise in the use of a phishing tactic designed to bypass traditional email defenses by subtly changing the prefixes (a.k.a. schemes) of malicious URLs in hyperlinks.
In other words, rather than a URL beginning with “http://” it instead starts with “http:/\”. Yet the rest of the URL remains the same. “The URLs don’t fit the ‘known bad’ profiles developed by simple email scanning programs, allowing them to slip through undetected,” explains a blog post today from the GreatHorn Threat Intelligence Team.
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