From Forgotten Tool to Powerful Pivot: Using JA3 to Expose Attackers’ Infrastructure  

A growing skepticism around JA3 is evident, and quite understandable as well. Public lists are rarely updated, and initiatives like JA3-fingerprints have been effectively frozen since 2021, creating the impression that this is a “yesterday’s technology.”  However, JA3 fingerprints have not disappeared. Sensors continue to collect them, they appear in reports and threat intelligence interfaces; it’s just that many teams treat them formally, as yet
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