alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Observed slowAES Library To Generate Cookie Challenge Header"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"slowaes.decrypt("; nocase; fast_pattern; content:"document.cookie"; content:"location.href"; reference:url,blog.kwiatkowski.fr/testcookie; reference:url,github.com/samuraitruong/php-cookie-challenge/blob/36c0547159d06bbcec66dc06b8ac5c13e3afb658/src/cookieChallenge.js; classtype:misc-activity; sid:2068904; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_04_22, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2026_04_22; target:src_ip;)