alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Telegram Auth Cookie (stel_ssid)"; flow:established,to_client; http.stat_code; content:"200"; http.cookie; content:"stel_ssid="; fast_pattern; classtype:misc-activity; sid:2071581; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_18, deployment Perimeter, confidence High, signature_severity Informational, tag Telegram, updated_at 2026_08_18;)