alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Possible Snake Header in HTTP Request"; flow:established,to_server; http.header_names; content:"Cockie|0d 0a|"; fast_pattern; reference:url,cisa.gov/news-events/cybersecurity-advisories/aa23-129a; classtype:misc-activity; sid:2045633; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_10, deployment Perimeter, malware_family Snake, performance_impact Significant, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_10;)