alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Possible Fake Edu Host with __test Cookie"; flow:established,to_server; http.method; content:"GET"; http.host; content:"edu"; pcre:"/(?!\.[a-z]{2}$|$)/R"; http.cookie; content:"__test="; fast_pattern; depth:7; classtype:misc-activity; sid:2035555; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_21, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_21, reviewed_at 2024_10_15;)