alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sea Turtle APT Checkin"; http.method; content:"GET"; http.uri; content:"/sy.php"; fast_pattern; endswith; reference:url,huntandhackett.com/blog/turkish-espionage-campaigns; classtype:trojan-activity; sid:2049974; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_01_10, deployment Perimeter, malware_family SeaTurtle, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_10, reviewed_at 2024_10_15;)