alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TickGroup Datper CnC Checkin M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/hp.php?"; depth:8; fast_pattern; pcre:"/^[a-z]{3,10}=[a-z0-9]+$/R"; http.accept; content:"*/*"; http.content_type; content:"application/x-www-form-urlencoded"; http.header_names; content:!"Referer"; content:!"Accept-"; reference:url,blogs.jpcert.or.jp/ja/2019/02/tick-activity.html; classtype:command-and-control; sid:2026947; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_02_20, deployment Perimeter, malware_family Datper, performance_impact Low, confidence High, signature_severity Major, tag TickGroup, updated_at 2020_08_27;)