alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BlackTech/PLEAD TSCookie CnC Checkin M1"; flow:established,to_server; threshold:type both, count 1, seconds 30, track by_dst; http.method; content:"GET"; http.uri; content:".aspx"; http.user_agent; content:"Mozilla/4.0 |28|compatible|3b 20|MSIE 8.0|3b 20|Win32|29|"; fast_pattern; http.cookie; pcre:"/^[A-F0-9]{50,}$/"; http.header_names; content:"Date"; content:"Connection"; content:"Pragma"; content:"Cache-Control"; reference:url,blog.jpcert.or.jp/2018/03/malware-tscooki-7aa0.html; classtype:command-and-control; sid:2026565; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_03_06, deployment Perimeter, malware_family TScookie, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_08_27;)