alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Plead TSCookie CnC Checkin M4"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".jsp?m="; startswith; pcre:"/^[A-F0-9]+$/R"; http.user_agent; content:"Mozilla/4.0|20 28|compatible|3b 20|MSIE|20|8.0|3b 20|Win32|29|"; fast_pattern; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,13}[^\x20-\x7e\r\n]/si"; http.accept; content:"*/*"; http.header_names; content:!"Referer"; reference:url,blogs.jpcert.or.jp/en/2019/09/tscookie-loader.html; classtype:command-and-control; sid:2028602; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_09_18, deployment Perimeter, malware_family TScookie, performance_impact Low, confidence High, signature_severity Major, tag BlackTech, tag Plead, updated_at 2020_09_02;)