alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Higaisa CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php"; endswith; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64|3b 20|rv|3a|13.0) Gecko/2010010"; depth:58; fast_pattern; pcre:"/^[A-F0-9]{8}$/Rsi"; http.header_names; content:!"Accept"; content:!"Referer"; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:md5,23a30f6afa17f971148d9e955f65ae98; classtype:command-and-control; sid:2029640; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_17, deployment Perimeter, malware_family Higasa, confidence High, signature_severity Major, updated_at 2020_03_17;)