alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Octopus Malware CnC Server Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?servers"; fast_pattern; endswith; pcre:"/^\/d[0-9]?\.php\?servers$/i"; http.accept; content:"text/html,application/xhtml+xml,application/xml|3b|q=0.9,*/*|3b|q=0.8"; http.header_names; content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a 0d 0a|"; depth:47; endswith; reference:md5,1610cddb80d1be5d711feb46610f8a77; reference:md5,d8c8f2bf85796014feb06be41b99ca76; reference:url,securelist.com/octopus-infested-seas-of-central-asia/88200/; classtype:command-and-control; sid:2026542; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_24, deployment Perimeter, confidence High, signature_severity Major, tag Octopus, updated_at 2020_09_16;)