alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Octopus Malware CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?query="; fast_pattern; pcre:"/^\/[a-z]\.php\?query=[a-f0-9]{32}$/i"; http.request_body; content:"eyJpZCI6"; http.accept; content:"text/html,application/xhtml+xml,application/xml|3b|q=0.9,*/*|3b|q=0.8"; http.content_type; content:"multipart/form-data|3b|"; http.protocol; content:"HTTP/1.0"; reference:md5,1610cddb80d1be5d711feb46610f8a77; reference:md5,d8c8f2bf85796014feb06be41b99ca76; reference:url,securelist.com/octopus-infested-seas-of-central-asia/88200/; classtype:command-and-control; sid:2026544; 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 2024_04_05;)