alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Datper CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?"; content:"="; within:9; pcre:"/\.php\?[a-z]{3,8}=[a-f0-9]{16}[01][a-z]+$/i"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0) like Gecko"; fast_pattern; startswith; http.header_names; content:!"Referer|0d 0a|"; reference:md5,eae5b16bef5f7dc37909ec91367fa807; reference:url,blog.jpcert.or.jp/2017/08/detecting-datper-malware-from-proxy-logs.html; classtype:command-and-control; sid:2024601; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_08_22, deployment Perimeter, malware_family Datper, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_11;)