alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP InstallCore Variant CnC Checkin"; flow:established,to_server; urilen:1; http.start; content:"POST|20|/|20|HTTP/1.1|0d 0a|Accept|3a 20 2a 2f 2a 0d 0a|Host|3a|"; fast_pattern; http.request_body; content:"|7c|"; depth:40; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\x7c/"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,42374945061c7941d6690793ae393d3a; classtype:pup-activity; sid:2024428; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_26, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2024_02_29;)