alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Zebrocy Implant CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"ID="; startswith; content:"&Disks="; content:"&Files="; content:"&Proc_list="; fast_pattern; http.content_type; content:"|3b 20|charset=65001|20 28|UTF-8|29|"; reference:url,meltx0r.github.io/tech/2019/10/24/apt28.html; classtype:command-and-control; sid:2028906; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_25, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Zebrocy, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_16;)