alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zebrocy Backdoor CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?"; http.user_agent; content:"Mozilla v5.1 (Windows NT 6.1|3b 20|rv|3a|6.0.1) Gecko/20100101 Firefox/6.0.1"; fast_pattern; http.host; pcre:"/^(?:\d{1,3}\.)\d{1,3}$/"; http.request_body; content:"%0D%0AHost%20Name|3a|"; reference:md5,961e79a33f432ea96d2c8bf9eb010006; classtype:command-and-control; sid:2026527; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_19, deployment Perimeter, confidence High, signature_severity Major, tag Zebrocy, updated_at 2024_03_07;)