alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY PCHunter CnC activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/PCHunter_"; startswith; fast_pattern; content:"="; distance:0; pcre:"/[A-F0-9]{96}$/R"; reference:md5,987b65cd9b9f4e9a1afd8f8b48cf64a7; classtype:misc-activity; sid:2032946; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_12, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_12;)