alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win64/Agent.BP Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/hive_append.php?id="; startswith; fast_pattern; content:"&obj="; distance:0; content:"&user="; distance:0; http.header; content:"Full-FileName|3a 20|%66%69%6C%65"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,fc878529af50b87ce71c8c36959f542a; classtype:command-and-control; sid:2037053; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_21, deployment Perimeter, malware_family Win64_Agent_BP, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_21, reviewed_at 2025_01_06;)