alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Agent.UOI CnC Checkin"; flow:established,to_server; http.request_line; content:"POST|20|/beacon.php|20|"; startswith; fast_pattern; http.request_body; content:"architecture="; startswith; content:"&hostname="; distance:0; content:"&os="; distance:0; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,74cf39a4148c88adfee9f0e02e03dc9e; classtype:command-and-control; sid:2037952; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_04, deployment Perimeter, malware_family Win32_Agent_UOI, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_04, reviewed_at 2025_01_06;)