alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected PrivateLoader Activity (POST)"; flow:established,to_server; urilen:<20; http.method; content:"POST"; http.uri; content:"/api/f"; startswith; fast_pattern; content:".php"; endswith; http.request_body; content:"data="; startswith; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,60de759615308e91b93a6a9e2123099c; reference:md5,7c265e37c82f68ad7ef9d6ca88d245af; reference:md5,7b81b2c0c7fec00ff9bdeae73d8b997e; classtype:trojan-activity; sid:2049837; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_12_26, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27; target:src_ip;)