alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PseudoManuscrypt Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"p="; startswith; fast_pattern; pcre:"/^(?:[A-Za-z0-9@+/]{4})*(?:[A-Za-z0-9@+/]{2}==|[A-Za-z0-9@+/]{3}=|[A-Za-z0-9@+/]{4})$/R"; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.header_names; content:"|0d 0a|Accept|0d 0a|Content-Type|0d 0a|"; startswith; content:!"Referer|0d 0a|"; reference:md5,b9363486500e209c05f97330226bbf8a; classtype:trojan-activity; sid:2043997; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_01_26, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_26; target:src_ip;)