alert http $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET INFO Empty POST with Terse Headers Over Non Standard Port"; flow:established,to_server; http.request_line; content:"POST / HTTP/1.1"; http.header_names; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a 0d 0a|"; bsize:26; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.content_len; byte_test:0,=,0,0,string,dec; reference:url,twitter.com/3xp0rtblog/status/1509267848958562305; reference:md5,52a46f058ec6b726fe2829a590a15155; classtype:bad-unknown; sid:2036225; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_04_14, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_14, reviewed_at 2023_09_01;)