ET MALWARE Go/Hack Browser Data Exfil Attempt

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Go/Hack Browser Data Exfil Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.user_agent;
    content:"Go-http-client/"; startswith;
    http.content_type;
    content:"multipart/form-data|3b 20|boundary="; bsize:90;
    pcre:"/^multipart/form-data\x3b\x20boundary=[a-f0-9]{60}$/";
    http.request_body;
    content:"name|3d 22|file|22 3b 20|filename|3d 22|";
    content:"_=_"; distance:0; fast_pattern;
    content:"_=_"; distance:0;
    content:"_=_"; distance:0;
    content:"_=_"; distance:0;
    content:".json|22 0d 0a|"; distance:0;
    reference:md5,4a13256c1c9701146ad9ce6682b1a12e;
    classtype:command-and-control;
    sid:2033899; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_09_03, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_03;
)