alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Ark Trader API Login (POST)"; flow:established,to_server; urilen:13; http.method; content:"POST"; http.uri; content:"/api/v1/login"; http.content_type; content:"application|2f|json|3b|"; startswith; http.connection; content:"Keep-Alive"; http.request_body; content:"|7b 22|username|22 3a 22|"; startswith; content:"|22 2c 22|password|22 3a 22|"; fast_pattern; content:"|22 7d|"; endswith; http.header_names; content:!"Referer"; threshold:type limit,track by_src,count 1,seconds 3600; classtype:misc-activity; sid:2046668; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_06_27, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_27;)