alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Successful LinkedIn Phish 2015-09-17"; flow:to_server,established; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"a="; depth:2; nocase; content:"&Action.CorpUser.Signon="; fast_pattern; nocase; distance:0; content:"&CorporateSignonAccessChannel="; nocase; distance:0; content:"&UserType="; nocase; distance:0; classtype:credential-theft; sid:2031831; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_09_16, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2020_09_17, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)