alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Possible Successful Generic Phish (set) 2019-02-13"; flow:established,to_server; flowbits:set,ET.genericphish; flowbits:noalert; http.method; content:"POST"; http.request_body; content:"a="; startswith; nocase; content:"|25|40"; distance:0; content:"&b="; nocase; fast_pattern; distance:0; pcre:"/^a=[^\x25]+\x2540[^&]+&b=[^&]+/i"; classtype:credential-theft; sid:2026903; rev:4; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_02_13, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2024_04_13, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)