alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET HUNTING Suspicious SMTP Settings in XLS - Possible Phishing Document"; flow:established,to_client; http.stat_code; content:"200"; http.content_type; content:"application/vnd.ms-excel"; startswith; file.data; content:"/configuration/sendusing"; nocase; fast_pattern; content:"/configuration/smtpserver"; nocase; distance:0; content:"/configuration/smtpauthenticate"; nocase; distance:0; content:"/configuration/sendusername"; nocase; distance:0; content:"/configuration/sendpassword"; nocase; distance:0; reference:md5,710ea2ed2c4aefe70bf082b06b82818a; reference:url,symantec.com/connect/blogs/malicious-macros-arrive-phishing-emails-steal-banking-information; classtype:social-engineering; sid:2022974; rev:3; metadata:attack_target Client_Endpoint, created_at 2016_07_18, deployment Perimeter, confidence Medium, signature_severity Critical, tag Phishing, updated_at 2024_03_01, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)