alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Possible Discover Phishing Domain Feb 02 2017"; flow:established,to_server; threshold:type limit, count 1, track by_src, seconds 30; http.method; content:"GET"; http.header; content:!"autodiscover"; http.host; content:"discover.com"; fast_pattern; isdataat:20,relative; classtype:social-engineering; sid:2023819; rev:6; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_02_02, deployment Perimeter, confidence Medium, signature_severity Major, tag Phishing, updated_at 2024_03_07;)