alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING [TW] EvilProxy AiTM Microsoft HTTP HOST M1"; flow:established,to_server; http.host; content:"res-cdn-office-"; startswith; fast_pattern; pcre:"/[a-f0-9]{8}./R"; threshold:type limit, count 1, seconds 30, track by_src; classtype:social-engineering; sid:2037851; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_07_29, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_04;)