alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET PHISHING Microsoft Account Login Hosted on Firebasestorage"; flow:established,to_client; http.header; content:"X-GUploader-UploadID|3a 20|"; content:"|0d 0a|x-goog-"; file.data; content:"<title>Sign in to your Microsoft account</title>"; fast_pattern; classtype:social-engineering; sid:2031006; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_10_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_13;)