alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY File Downloaded from Discord"; flow:established,to_server; http.method; content:"GET"; http.host; content:".discordapp.com"; endswith; http.uri; content:"/attachments/"; startswith; fast_pattern; pcre:"/^[0-9]{18}\/[0-9]{18}\/[a-zA-Z0-9]{5,7}$/R"; reference:md5,1ef671ebe0e5efd44cf05c630fbe9cb5; classtype:policy-violation; sid:2031083; rev:4; metadata:attack_target Client_Endpoint, created_at 2020_10_22, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_25;)