alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT Fake Virus Phone Scam Redirector Oct 19 M3"; flow:established,to_server; content:"GET"; http_method; content:"/eyJscCI6InRlc3Q"; depth:16; fast_pattern; http_uri; pcre:"/^\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\/$/U"; classtype:social-engineering; sid:2021974; rev:3; metadata:created_at 2015_10_20, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_16;)