alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT Fake Virus Phone Scam Landing Oct 19 M1"; flow:established,to_server; content:"GET"; http_method; content:".html?a="; http_uri; fast_pattern; content:"&clickid=w"; distance:0; http_uri; pcre:"/&clickid=w[A-Z0-9]{23}$/U"; classtype:social-engineering; sid:2021963; rev:3; metadata:created_at 2015_10_19, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_16;)