alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT Fake Virus Phone Scam Landing Oct 19 M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".html?a="; fast_pattern; content:"&clickid=w"; distance:0; pcre:"/&clickid=w[A-Z0-9]{23}$/"; classtype:social-engineering; sid:2021963; rev:4; metadata:created_at 2015_10_19, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_18;)