alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET ADWARE_PUP LNKR landing page (possible compromised site) M5"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"/code?id="; fast_pattern; content:"subid="; distance:3; within:19; reference:url,securitytrails.com/blog/lnkr-malicious-browser-extension; classtype:pup-activity; sid:2027429; rev:5; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_06_03, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, updated_at 2020_10_30;)