alert http any any -> $HOME_NET any (msg:"ET EXPLOIT DNS Change Attempt (Unknown Device)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/advWAN.cgi"; startswith; http.request_body; content:"tAction=editApply"; content:"viewPage=multiWANCfg"; content:"action=edit"; content:"dns1="; content:"dns2="; reference:url,cujo.com/dns-hijacking-attacks-on-home-routers-in-brazil/; classtype:attempted-admin; sid:2031804; rev:1; metadata:affected_product Router, attack_target Networking_Equipment, created_at 2021_03_03, deployment Internal, performance_impact Low, confidence Medium, signature_severity Major, tag DNS_Hijack, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_03;)