alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Malicious iframe guessing router password 1"; flow:established,from_server; file_data; content:"dnsPrimary="; nocase; fast_pattern; content:"dnsSecondary="; nocase; content:"dnsDynamic="; nocase; content:"dnsconfig.cgi"; nocase; reference:url,securelist.com/blog/incidents/66358/web-based-attack-targeting-home-routers-the-brazilian-way/; classtype:attempted-user; sid:2019111; rev:4; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2014_09_04, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_10_08;)