alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Backdoor.Dripion External IP Check"; flow:established,to_server; urilen:1; http.method; content:"GET"; http.uri; content:"/"; http.user_agent; content:"Mozilla/4.0"; bsize:11; http.host; content:"www.dawhois.com"; fast_pattern; bsize:15; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; reference:md5,e7205c0b80035b629d80b5e7aeff7b0e; reference:url,symantec.com/connect/blogs/taiwan-targeted-new-cyberespionage-back-door-trojan; classtype:external-ip-check; sid:2022688; rev:4; metadata:created_at 2016_03_30, malware_family Win32_Backdoor_Dripion, confidence High, signature_severity Major, updated_at 2020_10_06;)