alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Icoo CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/tUrl.xml?num="; fast_pattern; http.accept_lang; content:"de-at"; startswith; reference:md5,1d2ddece4cd5cff3658c59e20d40dd8b; classtype:command-and-control; sid:2015019; rev:3; metadata:created_at 2012_07_04, signature_severity Major, updated_at 2024_02_29;)