alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Geodo Checkin"; flow:established,to_server; urilen:16<>20; http.method; content:"POST"; http.uri; content:"/"; offset:8; depth:2; content:"/"; offset:16; depth:3; pcre:"/^\/[a-f0-9]{7,8}\/[a-f0-9]{7,8}\/$/"; http.user_agent; content:"|20|MSIE|20|"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|accept-"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,fa50062b7763487b3dd6f9ed0a2f3549; reference:url,pastebin.com/qnLmpKuQ; classtype:command-and-control; sid:2018496; rev:12; metadata:created_at 2014_05_22, malware_family Win32_Geodo, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)