alert http $HOME_NET any -> $EXTERNAL_NET 8080 (msg:"ET DELETED Unknown HTTP CnC Checkin"; flow:established,to_server; content:"POST"; http_method; content:".ru|3a|8080|0D 0A|"; http_header; fast_pattern; pcre:"/Host\x3a\s[a-z]{16}\.ru/H"; classtype:command-and-control; sid:2014221; rev:3; metadata:created_at 2012_02_13, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)