alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED System.Poser HTTP Checkin"; flow:established,to_server; content:"/check.php?c="; nocase; http_uri; content:"&v="; nocase; http_uri; content:"User-Agent|3a| Microsoft BITS"; http_header; classtype:trojan-activity; sid:2008035; rev:7; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)