alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Downloader.VB.CEJ HTTP Checkin"; flow:established,to_server; content:"/down"; http_uri; content:"/down/?"; http_uri; content:"s="; http_uri; content:"&t="; http_uri; content:"&v="; http_uri; pcre:"/\/down\d+\/down\/\?s=[A-F0-9]+\&t=\d+\/\d+\/20/U"; classtype:command-and-control; sid:2008087; rev:5; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)