alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TrojanDownloader.Banload.XDL Checkin"; flow:to_server,established; http.method; content:"GET"; http.uri; content:"/okok/Notify.php"; fast_pattern; http.user_agent; content:"Mozilla/3.0 (compatible|3b 20|Indy Library)"; bsize:38; reference:md5,70adf5506c767590e11bdc473c91bb38; classtype:command-and-control; sid:2022754; rev:4; metadata:created_at 2016_04_22, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_06;)