alert http $EXTERNAL_NET any -> $HOME_NET 1025:5000 (msg:"ET MALWARE Possible Web-based DDoS-command being issued"; flow:established,from_server; content:"Server|3a| nginx/0."; offset:17; depth:19; content:"Content-Type|3a| text/html"; content:"|3a|80|3b|255.255.255.255"; fast_pattern; classtype:trojan-activity; sid:2003296; rev:6; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)