alert http1 $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Yoyo-DDoS Bot HTTP Flood Attack Inbound"; flow:established,to_server; http.header; content:"|0d 0a|Accept-Encoding|3a 20|g|7b|ip|2c 20|deflate|0d 0a|"; http.connection; bsize:10; content:"Keep|2D|Alivf"; fast_pattern; threshold:type limit, count 5, seconds 60, track by_src; reference:url,asert.arbornetworks.com/2010/08/yoyoddos-a-new-family-of-ddos-bots/; classtype:denial-of-service; sid:2011402; rev:7; metadata:created_at 2010_09_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_09;)