alert tcp $EXTERNAL_NET any -> $HOME_NET 1024: (msg:"ET DELETED Yoyo-DDoS Bot Command from CnC Server"; flow:established,from_server; dsize:124; content:"|C1 00 00 00|"; nocase; depth:4; reference:url,asert.arbornetworks.com/2010/08/yoyoddos-a-new-family-of-ddos-bots/; classtype:command-and-control; sid:2011401; rev:1; metadata:created_at 2010_09_28, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)