alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Fodcha Bot CnC Heartbeat Response"; flow:established,to_server; dsize:5; content:"|70 00 00 8f ff|"; fast_pattern; reference:url,blog.netlab.360.com/fodcha-a-new-ddos-botnet/; classtype:command-and-control; sid:2035941; rev:2; metadata:created_at 2022_04_13, malware_family Fodcha, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_14;)