alert tcp $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE Banker Trojan CnC Hello Command"; flow:established,to_server; dsize:12; content:"[S]hello["; depth:9; classtype:command-and-control; sid:2009863; rev:3; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)