alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET MALWARE Keylogger.ane Checkin"; flow:established,to_server; content:"Secret Client|00 00 00|"; depth:18; classtype:command-and-control; sid:2008449; rev:2; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)