alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor Win32/Hupigon.CK Client Checkin"; flow:to_server,established; content:"|00 00 00 18 01 00 00|"; offset:1; depth:7; fast_pattern; content:"|78 9c|"; distance:5; within:2; classtype:command-and-control; sid:2014955; rev:2; metadata:created_at 2012_06_25, malware_family Win32_Hupigon_CK, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)