alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor Win32/Hupigon.CK Client Idle"; flow:to_server,established; content:"|00 00 00 02 00 00 00|"; offset:1; depth:7; fast_pattern; content:"|78 9c|"; distance:5; within:2; content:"|00 00|"; distance:3; within:2; content:"|00|"; distance:1; within:1; classtype:trojan-activity; sid:2014957; rev:1; metadata:created_at 2012_06_26, malware_family Win32_Hupigon_CK, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)