alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Backdoor Win32/Hupigon.CK Server Idle"; flow:to_client,established; content:"|00 00 00 01 00 00 00|"; offset:1; depth:7; fast_pattern; content:"|78 9c|"; distance:5; within:2; content:"|00 00 1f 00 1f|"; distance:2; within:5; classtype:trojan-activity; sid:2014958; 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;)