alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible Red October proxy CnC 1"; flow:to_client,established; http.header; content:"ETag|3a 20 22|8c0bf6-ba-4b975a53906e4|22|"; classtype:command-and-control; sid:2016224; rev:4; metadata:created_at 2013_01_17, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_23;)