alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Duqu 2.0 Request"; flow:established,to_server; http.start; content:"Cookie|3a 20|COUNTRY="; fast_pattern; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,www.symantec.com/connect/blogs/duqu-20-reemergence-aggressive-cyberespionage-threat; classtype:trojan-activity; sid:2021247; rev:5; metadata:created_at 2015_06_11, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_02;)