alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Banking Trojan HTTP Cookie"; flow:established,to_server; http.cookie; content:"tcpopunder"; fast_pattern; reference:url,www.secureworks.com/cyber-threat-intelligence/threats/updates-to-the-citadel-trojan/; classtype:trojan-activity; sid:2018119; rev:5; metadata:created_at 2014_02_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_05;)