alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Otwycal User-Agent (Downing)"; flow:to_server,established; http.user_agent; content:"Downing"; depth:7; endswith; classtype:trojan-activity; sid:2008159; rev:7; metadata:created_at 2010_07_30, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_16;)