alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET P2P Libtorrent User-Agent"; flow:to_server,established; http.user_agent; content:"libtorrent"; nocase; classtype:policy-violation; sid:2012390; rev:6; metadata:created_at 2011_02_27, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_14;)