alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN Medusa User-Agent"; flow:established,to_server; threshold:type limit, track by_src,count 1, seconds 60; http.user_agent; content:"Teh Forest Lobster"; fast_pattern; nocase; startswith; reference:url,www.foofus.net/~jmk/medusa/medusa.html; classtype:attempted-recon; sid:2011887; rev:4; metadata:created_at 2010_10_31, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_04;)