alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY fetch User Agent"; flow:established,to_server; content:"fetch"; nocase; http_user_agent; reference:url,gobsd.com/code/freebsd/lib/libfetch; classtype:attempted-recon; sid:2002826; rev:11; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)