alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Python-urllib/ Suspicious User Agent"; flow:established,to_server; http.user_agent; content:"Python-urllib/"; nocase; depth:14; http.host; content:!"dropbox.com"; endswith; content:!"downloads.ironport.com"; endswith; content:!".ubuntu.com"; endswith; reference:url,www.useragentstring.com/pages/useragentstring.php; classtype:attempted-recon; sid:2013031; rev:9; metadata:created_at 2011_06_14, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)