alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Kindle Fire Browser User-Agent Outbound"; flow:from_client,established; http.user_agent; content:"|3b 20|Silk/"; pcre:"/^\d+\.\d/R"; reference:url,www.amazon.com/gp/product/B0051VVOB2%23silk; classtype:policy-violation; sid:2014095; rev:5; metadata:created_at 2012_01_04, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_24;)