alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Winpcap Installation in Progress"; flow:established,to_server; http.uri; content:"/install/banner/"; nocase; pcre:"/\d/\d+.jpg/i"; http.user_agent; content:"NSISDL"; nocase; depth:6; http.host; content:"www.winpcap.org"; startswith; reference:url,www.winpcap.org; classtype:policy-violation; sid:2002866; rev:9; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_19;)