alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY APT User-Agent to BackTrack Repository"; flow:established,to_server; http.user_agent; content:"Ubuntu APT-HTTP|2F|"; startswith; http.host; content:"repository.backtrack-linux.org"; within:40; reference:url,www.backtrack-linux.org; classtype:targeted-activity; sid:2013914; rev:6; metadata:created_at 2011_11_16, deprecation_reason Relevance, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_09;)