alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Genome User-Agent (Http Down)"; flow:established,to_server; http.user_agent; content:"Http Down"; fast_pattern; startswith; reference:md5,479306863946029e545a4803b303d74c; classtype:trojan-activity; sid:2022654; rev:3; metadata:created_at 2016_03_24, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_29;)