alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Downloader.small Generic Checkin"; flow:established,to_server; http.uri; content:"/install.asp?mac="; http.user_agent; content:"MyAgent"; startswith; classtype:command-and-control; sid:2012541; rev:3; metadata:created_at 2011_03_22, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_06;)