alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN ProxyReconBot CONNECT method to Mail"; flow:established,to_server; http.method; content:"CONNECT"; http.uri; content:"|3A|25"; fast_pattern; endswith; classtype:misc-attack; sid:2003869; rev:10; metadata:created_at 2010_07_30, performance_impact Moderate, confidence Medium, signature_severity Informational, updated_at 2024_04_11;)