alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN ProxyReconBot POST method to Mail"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"|3A|25"; fast_pattern; endswith; classtype:misc-attack; sid:2003870; rev:8; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2024_04_11;)