alert http1 $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Saturn Proxy Checkin Response"; flow:established,to_client; flowbits:isset,ET.saturn.checkin; http.stat_code; content:"200"; http.header; content:"Encryption|3a 20|on|0d 0a|"; fast_pattern; startswith; classtype:command-and-control; sid:2007752; rev:7; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2024_04_10;)