ET MALWARE Sage Ransomware Checkin Primer

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Sage Ransomware Checkin Primer";
    flow:established,to_server;
    urilen:1;
    flowbits:set,ET.Sage.Primer;
    flowbits:noalert;
    http.start;
    content:"POST / HTTP/1.1|0d 0a|Host|3a|"; fast_pattern;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    content:!"Cookie|0d 0a|";
    content:!"Content-Type|0d 0a|";
    http.request_body;
    pcre:"/^.{0,15}[\x00-\x09\x80-\xff]/s";
    reference:url,isc.sans.edu/forums/diary/Sage+20+Ransomware/21959;
    classtype:command-and-control;
    sid:2023766; rev:7;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_25, deployment Perimeter, malware_family Ransomware, malware_family Sage, performance_impact Moderate, confidence High, signature_severity Major, tag Ransomware, updated_at 2024_05_29, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)