ET MALWARE Kraken Ransomware End Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Kraken Ransomware End Activity";
    flow:established,to_server;
    http.uri;
    content:!".";
    content:!"&";
    content:!"?";
    http.user_agent;
    content:"-"; offset:2; depth:1;
    content:"|3a|End"; distance:0; fast_pattern;
    pcre:"/^[A-Z]{2}-[0-9]{1,5}\x3aEnd(?:\x3a[0-9]{1,5})?$/";
    http.header_names;
    content:!"Accept";
    content:!"Referer";
    reference:md5,09d3bd874d9a303771c89385d938c430;
    classtype:trojan-activity;
    sid:2026473; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_11, deployment Perimeter, malware_family Kraken_Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)