ET MALWARE MSIL/NewHT Ransomware CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/NewHT Ransomware CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?computerName="; fast_pattern;
    content:"&userName="; distance:0;
    content:"&key="; distance:0;
    content:"&id="; distance:0;
    content:"&time="; distance:0;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Referer|0d 0a|";
    reference:md5,2e0ebb7a21d16ab6fa908f74bee260d6;
    classtype:command-and-control;
    sid:2024280; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_05_05, deployment Perimeter, malware_family Ransomware, malware_family NewHT, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_05, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)