ET MALWARE MSIL/Unk.HT-Based Ransomware CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/Unk.HT-Based Ransomware CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php";
    http.request_body;
    content:"hostname=csharp-"; depth:16; fast_pattern;
    content:"&enckey="; distance:0;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Referer|0d 0a|";
    reference:md5,2aa11c090fd0737e52cd532418c1211e;
    classtype:command-and-control;
    sid:2024352; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_06, deployment Perimeter, malware_family Ransomware, malware_family Hidden_Tear, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_06, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)