ET MALWARE Mermaid Ransomware Variant CnC Activity M4

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Mermaid Ransomware Variant CnC Activity M4";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"=ID|3a 20|";
    content:"|20 20|Key1|3a 20 20|";
    content:"|20 20|Key2|3a 20 20|"; fast_pattern;
    http.user_agent; bsize:38;
    content:"Mozilla/3.0 (compatible|3b 20|Indy Library)";
    http.header_names;
    content:!"Referer";
    reference:md5,fc78e6e58352151fb77a4b92f239d381;
    classtype:command-and-control;
    sid:2029496; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_19, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_19, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)