ET MALWARE Win32/GandCrab Ransomware CnC Activity M2

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/GandCrab Ransomware CnC Activity M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    pcre:"/^\/[a-z]{3,20}(?:\?[a-z]{3,20}=[a-z]{0,10}&[a-z]{3,20}=[a-z]{0,10})?$/";
    http.user_agent;
    content:"Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64";
    http.host;
    pcre:"/\.(?:bit|coin|sex|com|gandcrab\d*)$/";
    http.request_body;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/si";
    http.content_len;
    byte_test:0,>,4000,0,string,dec;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a|Cache-Control|0d 0a 0d 0a|"; depth:67; fast_pattern;
    content:!"Accept";
    content:!"Referer";
    reference:md5,8b7d3093c477b2e99effde5065affbd5;
    classtype:command-and-control;
    sid:2025455; rev:7;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_03_06, deployment Perimeter, malware_family Win32_GandCrab, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_16, reviewed_at 2024_02_13, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)