ET MALWARE Asylum Ambuscade Related CnC Activity (GET) M2

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Asylum Ambuscade Related CnC Activity (GET) M2";
    flow:established,to_server;
    urilen:5;
    http.method;
    content:"GET";
    http.uri;
    content:"|2f 3f|www";
    http.user_agent;
    content:"Mozilla|2f|5|2e|0|20 28|Windows|3b 20|U|3b 20|Windows|20|NT|20|10|2e|0|29 20|http|2f|2|2e|8|2e|11|20|Tcl|2f|8|2e|6|2e|7"; bsize:63; fast_pattern;
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.connection;
    content:"close";
    http.accept;
    content:"|2a 2f 2a|";
    http.accept_enc;
    content:"gzip|2c|deflate|2c|compress";
    reference:url,welivesecurity.com/2023/06/08/asylum-ambuscade-crimeware-or-cyberespionage/;
    reference:url,proofpoint.com/us/blog/threat-insight/asylum-ambuscade-state-actor-uses-compromised-private-ukrainian-military-emails;
    classtype:trojan-activity;
    sid:2046244; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_13, deployment Perimeter, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_13;
)