ET MALWARE Asylum Ambuscade Related CnC Activity (GET) M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Asylum Ambuscade Related CnC Activity (GET) M1";
    flow:established,to_server;
    urilen:15;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/^\/(?:[0-9]{10})\x2dds2$/";
    content:"-ds2"; endswith; fast_pattern;
    http.user_agent;
    content:"AutoHotkey"; bsize:10;
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.header;
    content:"Cache-Control: no-cache|0d 0a|";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; bsize:37;
    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:2046243; 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 Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_13;
)