ET MALWARE Win32/Gamaredon CnC Activity (POST) M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Gamaredon CnC Activity (POST) M1";
    flow:to_server,established;
    http.method;
    content:"POST";
    http.uri;
    content:"?=Write";
    isdataat:!3,relative; fast_pattern;
    http.user_agent;
    content:"|3b 3b 2f 2e|";
    content:"|2f 2e|"; endswith;
    http.accept_lang;
    content:"ru|2d|RU|2c|ru|3b|q|3d|0|2e|8|2c|en|2d|US|3b|q|3d|0|2e|6|2c|en|3b|q|3d|0|2e|4"; bsize:35;
    reference:url,scpc.gov.ua/api/docs/19b0a96e-8c31-44bf-863e-cd3e0b651f22/19b0a96e-8c31-44bf-863e-cd3e0b651f22.pdf;
    reference:url,unit42.paloaltonetworks.com/trident-ursa/#post-126209-_kwk9f3k7n6vn;
    classtype:trojan-activity;
    sid:2044128; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_06, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_11, reviewed_at 2023_11_17;
)