ET MALWARE Kimsuky CSPY Downloader Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Kimsuky CSPY Downloader Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"dwn.php?van="; fast_pattern;
    pcre:"/^\d+$/R";
    http.header_names;
    content:"|0d 0a|Accept|0d 0a|Host|0d 0a|Accept-Encoding|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|"; startswith;
    reference:url,www.cybereason.com/blog/back-to-the-future-inside-the-kimsuky-kgh-spyware-suite;
    classtype:targeted-activity;
    sid:2031171; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_11_03, deployment Perimeter, malware_family KGH_Malware_Suite, confidence High, signature_severity Major, tag Kimsuky, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_03;
)