ET MALWARE Suspected Gamaredon Downloader Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri.raw;
content:"//autoindex.php"; endswith; fast_pattern;
http.host;
content:".ddns.net"; endswith;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Suspected Gamaredon Downloader Activity · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected Gamaredon Downloader Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri.raw;
    content:"//autoindex.php"; endswith; fast_pattern;
    http.host;
    content:".ddns.net"; endswith;
    http.header_names;
    content:!"Referer";
    reference:url,blog.yoroi.company/research/cyberwarfare-a-deep-dive-into-the-latest-gamaredon-espionage-campaign/;
    classtype:trojan-activity;
    sid:2029500; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2020_02_19, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_19;
)

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