ET MALWARE Possible Gamaredon HEAD Request for .dot file on ddns.net

Query · suricata

http.method;
content:"HEAD";
http.uri;
content:".dot"; endswith;
http.user_agent;
content:"Microsoft Office"; fast_pattern;
http.host;
content:".ddns.net"; endswith;
Raw source ET MALWARE Possible Gamaredon HEAD Request for .dot file on ddns.net · 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 Possible Gamaredon HEAD Request for .dot file on ddns.net";
    http.method;
    content:"HEAD";
    http.uri;
    content:".dot"; endswith;
    http.user_agent;
    content:"Microsoft Office"; fast_pattern;
    http.host;
    content:".ddns.net"; endswith;
    reference:md5,dbf4f92852cdae17aa3f2b1234f0140e;
    reference:md5,b221647d110bd2be2c6e9c5d727ca8db;
    classtype:command-and-control;
    sid:2028967; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_26;
)

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