ET MALWARE HiddenTears Ransomware Activity (GET)

Query · suricata

flow:established,to_server;
urilen:13;
http.method;
content:"GET";
http.uri;
content:"/alertmsg.zip"; fast_pattern;
http.host;
content:".tk"; endswith;
http.header_names;
content:!"User-Agent";
content:!"Referer";
content:!"Accept";
Raw source ET MALWARE HiddenTears Ransomware Activity (GET) · Suricata
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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 HiddenTears Ransomware Activity (GET)";
    flow:established,to_server;
    urilen:13;
    http.method;
    content:"GET";
    http.uri;
    content:"/alertmsg.zip"; fast_pattern;
    http.host;
    content:".tk"; endswith;
    http.header_names;
    content:!"User-Agent";
    content:!"Referer";
    content:!"Accept";
    reference:md5,eabb920f75c2943113713849878a6dfb;
    reference:md5,28b0ef0c832916a852ddf0c3c5427be3;
    classtype:trojan-activity;
    sid:2032320; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_03_24, deployment Perimeter, malware_family Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_24, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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