ET MALWARE FIN7 JSSLoader Variant Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/?id="; startswith; fast_pattern;
pcre:"/^[A-Z]{14}$/R";
http.header_names;
content:"|0d 0a|Host|0d 0a 0d 0a|"; bsize:10;
Raw source ET MALWARE FIN7 JSSLoader Variant 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE FIN7 JSSLoader Variant Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/?id="; startswith; fast_pattern;
    pcre:"/^[A-Z]{14}$/R";
    http.header_names;
    content:"|0d 0a|Host|0d 0a 0d 0a|"; bsize:10;
    reference:url,www.crowdstrike.com/blog/carbon-spider-embraces-big-game-hunting-part-1/;
    reference:md5,bf23c48d111f5a2d3169062428940b1c;
    classtype:trojan-activity;
    sid:2033889; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_09_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag FIN7, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_02;
)

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